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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??
Yes you need to worry about over-charging them, and over-discharging them, and their temperature, and putting too much charging current into them, etc. You need to build safety into your design. You'll might take a look at something like this linear tech solar battery charger. Notice how it has some safety features and a charge controller built into it. It also has MPPT to which should help you get the most power out of your panels.
I know you want to use a 3V panel but then you'll need to boost the voltage to get high enough to charge them (if you're just using a single panel anyway).
