Duracell Rechargeable 3350 mAh Power Bank delivers the lasting power and performance you can count on home or on-the-go. Duracell Rechargeable Power Bank can deliver up to one extra charge on your smartphone and is equipped with 10 important safety features to prevent over-charge, over-discharge, and over-heating. From storm prep to travel needs, Duracell is the #1 trusted battery brand for the moments that matter most.