Charge a 3.7v Lion with a 4.2v Lipoly charger

batteriesbattery-charginglithium ion

I have some 3.7v (when fully charged) lion batteries that I would like to repurpose. All I have to charge these is a few chargers for some 4.2v lipo (when fully charged) batteries. The specific charger is here. It puts out 100 mA. Would this difference in voltage result in the harming of either my charger or the battery, or would it be safe?

Thanks for your help.

Best Answer

3.7V is the nominal voltage of the cell. As long as the maximum voltage for the cell is 4.2V or higher and the charge current is equal to or less than the amount recommended in the datasheet (usually 0.8C or less is safe) then you can charge the cell with the charger.