Matryoshka Battery / Batterie

Same kind of battery has lots of different size. so it is inconvenient to find the exact size of battery when we need it.

Russian traditional doll named "Matryoshka" inspired me to design a battery which can be used each and also all together.

-When "Matryoshka" is used all together, the power is same with battery of regular size.

-"Matryoshka" can be seperated to different size.