How to make a USB trickle Battery charger that won't overcharge?
USB devices operate at 5v and 400mA. Can I charge them at 5v and 100mA ,like a trickle charger, and keep the battery from over-charging? is there some kind of ratio battery size calculation to see how low the amps need to be for it to trickle charge?
Is there such a thing as a small,cheap, voltage overcharge protection component?