AA+A Battery / Battery

Batteries are used for small home appliances that we get used to. However, each home appliance requires different size of battery. Therefore, if we buy two to four same sized batteries that are packed in one, they can’t be effectively used for those appliances that require different size of battery, in turn, the batteries will be wasted.
The is a new type of battery designed to improve the inconveniences when using AA battery and AAA battery. Users can easily adjust the size of the battery with a spring in the battery if pressing it.