If your Braun Razor doesn't seem to be as powerful as it was when you first bought it, chances are the rechargeable battery is dying and needs to be replaced. Once you change it, chances are your electric razor will start working like new again. The NiMH rechargeable batteries look just like AA alkaline batteries, except they can be recharged over and over again. You can purchase these batteries at any home improvement or electronics store and at most grocery stores.
Remove the battery cover on your Braun razor. The battery pack is located on the back of the actual razor and will snap off once you adjust the cover's lever.
Remove the battery from your Braun razor. It's recommended that you recycle any and all used batteries. Call your local garbage company to find out the best way to recycle batteries.
Insert a new NiMH battery into the battery slot in the back of your shaver and replace the battery cover.