Glad to help

Thanks for watching!

@@chichovenci Please help me 😥

*What nominal cell volt is roborock using ? 3.6 x 4 = 14.4v right? Charged - 4.2 x 4 = 16.8v *wont the ID on the BMS brick itself when you tear down? I haven't that issue. (only blown fuse) *Does anyone know what max amp The board can handle? In my opinion around 5A *Can I use more batteries in paralell? There no room for more batteries if idea is get more capacity use cells with high capacity * I suppose other BMS boards cant be used when they lack ID/T support No idea I've haven't tried .

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.

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

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

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).

@@chichovenci How much you paid for everything ?

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

@@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.

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

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.

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?

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

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

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 ...

kzfaq.info/get/bejne/mtqXosakusvHeJs.htmlsi=ZiXmMXSVzh9-u9b1

Check the fuse

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....

@@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 ???

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

@@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!

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.

@@chichovenci Thanks I will check and let you know

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

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

@@chichovenci Thanks a lot

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.

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.

@@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?

@@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).

@@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.

Should work ...

Original cells are lgabb41865 2600 mah

Thank you very much

Please inform can I use higher mah cell?

I've already done this. 2600>2900 mah

Please inform 2900 mah model no. Thanks & regards.

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)).

check fuse placed in battery (12ah3)

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

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)

Waiting two months for it...

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

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

Thanks for the reply 👍

3400 Mah will work ?

If you replace all