How to make your 'dead' batteries last eight times longer

When you throw out your disposable AAs because your remote stopped working, they actually still had about 80% of their power remaining.

A new $2.50 battery sleeve called the Batteriser, coming to Amazon this fall, promises to extend the life of your batteries up to eight times longer by drawing out their remaining power -- which you were about to throw in the garbage. The tiny, 0.1 millimeter-thick stainless steel Batteriser sleeve features an incredibly small circuit board, built to tap into the battery's remaining energy.

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