Quote:
Originally Posted by reader8317028
Is it normal to not charge if there is still partial charge on the battery?
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It is for LiPoly.
There is a minimum voltage at which it's safe to charge. Electronics is supposed to disconnect at about 3.7V
Charger is supposed to disconnect at about 4.2V, so you could measure 2.5V on a cell and it will never try to charge.
Many cells have a PCB with a controller built in. If the original had that, then the replacement needs one. If there was no built in controller then a cell should be identical.
They are the most tricky rechargeable technology.
Unless it's strange, the only absolute requirement of a charger is the voltage. 5V now and 5.2V on really old things. Even a 20A charger will still only charge at 500mA maximum if that's what the gadget takes. Only newer things take more than 500mA (1/2A). Also charge will be less at the start and end in most cases.
There is no ongoing trickle charge with LiPoly, that would set them on fire.