The rechargeable battery has worn out on my Oral-B Braun Professional Care 1000 model n2820 electric toothbrush. This video shows how to open it up and replace the NiMh recharceable battery. The battery is a 4/5 AA NiMh. I can no longer find the battery I used for sale, however here are some links to some for sale. Note that the one with tabs will make it super easy to solder:\r
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