Cordless Drill Conversion - With Laptop Batteries??

[@benwilliam1010]

finally, someone who knows what he is doing :)

[@tux008]

You bet 👍👍

[@billyveloz8230]

Totally agree. Ive seen a lot of magician KZbinrs tonight. Congratulations!

[@chinesestunna]

"I played with it for another hour and got bored, so I tied it up" - Great video and hilarious quote :)

[@Spartacusse]

Finally someone who isolates stuff! Thank You sir, you are doing a good service. Petty, many "exposed terminals" videos are more than 1 million views and this is not.

[@guruoo]

This is the most comprehensive presentation of a power tool battery conversion that I've seen so far.

[@ascari100]

I have seen every possible video on battery conversion for drills, and I must say your's is the best so far. Thank you for this long and informative video. I am in the process of bringing my hitachi impact driver back to life and this will help beautifully.

[@waltercooling8907]

Very comprehensive. Your clear instructive expressions were understandable. I often wondered about the purpose of BMS boards in reconstructed battery packs. The technical information made clear the inherent problems with Li- ion cells. Thanks.

[@steffenbuettner4294]

I’m glad you actually know what you are doing, unlike some other DIYers on KZbin. Also, you’re the first one that actually solders the cells quickly 😁. I use a DIY spotwelder, but I always see people mentioning that you shouldn’t sink much heat into the cells and then they proceed to solder on them for 5 seconds 🤦🏼‍♂️.

[@MrZeddy100]

THE BEST NICAD TO 18650 CONVERSION TUTORIAL VID ON THE NET!!! THANKS SORIN.

[@VitorMadeira]

Wo, wo, wo, woooo!!!! This is quite heavy duty super SPECIAL STUFF!!! This has got to be one of the best cordless drill battery conversion / repair I've ever seen here on KZbin. Thank you for this precious information. Greetings from Portugal.

[@domingoscastelhano1702]

Another great video .Finnally somebody makes the things properly ,preventing the "nerds" from beeing exposed to hiden dangers. Congratulations

[@bmck9097]

Thank you for taking the time to do this video. It's nice to watch someone that knows what he is doing.

[@sikedipuuhja7376]

excellent guide, clear and very easy to follow explanation. i really like how you explain the details and the limitations

[@damny0utoobe]

Very good. I like the fact that you mentioned the limitations of everything including the BMS. It saves a lot of trouble.

[@cri8tor]

Hey brother, you just got another subscriber. Really appreciate how you kept the music at a reasonable volume and gave a detailed account of every step you took in the process of your modification. Look forward to watching the next video on how to build a charging system that can deal with old 18650 batteries. Cheers

[@denzowat5583]

"now it have enough power to hurt my hand" 😂😂😂

[@alekpop1625]

Lorenz Balagtas c

[@alekpop1625]

Lorenz Balagtas j tray no power

[@PeteBasel]

Nice work, wow very detailed and covering all the bases!

[@Tomas_Prucha]

I must definitely say that it was the best drill conversion video I have ever seen on KZbin. Well done! 👍👍👍

[@simonm1447]

There are also shops which offer battery cases and PCBs for cordless tools which run already on LI-Ion batteries, for example the Makita LXT sytem. Combined with salvaged high current cells from tool batteries with broken PCBs (can also be packs from other brands) you can get extremely powerful packs, which are on the same high power level as the original battery packs. It is important to use high current cells in this case, because only them can deliver the currents tools like angle grinders or cordless chain saws need.

[@redzebra6688]

Sorin, you are definitely a genius!!! Subbed!

[@gs637]

Excellent done Sorine, bravo! And thanks, will use your tips very soon for my project. (

[@mrmanusia]

This video so helpful and the explanation is so clear, thank you

[@011obrad]

Thank you, Sorin. Very clear explanation.

[@malcolmoxley1274]

this is the best I have seen on you tube,well done

[@Harshasai-Foryou-telugu]

This is the video like that can help the world to build easier, i give one of d top 10 categories rank in youtube.

[@throne1001]

Hand down, best video for the drill conversion.

[@mohamedeltehewy7170]

Thanks pro , but we are need video about your soldering iron how you made it ?

[@yangyan6645]

At 14:57, 60% of voltage drop does NOT mean 60% of capacity. Voltage and capacity are non-linear relation. I have a question. You set the step-up output to 18V, but why it drops to 13.9 to 15.4V when you charging? It's a 2A step-up module, and should maintain around 18V when current less than 2A right?

[@Sorin_DIY]

60% it's an approximation, to make the explanation simpler. the voltage is dropping, partially because the step up converter efficiency decreases, when you increase the voltage. but mainly I think it has something to do with this type of BMS. I've used other BMS models and the voltage difference is not that big.

[@gmeister03]

This is the first video I’ve seen from you. Now I’m binging. Fantastic

[@rannyday2635]

I LOVE YOUR VIDEOS ! This is called that it does this and if you do this it will do that! short to the point no "unnecessary information " Just Well Done Videos keep up the good work Sorin! I can really learn from you!

[@WaveIO]

Bravo Sorin!

[@brianvo1437]

Very nice job Sorin! Explanation very clear. Thanks

[@sharukhanklesaria2365]

Super informative & clearly explained, lovely video bro! Thanks !

[@jayp775]

My friend this was very informative video, someone who knows what you doing keep up with good job.

[@f1mqjf1mqj19]

Nice summary of others videos, 1-But are you sure the BMS make the full charging process : Constant current until 4.2V/S, then Constant voltage untill current goes to 1/10th the charging current then stop charge ? Because for what i've seen these BMS are mainly made to avoid under and over voltage and disconnect the battery from charger or charge when it happens (needing to remove the charge or the battery to reset) 2-how and where do you set the charging current ? 3-what is the usage of the 2A step down converter you put in links

[@Sorin_DIY]

hi. in the BMS specifications it says CC/CV. when the battery pack is getting almost fully charged, the charging current decreases from 0.60A to 0.25A. so theoretically it should have some kind of CC/CV charging. to be sure, you need to connect a volt/ammeter to a single cell, and monitor the entire charging process. the charging current is set by the BMS. if you want to limit the current, you can use a step up/down converter with current limiting potentiometer, added to a 12V or 24V charger. if you don't have a 12V charger, you can use the standard power drill 24V charger + step down converter from the link.

[@stevenarango6319]

great video and even better explanation. you really know your stuff welldone

[@Талян-ж8д]

Bravo, bravo, bravo 👏👏👏👏👏

[@sammy2888]

Hi Sorin ,Thanks for this new project that i am waiting for a long time , gd to see u using a simple solder and much simple circuit to make it work like new.. tks pal

[@curiosity8435]

So, can I utilize an old laptop charger for this purpose? I assume I just need adjust the step-up/down converter to 18v. Correct? And, should I worry about overcharging if I leave the battery with charger on whole night? Thank you 😀

[@Sorin_DIY]

hi. you can use the laptop charger. but be careful if it has too much current, the converter and lithium cells may get very hot. the BMS board has overcharge protection, so you can leave it overnight.

[@infotec.4356]

You are always right

[@BrianHSC]

Nice tutorial. But often, it is those cheap BMS and controllers that goes out first. It is usually why laptop batteries are dead in the first place. Instead of soldering all the components in the battery, just extend the balancing cable out. You can make a small magnet door on the battery to hide it if you want to look neat. Then modify the charger to connect to balance charger like Tenergy or Imax B6. And just connect the balancing cable.

[@kadirmaran4087]

thanks for the video, but may I ask why you've set the charger at 18 Volts? nominal voltage of the drill (and original battery, also your new battery) is 14.4 volts and maximum voltage of your new battery is 16.8 volts. shouldn't it be 16.8 volts? thanks.

[@Sorin_DIY]

the BMS charging voltage needs to be 18V according to the specifications. it also works with 17V

[@Majestiicc12]

Thanks for the video! I am learning all of this stuff, its fascinating. In the video at 4:04, upper right of the screen is some sort of gel-looking stuff that you dip the solder into. What is it? I have seen many videos with it? Do I need something like that for soldering? Completely ignorant of all of this, sorry :(

[@Sorin_DIY]

hi. it's soldering rosin. it helps the solder bond with the surface.

[@alois17]

Hi Sorin. Just have seen your video. I am afraid of the switch you have used for the circuit. It looks so weak for the current of 10 A. What do you think?

[@Sorin_DIY]

hi. I think it was a 10A switch. it should be fine, because the switch doesn't start the motor. it just prepares the circuit to deliver current to the drill button.

[@eziusss]

If your drill 2x more powerfull just make 2x bigger battery. For example S4P4. I used 3S4P for my old makita drill with old laptop battery cells.

[@jgsmerda]

Awesome video, brother! Thank you kindly for your time and great info!

[@LaptopDisassembly]

Hello, i have a question. I will make same thing, but will use a charger from laptop. I can use 16V or 18,5V charger. What is the tolerance in the input voltage, and how can i limit the current if i don't use a DC-DC buck converter. Will the board limit current after going to 16.8V and will it stop charging. Thanks

[@Sorin_DIY]

hi. you need to give the charging board exactly the voltage it needs. the only option is to use the 18.5V charger, with a step down converter. you can use a converter with current limiting feature, like LED drivers. and set it to 16.8V and 1A. or you can buy a charger with 16.8V and 1A.

[@LaptopDisassembly]

@@Sorin_DIY I will try with 17V adapter, hope 0.2V will not be a problem. What is the logic with the charge. When the voltage go up to 16,8 V like the charger on, it stop charging or???

[@Sorin_DIY]

I think it will also work with 17V. all 4 cells (or pairs of cells) are charged in series with the voltage from the charger, let's say 16.8V. it will take each cell a different time to get fully charged. when the first cell gets charged to almost 4.2V, the balancing feature activates a resistor (load) on that cell. the load will draw a part of the charging current from that cell. so the charging level of the cell will be "paused", until the other cells also get to 4.2V. then, when all the cells get to 4.2V, the charging is stopped. but when you use old/salvaged cells, it's difficult to balance them.

[@LaptopDisassembly]

A few questions. I see the machine is 18V. You put 4 sells in series, which is 16,8V. The machine works, but with less power. When the battery is 16,8V why you are using 18V for charging. i try the same but with 4S 30A 14.8V-16.8V 4 Packs 18650 Li-ion BMS PCB W/Balance board. If i use your schematic the machine don't have power to spin at full speed. I reorganized the things , now it charges and works fine, but when i start drilling the voltmeter is turning of... but the drill still works. Probably i done something wrong, but will see it later.

[@Sorin_DIY]

my BMS board needs 18V, you can check the specs. you need to check the connections for the voltage indicator. you can disconnect the negative wire, to turn off the voltage indicator. you probably connected some wires incorrectly.

[@manickn6819]

Good video. I am dabbling a bit with old laptop batteries these days so this info is very useful to me right now. I figured quite a bit out so far but the amount of drifting surprised me.

[@nicugreu4935]

Salut,mersi pt.raspuns.Acumulatorii nu sunt buni pentu ca au amperajul mic,dar daca pun mai multi,doi cate doi ca si tine vor functiona?de exemlu zece bucati.

[@Sorin_DIY]

salut. tot nu cred ca sunt de ajuns. in primul rand trebuie sa verifici ce current maxim foloseste bormasina in sarcina. apoi trebuie sa calculezi nr de acumulatori care sa iti dea curentul acela. acumulatorii tai au rata de descarcare 1C. in unele laptopuri poti sa gasesti acumulatori mai buni samsung, panasonic, sony cu rata de descarcare 2C. daca pui 2 acumulatori de 2.6Ah in paralel la 1C, ai curent maxim de descarcare 2.6A * 1(C) * 2(paralel) = 5.2A. iti trebuie peste 10A.

[@AlizeuDev]

Faci o treaba grozava Sorin!

[@creeprovec718]

@Sorin Hi, I have the same problem with the powersupply. I have a portable compressor (I can not measure the resistance) the motor spec is 12V 120W. Will the 2 1ohm resistor work, or I should increase the resistance. Thanks.

[@Sorin_DIY]

hi. what exactly do you want to do? you want to convert it to a PC power supply?

[@rami939]

Hi Sorin . I have a an old Makita drill that has ni-cad batteries and doesn't work anymore( the batteries). I want to use with a cable attached to 2 power supply units,because where I live is hard to get imported items from abroad . One of the units shut down after some use . If I use 2 atx power supply units(computers) to get the 7.4 v that I need ,where do I have to connect the resistor you show in your video ,so the power keep working while I use the drill ? My Makita motor internal resistance when the motor is not running show 5 ohms ,and I have a 1W 10ohms resistor. Any advice will be greatly appreciated. Thanks.

[@Sorin_DIY]

hi. what's the original ni-cd battery voltage? you need a CC/CV converter, otherwise the drill will damage the power supply, or the power supply will shut down. because DC motors have a high inrush current, for you drill probably more than 10A. the resistor in series with the drill works only for testing. if you use it for long periods of time, the resistor will get very hot and probably burn.

[@rami939]

@@Sorin_DIY . Thanks for your answer Sorin . The original ni-cad batteries are 7.4 v-1500mAh . At the moment ,I'm using 2 atx power supply connected in series to get the voltage needed (5 v + 3.3 v) ,but one of them keeps shutting down after awhile . I can get 18650 batteries,but ,not sure about about the proper BMS . Maybe 2 connected in series(2 s)=7.4v 2200 mAh,or 4 connected in parallel (2 s)=7.4v 4400 mAh ,but first I'll look for the right bms . Thanks for the videos that you upload ,they're very useful . Cheers .

[@technicalempire7514]

GENIUS .

[@NeoGhk]

16.8V or even 14.4V, wouldn't that burn the 12V motor of the drill? I've seen videos where 3 batteries were used to supply 12V for a 12V drill not 6 batteries. Please explain.

[@Sorin_DIY]

This is an 18V drill. the original Ni-Cd battery has 18V nominal and maximum 21V, so the motor is fine. It's actually underpowered.

[@NeoGhk]

@@Sorin_DIY So for 12v nominal, what's the max number of batteries I can safely use.

[@Sorin_DIY]

You need 3 high drain li-ion cells with 10.8V nominal and 12.6V maximum. or you can buy a Li-po 3S battery, with max 4.35V per cell. this will have 11.4V nominal and 13.05V max, but it's more expensive.

[@ImranKhan-gz6gf]

And how about direct on adopter..? If we want to run dc 12v drill on direct charger so what value of charger we need i mean max current value and is it a good idea by the way..? Or is there any safe way to make it perfectly with the help of some component.

[@Sorin_DIY]

hi. it's difficult to convert it to an adapter. because it needs 10A or even more. you need a very powerful adapter and the power drill need a few modifications to decrease the inrush current. it's easier just to rebuild the battery pack with high drain cells.

[@zafka2]

As i can see your drill is 18V but you have used just 4 pairs of batteries (about 15volts) instead of 5 (18.5volts). Is it ok of using lower voltage for the drill?

[@Sorin_DIY]

hi. you are right, a 5S2P battery pack with 18V nominal and 21V max would be more suitable for this drill. but I wanted to test the drill with laptop batteries (which is not recommended). there is not enough room inside the battery case for 10 cells. only maximum 8 cell, so a 4S2P battery pack was the next doable battery pack. this has max 16.8V. there is a small difference in rotation speed, but li-ion cells are much better than the old unbalanced ni-cd cells. if you use high drain cells in this conversion, then it's just a 5S battery pack, there is enough room for 5 cells.

[@zafka2]

Just forgot to say that it is a great video as always

[@jppilot2003]

Thx for the information. Great explanation and video. I want to do the same to my old 18 volt drill. Could you please tell me which parts would I need for this project? It would be with a 5s BMS..

[@Sorin_DIY]

hi. you can use this type of BMS: www.aliexpress.com/item/21V-100A-BMS-5S-Polymer-Li-ion-Battery-Pack-Protection-Circuit-Module-PCM-18650-Li-POLYMER/32844842468.html?spm=a2g0s.8937460.0.0.7dee2e0eO2J0QY

[@mrmemoo4483]

u replace ni-ca by lithium ?? i cannot understand u put resistance

[@MustafaGARGI]

Hi. Thanks for the video. I replaced the old batteries with lithium ones. I just connected them as + to - and I can not charge the unit with the original charger. Why? Is the connection method problem?

[@rudolfzaris675]

Hi Sorin, I made similar modification like you, but my drill is stopping when accelerate. I used 3s 40a bms board and battery pack in 3s2p configuration. Dril is BOSCH GSR 9,6V VES-2. There was a small resistor on the battery + - connectors i cutt it out, but i think should stayed there...Thanks.

[@WildLifeBackyardCamera]

why do all love all ur videos ?? :) Thanks, thanks for sharing.Its really awesome :)

[@crteodor1698]

Great tutorial and extremely well explained but I have one question: why can't I use the old charger? In the end it is just a transformer that delivers a voltage and an amperage. I could use a voltage stabilizer if needed. Can you pleas explain this part as nobody on the whole internet (a little exaggerated maybe) is able to explain that

[@Sorin_DIY]

hi. the original drill charger has a different voltage than what the new BMS needs. but if you modify it or use a DC converter to stabilize the voltage, you can use the charger.

[@mrmemoo4483]

instead of adding resistance u may raise current to drill from ur power supply right? cause its original circuit do the same

[@Sorin_DIY]

the drill motor has a high inrush current. the power supply mistakes the inrush current for a short circuit and it shuts down. that's why it needs a resistor in series with the motor.

[@bartekd3577]

Jak użyje akumulatorków o zbliżonych parametrach to równo będą się ładować? Lepiej jak na filmie? (60 %)

[@electronic7979]

Excellent project 👍 👍

[@HayatoJin]

This video is beyond cool. I have a B&D screwdriver/drill with the same form-factor except 12V. If I wanted to give this a shot... What would you recommend, using a 4S battery and a step-down converter?

[@Sorin_DIY]

hi. a step down converter is not good for electric drills. because the electric motor will draw a high inrush current at startup, probably more than 10A and this is beyond most converters. you need high drain cells in a 3S configuration with a powerful BMS.

[@HayatoJin]

@@Sorin_DIY I see. I ordered a 3S 25A BMS and was planing to go 3S2P. Still deciding which batteries to use. What would you recommend? Between Samsung 30Q, Sony VTC6 and LG HE4? (or others if you can think of any). I don't know for sure any of these are original, I only have the store's word-of-mouth about them.

[@Sorin_DIY]

the brand and model are less important, they are all good cells. but you need to be sure, you don't buy fake cells. you should check the rating of the store and find products with a lot of orders and reviews. some people even post photos with the real capacity of the cells, tested with a good charger.

[@alexandrugheorghita9993]

@@Sorin_DIY Servus Sorin, can you indicate a good li-Ion/Li-Po/LiFePo accu to buy? Any experience with them? Any suggestions?

[@Kevin-gx8lc]

Wow! Really infomative and very useful. I've subscribed, thanks fior sharing Sorin. Greetings from Southport UK.

[@bekim137]

the most professional way to convert nicd to lithium battery

[@larrysmith3281]

Hi I built a circuit as per yours but used a different BMS and a 3S configuration. When I connect the monitor board I get a constant 3.5v at the two points for the drill powerwith the switch "off", would it help to connect the actual positve lead from the monitor to the BMS batt Positive and not leave it floating as per ur connections. if you wish to help could I send you the layout. Thanks

[@Sorin_DIY]

hi. I don't know what type of BMS and monitoring module you use. but if you disconnect the negative for both power drill and monitoring module, everything should shut down. you can use a switch with 2 poles, one for the drill and the other for the voltage monitoring. or you can use the switch only to turn off the voltage monitoring. the battery pack can remain connected to the drill, because the drill should not discharge the battery, when it's not used. only when you press the drill button.

[@danielp9721]

must admit he know what hes doing and whats what

[@jecabrera9198]

Can the wiring be modified so that instead of using a built-in BMS, the battery charger will be the DIY 18650 using the TP-4056 shown in your other video? I saw somewhere that BMS discharges the "overcharged" cells to balance the cells and the cycle tends to shorten the life of the cells in the long-run. I like the low voltage alarm feature and I wonder if the external charging is feasible. Could you see any drawback?

[@Sorin_DIY]

hi. you can use tp4056 modules to charge cells connected in parallel. but each charging modules need to have the input supply voltage separated from the others. you can make a transformer with multiple isolated outputs. the tp4056 module with protection can deliver an output current of max 3A, so it's not strong enough to protect the cells inside the drill battery pack. you need a protection board with more than 10-20A. you can use tp4056 module only to charge and balance the cells.

[@jecabrera9198]

@@Sorin_DIYHave you seen the new version of TP4056 with dual protection? Is it not enough?

[@Sorin_DIY]

not if you connect them in series.

[@jecabrera9198]

@@Sorin_DIY How about I wire the battery so that each cell or pair of cells will have a dedicated TP4056 outside the battery?

[@Valyoung1973]

Well done sorin

[@reidallaway]

10 out of 10! thanks for taking the time to put this all together. So much excellent detail and presented so clearly. Subbed

[@rameeskoya4180]

Im upto build a battery pack for my cordless drill.(drill has rs775 motor) Stock battery was 12v 1.5ah. Can i replace that with 3s2p pack with 10A BMS ?? How to choose the amps rating of bms ???

[@Sorin_DIY]

hi. the BMS board should handle more than 10A, probably 20A should be fine. the old battery was made with ni-dc cells? that means it has 12V nominal. you need to make a battery pack with high drain lithium cells. a 3S pack has 10.8V nominal. a 4s pack has 14.4V nominal, which is too high. so you need a 3S pack. 3S2P is better.

[@emersonsrandomvideos248]

Very nice project bro!! I'm learning.

[@011obrad]

Hi Sorin, Now I need to ask for your help. I have a Bosch Hammer GBH 24 VFR professional cordless drill and I'm tired of buying very expensive replacements batteries. Is there a 24V one on the market that I could use for my drill? Which one do you think would have sufficient Amp to power my drill? Thank you in advance.

[@011obrad]

To add to my question: I'm actually looking for a corded solution - switch from battery to a 24V ?A transformer/adapter for my drill. Thanks.

[@Sorin_DIY]

hi. this type of drills need a lot of power. I don't know what type of battery you can buy. if you want to build a battery pack, you should use good quality high drain cells with 25A or 30A like samsung. and a good 5S or 6S protection board with balancing feature. if you want to make it corded, you need a very powerful supply current. and a 24V with 25A or 30A power supply it's very expensive. you can just buy a new drill instead.. the cheapest way is with a transformer. it will not have all the power you need, the voltage may decrease, when the drill is in full load, but it will work. my next video will include a tutorial with a transformer.

[@011obrad]

@Sorin - DIY Electrical Nerd Thank you Sorin. I look forward to your next tutorial

[@011obrad]

@@Sorin_DIY Do you thing something like this would do the trick? To make it corded.

[@011obrad]

www.amazon.com/Voltage-Converter-DROK-Regulator-Transformer/dp/B076TTBKFG/ref=sr_1_2_sspa?keywords=24V+with+25A+or+30A+power+supply&qid=1547932354&sr=8-2-spons&psc=1

[@matyaslukacs3021]

De unde ai cumparat incarcatorul de acumlatori 18650?ce este numele lui si cat costa?? Multumesc.

[@Sorin_DIY]

salut. este vorba de opus bt-c3100 v2.2. www.aliexpress.com/item/2015-BT-C3100-V2-1-Digital-Intelligent-4-Slot-LCD-US-Plug-Battery-Charger-Compatible-with/32333901154.html?spm=2114.search0104.3.14.6e7c5c66oQIDrs&ws_ab_test=searchweb0_0,searchweb201602_3_10065_10068_319_317_10696_10084_453_454_10083_10618_10304_10307_10820_10821_10301_538_537_536_10059_10884_10887_100031_321_322_10103,searchweb201603_53,ppcSwitch_0&algo_expid=c91e201a-eb81-4106-a39c-b99f3c8a057d-2&algo_pvid=c91e201a-eb81-4106-a39c-b99f3c8a057d&transAbTest=ae803_3

[@hukkabukka]

Plz explain more, how did you bypass the overcurrent safety feature of diy power supply, am not able to do this for my induction heater.. Plz Sir EXPLAIN

[@Sorin_DIY]

hi. you can connect the load first, then turn on the power supply. in some cases it will work. if not, you need a inrush resistor in series with the load. in this video I use 2 power resistors of 1 ohm connected in parallel, to create a 0.5 ohm resistor. this will decrease the inrush current at startup.

[@hukkabukka]

@@Sorin_DIY but i have already used 470 ohm resistor to limit the voltage to gate of the mosfer, adding another resistor won't let the gate switch anymore. By far your videos and voice over is awesome.

[@DrZipZwan]

1:30 I experience the same issue with my DIY dremel, when I connected it to my ATX Lab Power Supply (thx, I used your "Gorgeous" ATX Lab Power Supply project). Additionaly, I added a XL6019 LM2596S (Amazing StepUp & StepDown Module) to get some variable feature other than 3.3v/5v/12v. Sometime I need less than 3v, to test 3mm Led for example. My DIY dremel is build with an old 555 motor, it was for a drill I guess. So alternative is to connect it to 5v, then step up voltage till reaching the speed desire! Thx for the explanation, why ATX is shutting down... I did not use the trick with dummy load as you cause I do not have access to a variety of those ceramic resistor. But after learning, how useful they are, I started to collect some of them... But wait , at the end you are charging the battery pack with an ordinary 12v charger! this white charger you are using is not for litium cells. What about when the battery are fully charged?? This charger will not cut off?? Is it not dangerous for the cells to be constantly chaged?? Because I learned that BMS is not actually a proper charging board, it is a protection DISCHARGING board!! yeah some BMS got over charge protection, but still they are not proper charging board for litium cells...

[@Sorin_DIY]

hi. it depends on the BMS board. if you have a CC/CV charger or converter + a good BMS board with balancing feature and decent voltage values for the overcharge protection and the other features, it should charge the li-ion cells good enough and not damage the cells. the charging modules for one cell (4.2V) are better, because they are more precise and it's easier to apply all the protection features to only one cell. it's difficult to do the same think with several cells in series.

[@DrZipZwan]

@@Sorin_DIY yes you are right, though, I think it is easier to use 12v charger for Lithium battery, like you used with your first Router UPS. kzbin.info/www/bejne/f52on3ikbNWno8Um54s You right it is much easier charging a single 18650, but when you switch to 2 or 3 especially in series, thats when things start to be tricky and complicated.

[@cbs1710]

14:40 - Was the video for balancing any old Li-Ion batteries released? If so, can anyone please link it or write the title. (KZbin search is ABHORRENT.)

[@csudri]

Hi Sorin, an absolut newbee without any soldering expreience can be capable to do it?

[@Sorin_DIY]

yes, but with a lot of patience and triple check all the connections before turning it on.

[@csudri]

Thank you for the fast answer! I found links only for 4 item, can you also include sources for the others? (Switch, warning display, etc.) If I wanna modify my battery exactly like yours, I will need them. :)

[@csudri]

I ordered these batteries: www.aliexpress.com/item/4000720869924.html My drill is a Skil F0152017AB with 14,4 battery.

[@csudri]

Or with a LiPro balance charger I can avoid all the electronics and I should only replace the cells?

[@Sorin_DIY]

these cells are not good for power tools. you need high drain cells with 30A output current. you can use only 4 cells. you need a good BMS board and a 16.8V charger. this BMS is good, 4S with balance: www.aliexpress.com/item/4000214801977.html?spm=2114.12010615.8148356.9.2734bb41BGtsOx

[@MrBrymstond]

You have batteries that will draw 10 amps, but the BMS is only rated for 8 amps?

[@Sorin_DIY]

hi. the BMS has a maximum continuous discharging current of 8A, but it can take a peak current draw of more than 10A for short periods of time. all these components, especially the laptop lithium cells, are pushed to the limit, because I wanted to explain how this conversion works and what the disadvantages are.

[@alekpop1625]

J sucsedeed to make finaly it need exetacly 12.6 v but when pusch gass at full atright direction sometmes just stol on left direction fork fine .why this do you know

[@txm100]

Hey, thanks for the video! Do yo have any recommendations for a BMS board for a 12V drill? Or would your link work too? Thank you very much!

[@Sorin_DIY]

hi. I suggest the 3S BMS 60A board with balance from this link: www.aliexpress.com/item/4000214801977.html?spm=a2g0s.9042311.0.0.27424c4d0pknhS

[@DrZipZwan]

@@Sorin_DIY hey that is the same I wanted to order, but got confused by "enhanced' model. Balanced is clear, it balance changing of all 18650 to 4.2v. But damn what about enhanced! Do you have any idea about it??

[@johnnyaquila]

Salut. Se poate transforma o autofiletanta cu acumulator in una cu alimentare pe fir ?

[@Sorin_DIY]

salut. da, dar iti trebuie un transformator puternic sau sursa in comutatie puternica.

[@johnnyaquila]

@@Sorin_DIY mai repede cred că le-aș schimba acumulatorii vechi cu niste 18650 . Sau mai repede cumpăr una nouă. E mai putina bătaie de cap.

[@1977macy]

Thank you !!!

[@rannyday2635]

Sorin I want to modify a battery pack so i can use it like AA batteries loading each 18650 separately and charged searately so that a bad 18650 would be no problem unlike a battery pack would be ?

[@Sorin_DIY]

yes you can use it like that. a BMS is still needed for the protection features. and very important, use high drain cells, not laptop cells.

[@rannyday2635]

sorin The bms is a battery changing pcb right? I will be charging them with a home 18650 battery charger individually. could the protection features be omitted from the drill?

[@siryoneyal]

Couple of questions. Can you post a link for the voltage with buzzer? You also posted a link for a step down converter. Why?

[@Sorin_DIY]

hi. the step down converter is for those who want to use the original cordless drill charger, instead of buying a new 12V universal charger. the drill original charger has 24V. so you can use the step down converter to drop the voltage down to 18V. I forgot to mention that in the clip.. and here is the link: www.banggood.com/Wholesale-1S-8S-Li-po-Battery-Voltage-Tester-Checker-Indicator-Monitor-Buzzer-Alarm-p-26049.html?rmmds=search&cur_warehouse=CN

[@hojustraper]

Hello Sorin, let me ask you something, i have done exactly what you did, but i have a different bms in comparisson with the one that you used.. It turns out that de internal resistance is 0,7 ohm and when i pull the trigger of the drill, it barely moves and turns off... how can i solve it without changing the bms? Can i add in a permanent way two 1ohm 20w resistors in parallel? in order to avoid the short circuit protection of the protection board? THANKS YOU! amazing Job. Guillermo from Argentina

[@Sorin_DIY]

hi. you can try first to add a big capacitor in parallel to the output wires, just before they enter the drill. you need a 24V and 4700uF (or bigger) capacitor. it will store some energy and maybe the voltage will not drop so much when you start the drill. if that is not enough, you can try to add the resistors (between the capacitor and the drill). but the resistors will get hot, when the drill is working in full load, so find a good spot to install them, not close to the battery. the drill will use more than 100W in full load, you need to use the drill with a lower torque level, to protect the 20W resistors.

[@hojustraper]

Thank you so much Sorin! I added 2 1 ohm 20 watts resistors in paralles among them and in series with the drill and works, but as you said they get really hot... I will try it as it is until i find a big capacitor. It is a pitty because this is my thurd conversion and i didnt have any problem with the previous two. Thank yoy again for your help! Keep on with your amazing videos!

[@HereToGreet]

Hi sir! I i watched your video and its very clear. But heres my problem sir. I have a 12 v drill and i am planning to upgrade my battery capacity so i bought 12pcs 3.7v 18650 1200mah 4.44wh and one pc. 4S40A. Can u tell me if its good or not?? Or can u give me any suggestions ?

[@Sorin_DIY]

hi. you need high drain cells for the power drill. can you give me the link for the lithium cells and the BMS board?

[@HereToGreet]

@@Sorin_DIY s.lazada.com.ph/s.17UyV

[@HereToGreet]

@@Sorin_DIY shopee.ph/product/284704736/4649061471?smtt=0.155921181-1609668888.9

[@Sorin_DIY]

I don't think the cells are good enough, there is nothing mentioned about the maximum current. you need high drain cells with a maximum current of 20-30A like these: www.aliexpress.com/item/32835679557.html?spm=a2g0s.9042311.0.0.27424c4dAlhiFT and that type of BMS board it's similar to a 25A older model, I don't think it can handle 40A. but even with 25A it should still work.

[@HereToGreet]

@@Sorin_DIY thank you so much sir and more power ♥️

[@renatoc.1235]

Can I use one 12v battery with one 18 v drill using one 'step up ' ? Thank you

[@Sorin_DIY]

no. the power drill needs 10 - 20A

[@renatoc.1235]

Sorin - DIY Electrical Nerd If I change the battery with model 18650 and use a step up for the charger that put out only 18,5 V. From 18,5 to 21 output. Thank you

[@onkarshikhare31]

Hello thanks for knowledge . I would like to set low alarm on my DIY 13s battery can I use 2 8s logger for low alarm or any other option Please guide.

[@Sorin_DIY]

hi. I never tried that. I think it will work with 2x 8S battery indicators. you need a 2 pole switch to turn it on. I don't know if there is another way, I never made a 13S battery pack.

[@onkarshikhare31]

@@Sorin_DIY Thanks

[@granpatriarca3726]

Excellent work. u have a new subscriber.

[@martontichi8611]

Thank you. I will use the same principle to rejuvenate my iRobot Roomba's NiMh battery. It is also 4s2p.

[@stevenA44]

I have a couple of cordless drills that I am going to try this with at some point. It sucks that the replacement batteries cost just as much as the drill was when it was new.

[@demonn-yx5eo]

Bro what kind of dremel is that I wanna buy one pleaseee reply😭😭

[@Sorin_DIY]

I bought it from a local store. I don't think you can find it online.

[@seenow8745]

hi want to ask you please can i use 1 resistance 1ohm 100w .how can i know the resistance i should use thank you

[@Sorin_DIY]

hi. I suggest you use 2 resistors like this in parallel, so you will have 0.5ohm. 1ohm will draw too much power.

[@lahiruwickramathilaka6817]

What camera are you using to film your videos?

[@Sorin_DIY]

hi. my phone camera...

[@lahiruwickramathilaka6817]

Superb, keep it up.

[@belalsmart7138]

New subscriber and I am going to watch all your videos...I like it

[@Yorumcu63]

Great video

[@cojanmihai5543]

Salutare. De ce mai trebuie sa folosesc convertorul daca am încărcător de 12 v? Încărcătorul este de laptop, nu ar trebui să aibă convertor? Mulțumesc

[@Sorin_DIY]

salut. depinde ce tensiune de incarcare foloseste modulul BMS. in cazul meu 18V. deci am nevoie de un convertor step-up sau step-down, pentru a modifica tensiunea alimentatorului la exact 18V. trebuie sa verifici ce tensiune are incarcatorul de laptop.

[@cojanmihai5543]

@@Sorin_DIY îți mulțumesc frumos. Eu nu le am cu electronica. Incerc sa fac o baterie de 12 v, pt o bormașină Bosch, din 3 baterii li-ion 18650. Am un încărcător de laptop de 12,22 v și 2A. Îți mulțumesc încă odată. Daca ai putea să îmi dai câteva sfaturi ar fi de mare ajutor. Îți doresc succes in tot ceea ce faci.

[@Sorin_DIY]

daca folosesti doar 3 celule, trebuie sa fie "high drain cells", adica sa produca 20-30A. cum sunt samsung INR18650. daca ai celule de laptop trebuie sa folosesti cel putin 6, cate 2 in paralel. acestea au doar 2-4A. altfel nu au destul curent, bormasina nu are putere, se vor incinge, pot chiar sa ia foc.

[@cojanmihai5543]

@@Sorin_DIY am făcut cum ai zis, am legat cate 2 in paralel, și apoi în serie(3 pachete a câte 2 baterii). Am pus BMS-ul și apoi l-am pus la încărcat cu încărcătorul de 12,2 v. A mers totul ok până aici. Dar când am pus bateria in bormașină și am apăsat pe buton se opreate. De ce? Nu ai bateriile destul amperej? Eu nu am încărcător de la opus.

[@Sorin_DIY]

ce modul BMS folosesti?