Xiaomi vacuum cleaner battery repair/cells replacement

In this video I'm completely replacing battery elements with new, welding new batteries with higher capacity using my diy spot welder.
also you can see 3d model of battery case here www.thingiverse.com/thing:471...

[@patrick07]

Not new to soldering and dismantling stuff but I still learn a lot from your video. Good video tutorial.

[@chichovenci]

Glad to help

[@-Gunnarsson-]

Hello there I have a few urgent quesions. What nominal cell volt is roborock using ? 3.6 x 4 = 14.4v right? wont the ID on the BMS brick itself when you tear down? Does anyone know what max amp The board can handle? Can I use more batteries in paralell? I suppose other BMS boards cant be used when they lack ID/T support

[@AmirulRoslan-fv3fx]

Thanks. This is helpful!

[@EdilbertoAriasRolon]

great job and video. thanks. Greetings from Asunción Paraguay

[@chichovenci]

Thanks for watching!

[@androidmanager4654]

@@chichovenci Please help me 😥

[@saiteja6335]

Thank you for detailed explanation! However, when opening the battery case, the component(likely AO4447A) below Thermal fuse(Sefuse D6x) got damaged and lost connection to the circuit board. Can I solder it to the board once again? Or can I replace it? Can you please guide me what can I do further? Your 3d model of battery case attached is very helpful , Thank you!!!

[@chichovenci]

if fuse is "just unsoldered " ... check it with ohmmeter and if is still usable (operational) you can solder it to it's place. otherwise use compatible replacement.

[@s3rkanAGA]

Thank you for this informative video. I have s5 max and do you think a regular 4s 20A bms works insteadof the original battery pcb? I see there are 4 cables. Two are plus and minus but I couldn't know the two other white and yellow one.

[@chichovenci]

I'm not completely sure, but one of them should be battery temp ... but I haven't any idea about the other one. Try to repair the original board in my case, the issue was fuse located on the board. I've used fuse from donor board - laptop battery

[@chichovenci]

Keep in mind that video is not tutorial it's just for getting an idea what's inside the vacuum cleaner....

[@AliBaba-ll4gy]

Cool DIY replacement. Wouldn't it be easier to order a replacement pack, preferably from a longer-lasting robotcleaner like the 1T or 1S ? Those have a 5,2 Ah battery capacity in comparison to the mop with 3,2 Ah.

[@chichovenci]

Replacement battery from aliexpress would cost me way more than changing the cells, also lg cells in this battery pack aren't reliable enough (in my opinion).

[@AliBaba-ll4gy]

@@chichovenci How much you paid for everything ?

[@chichovenci]

price of 8 x NCR18650PF (depends of price you can get cells, nickel strips are cheap enough not to think about their price).

[@AliBaba-ll4gy]

@@chichovenci Interesting. Thanks for response. Found price per piece like 5,25€. So like 40€ for 8 pieces. Ordered an exchange battery with 5,6Ah for 46€ today. Ill be curios.

[@chichovenci]

In my case transport and taxes 20% plus customs commission management was the issue making overall price.

[@mattiaghitti3320]

I've changed the battery with a new one, but robot doesn' t turn on and at the base the battery % is stuck at 1%. Any ideas?

[@danielratiu4318]

Hello, what kind of soldering tool are you using? Do you have a video on how to build one?

[@chichovenci]

kzbin.info/www/bejne/mqXKoJapisqWfsksi=ZiXmMXSVzh9-u9b1

[@vampire_kiril]

amazing! im surprised theyve made it to be repairable where you can just change parts.

[@androidmanager4654]

hello, first of all, thank you very much for this informative video. I applied exactly what you said, I just changed two cells, but I can't get output from the battery, I changed the fuse from the old laptop batteries, but there is no voltage to the black and red ends of the cable. Where could the problem be? ?

[@chichovenci]

it las long time ago i don't remember very good scheme but... have you tested all cells in the end of the cells "pack" there should be some voltage 12 - 16. other in my mind is have you check the fuse before solder it to the board? and in most laptops fuse is with 4 legs have you check scheme before soldering the fuse....

[@androidmanager4654]

@@chichovenci I checked, it doesn't work what I did. There is 16v in the last cells, but there is no current in the black and red cable, zero voltage, I burned my hand while I was taking the battery from the motherboard with the motherboard turned on, suddenly a place got hot, then it never happened again I wonder a part of me burned burned a circuit ???

[@lgKrtpowa]

If the complete battery pack gives the correct voltage, but, through the connector that goes to the vacuum cleaner (4 pins), it only gives approximately 7v - 8 volts, what do you advise me to check? The cells have just been replaced, the vacuum cleaner only turns on if it is in the base to be charged and the batteries are 100% charged at 4.2v

[@chichovenci]

Check the fuse

[@lOogify]

So... did it work? Is the first vacuum of xiaomi, right? Im thinking on changing my 2S battery to increasy capacity, hopefully will be similar (and the BMS wont block itself after changing the cells :'D )

[@chichovenci]

it still works, 1st gen vacuum yes, i don't see reason to have any issues with your battery changing the cells.

[@lOogify]

@@chichovenci Had some unpleasing surprises in the past changing laptop batteries, it got block and even getting a new (unofficial) one wouldn't work.. but Xiaomi is no Asus ;) Thanks for the video and the info!

[@savvasgerolemou6938]

Hello can you help I replace the battery cells with now one . I read 16.4v from battery pack and from black and red cable 12v .my vacuum won't start

[@chichovenci]

I'm almost sure that you have issues with the fuse try to use lamp as load on black and red terminal if lamp won't light check the fuse I had the same issue.

[@savvasgerolemou6938]

@@chichovenci Thanks I will check and let you know

[@savvasgerolemou6938]

@@chichovenci I check with lamp no light. How I check the fuse?

[@chichovenci]

@@savvasgerolemou6938 6.16 from my video i had the same issue... and I used from old laptop battery.

[@savvasgerolemou6938]

@@chichovenci Thanks a lot

[@gparra99]

how did you remove this part from the battery case? to open the battery is ok, but I don't know how to remove this piece from the orange case to see the cells... I don't know if it has some glue, so I don't wanna just pull the piece out

[@chichovenci]

Orange part is insert on inner side of battery case there are pins holding the insert (this orange part with the charging board and batteries) most of cases on the bottom on battery case there is glue holding the cells. One way to disassemble this case is to cut the bottom corners of the case and to use screwdriver to prime cells, other is to disconnect the board from the cells and to remove board, afterwards to remove the orange insert and with pliers to remove cells (but careful not to damage the cells (always be careful with li ion batteries it can become dangerous)).

[@kemalettinbalahoroglu608]

Hi Sir, I would like to use 2800 mAh 5C lithiumion batterier (4s2p). is it convenient for xiaomi mi mop pro2+ robot?

[@chichovenci]

Should work ...

[@pelitt]

Hello, I opened the battery box, I disassembled the circuit board, I measured the batteries, the voltages are all the same 3.8v, but it cleans only 1 room, its charge runs out, its original battery of 4 years. What should I do, should I buy a battery?

[@chichovenci]

One way is to change the battery, other is to check if one of parallel cells is death. I had this issue, after disconnecting parallel cells I've found that only one was working.

[@pelitt]

Thanks This card will not crash when the battery is removed like laptop cards, right? It works when I put in new batteries. Do I need to buy a new card?

[@chichovenci]

In my other video where I'm changing the cells I had issues with battery output, after changing the fuse everything was ok everything is on the video

[@pelitt]

Thank you very much for your answer. Is it currently in use? Is there a problem? The video where you changed the fuse part was taken from far away, it is not clear

[@chichovenci]

Now with better cells robot has more range in apartment 60 sqm use about 10 % of charge. I know that video isn't clear enough ( issues with used camera and tripod ... long story) main is to get the idea that there is a fuse and if you have issue with voltage on battery terminals to know what to look for ...

[@JoeB69]

Hi. I have the Xiaomi 1c that has a 2600mah battery. The battery only lasts 10 minutes then its dead. So I ordered a 6500mah battery pack from the Roborock. So my issue is, when I plug the new 6500mah battery in, the machine doesn't turn on, but it still works fine with the old battery. The new 6500mah battery is also rated at 14.4 volts. Do you have any idea what could be the problem? Thanks, from South Africa.

[@chichovenci]

If you already tried to put vacuum on dock station to charge the battery, and nothing happened. My next though is check for fuse on battery bms board.

[@0-DTE]

I had the same issue. Probably the board inside the battery pack causing the issue. considering to replace the cells from the new battery pack with the original.

[@Evilfire177195]

@@0-DTE did it work sir? Do you manage to solve the problem? I had a same problem as mention above. Im still wondering since i bought the 6500mah battery but went i tested it and charge it using the dock. It charged. But when i try to start cleaning, it automatically died. Then I had to hold the turn on button to switch on but as soon as i release the button, it suddenly died. Btw i checked the battery voltage, it state that the voltage is 17.7v. any adviced?

[@nguyen_van_a]

@@Evilfire177195 17.7v, that's odd. The original pack is made of 4S2P 18650 lithium ion cells, so its nominal voltage is 3.7v*4 (14.8v), and its voltage at full charge is 4.2v*4 (16.8v).

[@Evilfire177195]

@@nguyen_van_a sorry for false information given before. Based on what you said is exactly the same with the battery i bought. But problem already solve. What did i do is by, disassemble the original battery pack. Using the original board with new battery pack. The board inside the new battery pack, maybe there is abit different compared than original board. It really solve my problem , but the space consume inside the robot abit big, need to modified the body of new battery pack to be fit into it.

[@robertinocolo]

Ciao come mai io ho cambiato tutte le celle i volt sono giusti ma adesso rimane in carica e funziona tutto come parte il robot si spegne

[@chichovenci]

check fuse placed in battery (12ah3)

[@BaoNguyen-fz5rp]

@@chichovenci how to check the fuse is not working by digital mutimeter? Thank you!

[@chichovenci]

easiest way is to check for datasheet and measure resistance of it after defining fuse outputs other output is for heating element (proper way of measuring is after desoldering fuse)

[@-AishwaryaKadam]

Please inform rating of single cell.thanks & regards.

[@chichovenci]

Original cells are lgabb41865 2600 mah

[@-AishwaryaKadam]

Thank you very much

[@-AishwaryaKadam]

Please inform can I use higher mah cell?

[@chichovenci]

I've already done this. 2600>2900 mah

[@-AishwaryaKadam]

Please inform 2900 mah model no. Thanks & regards.

[@muhammadraza5931]

Please tell MAH per cell?

[@chichovenci]

Original cells are lgabb41865 2600 mah I've replaced all with Panasonic with 2900 mah not sure about exact model.

[@chichovenci]

In fact, in the video, there are subtitles, so you can see the exact model of used batteries.

[@muhammadraza5931]

Thanks for the reply 👍

[@muhammadraza5931]

3400 Mah will work ?

[@chichovenci]

If you replace all

[@1r3k1970]

A new battery from Ali costs $20. Is there any point in repairing it?

[@chichovenci]

Waiting two months for it...