Hello. I have a 3V, 1.3mAh li battery that I am attempting to charge. I initially placed a voltmeter across the battery and it read approximately 2.4V.
I attempted to charge it to its nominal voltage of 3V with a DC power supply (I know people don't recommend this, but I'm really just doing this to play around and am not leaving the battery unattended.) Supply was hooked in series with a resistor to the battery. Articles recommend a max charging current of approximately 0.7C, so I chose a max charging current of 1mA. I chose a charging voltage of 3.1V. So if I set my supply to 3.5V, I chose a resistor of (3.5-3.1)V / 1mA = 400ohms.
However, when I tried this, the battery barely drew any current, as read on an ammeter, and for the most part, the battery voltage stayed at 2.4V (I would occasionally turn off the supply to read the voltmeter I hooked up across the battery). I think it had about about an hour and a half before I totally unhooked the circuit.
What did I do wrong?
I attempted to charge it to its nominal voltage of 3V with a DC power supply (I know people don't recommend this, but I'm really just doing this to play around and am not leaving the battery unattended.) Supply was hooked in series with a resistor to the battery. Articles recommend a max charging current of approximately 0.7C, so I chose a max charging current of 1mA. I chose a charging voltage of 3.1V. So if I set my supply to 3.5V, I chose a resistor of (3.5-3.1)V / 1mA = 400ohms.
However, when I tried this, the battery barely drew any current, as read on an ammeter, and for the most part, the battery voltage stayed at 2.4V (I would occasionally turn off the supply to read the voltmeter I hooked up across the battery). I think it had about about an hour and a half before I totally unhooked the circuit.
What did I do wrong?