XIAOMI PRO2 Battery - Repair 1 [Teardown & Cell Swap]

[@benhonna]

I commend you for seeing it through, this looked like a pain… also the rotating scooter interludes were a nice touch. 😂

[@Darieee]

aye - I'm glad someone enjoyed my transitions ❤️ hope you're well man 🤘🤘

[@ghitsbatou]

man this is struggle. You are a hero doing it

[@FabienLahaille]

Excellent tutorial thanks. I still had some trouble lately with the very last strip I welded for the main connection (the one you bend and hard weld after putting back the cell in place). My spot welder was calibrated as for the first strips but this time the contact wasn't fair enough so it did the same wide red circle as you. I was not as lucky tho since it ignited the plastic membrane of the battery beneath it and I freaked out as you can imagine :) luckily I was able to stop the wild freaking show. My battery is still good (lost a bit of voltage in the flames but I'll replace it to compensate the peace of mind I lost with the melted plastic. Sadly I need to repeat the operation, and my cell is second first so wish me luck...

[@daand12]

Next time charge the low bank back to 4.15v to match the rest. Mine also have cfw with external battery to keep the battery low on the internal battery. Bank 1 on mine is always behind after a full charge way up to 41.95v using a AliExpress charger using a XT60 bypass plug. All cells at 4.20-4.22v when bank 1 is at 4.17v

[@steebbo9460]

How can I add a different bms I have a 30 amp bms I want to put on it

[@wettuga2762]

Awesome detailed tutorial, even though I wouldn't dare messing around with batteries, it's still nice to see someone solving these kind of problems. My Pro 2 tail light stopped working, and I noticed the cable comes directly from the battery and is only outputting 0.85v. Could it be the controller inside the battery, or other component outside of it telling the battery to output the wrong voltage?

[@Darieee]

the battery just passes that wire right through maybe you have some corrosion on the BMS connector (the one that plugs into the ESC)

[@ivannpatras363]

HY! What kind of transparent silicone sealant did you use in the syringe, can you please give me a link to where you bought it? Thank

[@yahnsolo]

Very nice video, as usual! Thank you for sharing

[@Darieee]

glad people are enjoying them 🤘 thanks for the kind words

[@Darieee]

2nd intervention: kzbin.info/www/bejne/mZ-8iYxtfppljJY 3rd intervention: kzbin.info/www/bejne/opi5qaSXhMx3h8U

[@spazmochad]

Don't suppose you have a link to the spot welder and lipo battery charger/discharger/tester I see you using in your videos?

[@Darieee]

I even made a video on it 🤘 kzbin.info/www/bejne/lZWvaZt5gqihors

[@MLS.22]

I have the same battery the BSM shows completely different voltage compared to the multimeter says, multimeter show all the value but BSM show cell one 3.2V and cell two 3.8V and the rest 3.6V

[@xgrapher]

is it safe to use a heat gun around the silicon area to let loose? I usually do that but don't know if its dangerous on battery stuff or not

[@Darieee]

hmmm, I doubt heat does anything much to the silicone .. alcohol also doesn't work I'd stay on the safe side and try replacing as much of the heat with careful prying and cutting as possible

[@xgrapher]

@@Darieee what are your doubts based on? I've been doing that with great success. I'm not looking for "i'd do this or do that" I'm looking for someone who has applied heat and the outcome was good or bad. guessing around doesn't do no good for me, I could make my own guesses. I'm looking for people who can share their experience. sometimes when you don't have an answer you can refrain from giving an answer

[@Darieee]

ooooor, and here's a soper crazy thought experiment we can both exchange the entirety of the ideas floating in our heads share our model's parameters with each other, and obtain a >= set of parameters for example I was going to ask what type of heat gave you results ? too hot to touch (i.e. 50+ celsius) ?

[@eutavi]

Thank you for you video! It made me NOT open my battery for a peak inside :)) what software are you using to read cells voltages?

[@Darieee]

check the g30max LD battery too - you'll love it 🔥 m365 tools is the name of the app - unfortunately it's android only

[@CoolspotDSO]

i have a question what are the elements inside the original pro 2 battery?What manufacturer and model and are they same in all pro 2 batteries or they put different ones?I know about m365 LG , EVE and BAK but what about pro 2 what its inside the original baterries?

[@Darieee]

all the ones I've seen are packed with LG MH1 cells

[@CoolspotDSO]

@@Darieee thanks alot, do you think if i add a second original battery via Y cable will work out (the bmses wont do conflicts each other because both will be original) ? Just for more distance.Now i have custom 2nd battery 36v 12800mah added but i want to to change it with original pro 2 battery because i find em cheap.

[@shannonlebreton]

Hay bro can you make a video on what way too put the battery back I took mine apart and can't remember how too put it back Its the same as this battery

[@Darieee]

just don't wash it man ..

[@vcdroneGR]

What kind of little screws are down the scooter cover? Is that an allen or a torx (star style) screws and what size?

[@Darieee]

I think those are torx T8

[@vcdroneGR]

@@Darieee thank you🙏

[@vcdroneGR]

@@Darieee these are torx T10 eventually as I moved the undercover of the scooter 😉 before taking apart the battery inside for balancing the cells do you believe I might try to charge the battery just bypassing the BMS cable to the controller? Since I have an unbalanced cell pack (about 3,750v when fully charged) is it going to charge any further bypassing the BMS I wonder? Or other cell packs will charge upwards as well and that will press the battery in total?

[@Darieee]

@@vcdroneGR all the BMS work is done inside the battery - and no ballancing will occur without the BMS inside the battery ... unfortunately you'll have to open'er up and work on a per-bank basis to asses the situation do keep us updated with what you find in there though 😀, sounds interesting !

[@vcdroneGR]

@@Darieee OK I understand what you say. Since the BMS is inside the battery and connected with cells (the blue light is blinking even I disconnect the bms cable from controller) maybe if I disconnect the BMS ribbon cable from the banks inside the battery and then give a try to charge without BMS 🤔 but I don't know if the battery is charging then if it is designed to work only with BMS on it. Otherwise I will charge single cells separately with my imax hobby charger at 1s 4.2v max to align them with current voltage 😎

[@jameelahmed840]

If i take the metal casing off can i put the battery in a standard xioami 365

[@Darieee]

you can, but you'd have to find a way to hold it in snugly ✌️

[@Darieee]

I'm not sure it fits even with that metal casing off though ..

[@kenarf3332]

Dashboard?

[@Lil_CarCrash]

Thanks for this video, now I know I just have to buy a new scooter!

[@RMFUNTIK]

It's a pain in the ass to change them.. today did this job, but I didn't have any spot welder, had to manual solder everything...

[@eliasgus4035]

thank you...my pro 2 died recently too ;(

[@Darieee]

how ??

[@eliasgus4035]

@@Darieee 1 of 10 cells is dead. I need to replace it like you

[@Darieee]

pro2 ?? check my latest video on this (pro2 battery repair 2) and try charging that bank up first there might be a BMS fault killing these banks ...

[@SchwaboT5]

Holy shit. I hope nobody try the same after watching 🤦‍♂️🤦‍♂️. Please just do those Things with enough know how

[@Sellutin]

My battery case end part was fucking glued and everything to its place bonus the screws.

[@zmafia666564]

Круто

[@klaasj7808]

hmm were can i buy original battery, everywhere those aliexpress crap is for sale, i dont like those. as i dont like fake lithium ion batteries and i dont like my house to burn down. just my 2 cents

[@Darieee]

veeeery tough .. I managed to score an original 0 cycle one off my local ebay type website .. I still can't imagine how that battery came to exist .. but it's in my scooter and is working fine .. basically a newer used one would be your best bet - or contact your local xiaomi service to see if they'll sell you one

[@klaasj7808]

@@Darieee they dont i called the headquarters in my country. it comes down to just throw it away. i hate that spirit

[@Darieee]

@@klaasj7808 yeah .. that really sucks .. what country is it btw ? maybe you can coax the service people into selling you one ..

[@DenisBilurka]

Bro where can i order battery for my scooter? Im moving to canada and thing is i cant ship it with battery, so I thought about taking one out and buying new one there, but i cant find shit