The rechargeable batteries are solder into the circuit board of the electric shaver. You'll have to use a soldering iron to de-solder the terminals/tabs from the PCB (printed circuit board) in order to get them out.
Then you'll need new replacement rechargeable batteries to solder back into the shaver.
You can get teh correct replacement batteries from Electric Shaver Service in Lincoln, Nebraska (if you're in the US or Canada). They even do service and repair work in about a week, if you want to have them fix your shaver for you.
Here's a link to the battery page with your shaver model's rechargeable batteries for about $15.00 (plus s&h)
http://www.electricshaverstore.com/get_item_13810334_norelco-13810334-electric-shaver-battery-set.htm
Hope you find this Very Helpful and best regards!
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