You will find replacement batteries at shaveroutlet.com. See link below
http://shaveroutlet.com/shaver-battery-pack-for-most-norelco-more-p-278.html
To change them you will first need to remove the back cover. Do this by opening the lotion compartment on the back and then removing the screws on the back. Remove the back to reveal the inside of the shaver. For easier replacement, it is sometimes suggested that you use a modified installation technique. This is to break the tabs off of the old batteries rather than unsoldering them from the circuit board.
This allows the old batteries to be removed but leaves the tabs attached to the circuit board. You can then solder the tabs from the new batteries to the old existing tabs
If this is not something you can do yourself, shaveroutlet.com can do it for you. See link below
http://shaveroutlet.com/professional-battery-replacement-for-most-models-p-374.html
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