The electric toothbrush by Sonicare has long been a favourite among consumers for its ability to clean teeth in a way that manual toothbrushes can't. However, while each Sonicare comes with a two-year warranty, eventually the batteries will wear down.
Replacing the batteries
According to the owner's manual, you cannot replace the batteries inside a Sonicare toothbrush. If it's within two years of the purchase, you can use the warranty to get a replacement toothbrush when your batteries die, but if it's after two years you'll need to replace the toothbrush on your own.
Recycling the batteries
You can recycle the batteries. To do this, use a flat-head screwdriver to pry the toothbrush open. Remove the batteries, place them in a container, and take them to your local recycling plant.