If you connect a solar panel to a phone battery, but the solar panel provides about 1/4 (or 25%) of charge (mA) compared to the battery's original charger. Will this slow power charge the battery (albeit at a very slow rate)?
If so, what would be side effects of the battery being left on this slow charge all day every day?
EDIT: This question is for charging the battery separately from the phone and so extra precautions as highlighted below are needed to control V and mA, etc.
I want to charge the battery while it's still in the phone. Solution is also below in the answers and comments.