Li-ion batteries are rechargable up to 500 times, eventually they will wear out and need to be replaced. When the time comes, we suggest looking into local recycling programs or companies to see if there are any options. Most Li-ion batteries are rated at 3.7 volts and should only be used to replace other batteries where the Li-ion batteries used will not exceed the capability of the device. Special 3.0 volt Li-ion batteries can replace 3.0 volt lithium primary batteries.
Some devices may permit the replacement of several lower voltage batteries with fewer Li-ion batteries - where the total voltage of the Li-ion batteries is below that of the total voltage of the batteries being replaced. Please check device information before using Li-ion batteries.