hello,
I plan to make a Piezoelectric mobile phone charger that will convert the mechanical energy into electrical energy while walking and store it in 3.7v lipo battery. I managed to get around 1.5 to 4v from the Piezoelectric plates. I want to store this energy into the lipo battery. but the problem is that I need a charging circuit that would protect my lipo battery from over charging and causing any damage.
I don't know much about the charging circuits. so can you please tell me do I need this circuit or it would work if I maintain voltage below 3.7v only. If it is required that please recommend me some good charging circuit.