I want to charge 'rechargeable' 3.6v Lithium Coin Cell batteries with one or two 3v 100ma solar panels. Do I need to worry about safety and overcharging the batteries? How can I measure if the batteries are fully charged or not?
Do rechargeable 3.6v Lithium Coin Cell batteries have a small voltage drop happen when fully charged? If so how could I measure that and stop the charging??