Can i use a 1mA source to charge a 3V rechargeable battery? (1mA source is the output from Photodiode. I can't put an amplifier because of some reason. Note that, the photodiode in this case is used to transfer power only.) Got one engineer told me that i can't do that. Because instead of charging the battery, actually, i'm discharge the battery. Both of the battery and source will try to reach a balancing between them, so the current from high voltage battery will flow out to the source. But, there is another answer for that question, said i can charge the battery. Because, the 1mA source will“pushes” the charge in battery from + end to – end. I'm confusing which one is correct?