Yes, the battery in your electric toothbrush can be replaced. Depending on the model, the battery replacement process involves different steps. The first hurdle is getting the toothbrush handle open and there are a few tricks to doing this which we explain. Once the toothbrush has been opened up the old battery can be removed and replaced with a new rechargeable battery. We have photographic guides to battery replacement for most Braun Oral B and Philips Sonicare toothbrushes in the battery replacement section of our website here.