USBCELL are rechargeable batteries that have a built-in USB charger and can be re-used hundreds of times. Especially since popular devices like portable GPS, MP3 players, game controllers, etc. that require batteries, it’s more important that we use rechargeable batteries since we use and throw away billions of batteries a year in the U.S. And after the rechargeable batteries (or any batteries for that matter) die, don’t forget to recycle them so they don’t end up in landfills which pollute the air, ground and water.