Your power toothbrush is powered by a replaceable AAA-battery. A single AAA battery should provide enough power for 3 months (180-2 minute brushings).
Before proceeding, make sure your hands and product are dry when you insert the battery.
1) Insert a coin into the coin slot at the bottom of the handle and turn counterclockwise. Gently shake the battery out of the handle.
2) Insert a fresh AAA battery into the battery compartment. Make sure the + and - poles of the battery point in the right direction.
3) Place the removable end cap back on the handle and use a coin to turn clockwise until it is secure and the lock indicator markings on the handle and end cap line up. Note:
If the indication on the handle and end cap do not line up, it may result in your toothbrush not working.