Re: charging failure
I posted this in another part of the forum, but it's probably worth repeating. A nano clone I recently repaired for a friend had the most minimal charging circuit imaginable, and in no way was it adequate to safely charge a LIPO cell.
I strongly suggest that you disconnect the charger as soon as the battery is charged, as there is no automatic cut off as such (at least not on the unit I was examining) and LIPO cells are well know for their exciting failure modes i.e. "vent with flame". The problem is made worse by the poor quality of many Chinese cells.
FWIW the problem with the unit unit I repaired might be the same as the one mentioned in this thread. There is a large cut out in the PCB to make space for the cell, and the small pcb section that remains is very flexible. One of the two charger components (a 1.5 Ohm 0805 surface mount resistor) had the silvering ripped off one end from the board flexing. Wiggling the USB connector would put enough charge in the battery for the unit to briefly wake up. I replaced the resistor and normal operation was restored.
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