... You will need to remove the old battery and install the new one with a soldering iron. Take note of the polarity of the old battery (i.e. you want to connect the positive battery terminal on the new battery to the same wire). The most difficult part was opening the plastic casing, my shaver had plastic snaps keeping it closed. Eventually I had to just yank it open- luckily nothing broke. Closing it was also a little tricky, putting the circuit board in place without any in instructions. If you are patient, and good with your hands, you can install this battery. ...
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