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For those reliable gadgets that still take storage cells, the Seesaw Battery by Young Suk Kim will make changing dead AAs much easier. The rounded form of the fuel cell incorporates streamlined attenuated edges that allow one to effortlessly eject the old charge.

Narrowed on both positive and negative ends, the Seesaw Battery offers flexibility of use and reduces the risk of bent fingernails. Designed as a pleasing package as well, this product would do well on the market.