Battery mod thread

[cruzroy]

Has anyone tried the TRB-2300 tool to remove DJI's battery bricking "feature"?

TRB-2300 | Battery repairement

yes

 

[mavicpi314]

Has anyone tried the TRB-2300 tool to remove DJI's battery bricking "feature"?

TRB-2300 | Battery repairement

DJI Battery Killer works as well. I replaced the standard cells on a locked bms with Samsung 30q's and did some tests with 35e's. The 35e's got a little too hot (63C) for my liking at the end, so I've stuck with the 30Q's. I believe I got around 34:30 on 35E's landing at 3.1 volts.

30q -first flight hover test

00:00 - ~4.16 - 29c
25:40 - 3.43v
27:26 - 3.39v - 51c
28:35 - 3.36v - 52c
29:00 - 3.34v
30:00 - 3.31
30:40 - 3.27v
31:00 - 3.25v
31:30 - 3.22v
32:00 - 3.18v - around where stock battery parameters force a landing
32:30 - 3.14v
33:00 - 3.09v
33:30 - 3.04v
34:00 - 2.98v
34:30 - 2.93v
35:00 - 2.86v
35:30 - 2.77v -59c
35:41 - 2.73v

 

[Slawaw]

Which device is used in the Mavic mini battery? Is it one of those two?

The fault conditions are well known and documented- no question there.

I thought you may have specific knowledge. We all can guess.

The reality probably is that the battery can’t be fixed by an end user once bricked even with hardware. The SOC will be locked in manufacture.

The Mini 2, Mini 1, Air1 and Air2, M2R, M3 batteries use the bq9003 (bq40z307) chip. The blocking is perfectly removed, the parameters and limits of charge and discharge are changed. What's the question?

 

[timc995]

A bit off topic but I need help, I currently doubled the battery of my Mavic 2 Pro. I found the battery cannot be fully charge up, can anyone tell me which battery parameters will need to be changed, what shall be the new set value. I can access to parameter with CP2112.

Interesting. I unfortunately don't have an answer for you. That sounds like the BMS must be cutting out after some kind of charge limit. You can of course charge the batteries directly (without the BMS), but I'd wonder if there is a similar discharge limit.

 

[Slawaw]

BMS must be cutting out after some kind of charge limit

No. BMS on the original factory firmware charges up to 4.35-4.4 volts per cell. I increased the battery capacity many times and charged with the original charger to these values.

 

[timc995]

No. BMS on the original factory firmware charges up to 4.35-4.4 volts per cell. I increased the battery capacity many times and charged with the original charger to these values.

@alexfan - What are the symptoms you are seeing that lead you to the conclusion that it isn't fully charging? If you are referring to flight time -- then it is normal to see no increased flight time reported, since the drone doesn't know you have increased capacity. You will be able to fly longer, but you'll have to monitor battery voltages and can't rely on the drone's battery warnings.

 

[SPIDER23]

Good news
Finally, I own a magic board. I’ve done a cold swap on a un-updated and activated battery. For swap, I’ve followed the instructions by Everbit and Justinwidebody. Thanks a lot View attachment 89123

How to build like that?? Please help me... I want build for my mavic air. Seen this video the bms never lock... I copy the circuit diagram he put 10k resistor but how it work? Please help me. Thanks