Batteroo Boost: AA, AAA Battery Life Extender

So you would like your AA, AAA, C, and D-cell batteries to run for a bit longer? Batteroo Boost might help. It is a stainless steel sleeve that slips over disposable batteries and increases their lifespan. It lets you tap into the remaining energy of batteries you may be ready to throw away.

Batteroo Boost sleeves work on new and used batteries. They can be used on different batteries.

[where to get yours]