This 12v back-up battery is designed for use with Cinderella 220-240V powered toilets. If there is a power outage, the battery will automatically supply power to the main fan, ensuring that the toilet does not overheat or produce unpleasant odours. It has a capacity of 2.6Ah/24hr and is a sealed lead acid rechargeable battery. It is compatible with both Classic and Comfort models.