how can I understand if a battery is dead?
Here is my experience with that and what doesn’t convince me too much
I have a couple of batteries that are pretty new and work well. After each flight, I charge them with my IMAX B6 and read the amount of milliamps loaded into the battery. Normally, in order to go from 11.1V to 12.6V on a 3S 1500mAh I need about 1300 mA … that is quite correct I would say. I never discharge it completely, but only up to 85/90%.
I have also a battery that is almost dead. It was the first battery I used, I have discharged it a couple of times to 7 Volts or less … it was so low that the charger didn’t even recognized it as 3S but only 2S. Here the strange fact: when I charged it this morning with my IMAX B6, the number of milliamps I needed to pump-in in order to go from, let’s say 10V to 12.6V, was 1600mA
This sounds strange to me … If a battery is broken, I would expect to deliver less current while used and so, in order to charge it from flat to full, I would also expect to pump-in less current in order to raise the voltage up to the 12.6V.
Is my expectation fair or what is wrong in my assumptions?