I've successfully used a voltage monitor on my P1 and F550 and turned off the DJI battery monitor on those systems.
I'm talking about a failsafe voltage monitoring system and not so much the intelligent side of it.
If there was an actual alarm monitoring the voltage, it would be better than...
I'm well aware of how these batteries work and was ready to pull the testing at 12v (3v/cell).
I'm suggesting that maybe the meter needs time to respond accordingly to the voltages.
I did a drain test on one of my batteries and found the pack will turn off at 12.2v (3.05v/cell).
Under no load the batteries voltage is going to be higher than it's actual voltage. Maybe it'll pay to hover a few feet for a short time and let the battery/meter stabilise.
According to the DJI website both chargers should be at approx. 17.4v
So according to my calculations, the 100w should deliver 5.7amps and the 57w should deliver 3.3amps
The battery is 4480mAh. The 100w charger can supply enough current to charge at 1C, the 57w charger is just over half that.
That is why the charging times vary.
The internal circuitry of the battery pack would control the charging current etc.
If you can supply enough amperage to avoid the voltage from being pulled down, you will be ok.
I just tested the battery pack cutoff voltage.
current at approx 5.5amps
The battery pack switches itself off at 12.2v (3.05v/cell).
For years I've been told that 3v is the minimum voltage per cell with LiPo's, so I would say 8% should be fine (very close to 3.8v)
By looking at the picture posted, I would say the IC has an internal fault and is the cause of the heat.
Unfortunately the numbers of the IC aren't clear, but I'd replace the IC anyway and try charging the battery again.
Unless you want to avoid the situations where the motor has ripped away from the arm.
The reinforcements may not stop the cracks, but they will help hold the arms together at their mounting points.
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