If you want to use a "normal" charger with a plug instead of the USB charger supplied, it is advisable to check that the charger is compatible with your toothbrush model. Some Philips Sonicare chargers are interchangeable, but it's best to use the charger supplied with the brush to ensure compatibility and safety. If you have a standard charger with a fixed pin, it may be compatible if your toothbrush has a hole at the base of the handle. However, to be on the safe side, it is advisable to check the manufacturer's specifications or contact customer service for more information.