Give yourself a power boost! BoostBloc4000 from Etón is a powerful back-up battery pack with a 4000mAH lithium ion polymer battery that provides long-lasting reliable power whenever and wherever you need it. When fully charged, the fast and efficient BoostBloc4000 fully charges most smartphones twice, so you’re never caught powerless. With its sleek and elegant design, BoostBloc4000 fits in the palm of your hand, and features a Mini-USB DC input to recharge the bloc. An LED charge indicator lets you monitor the battery charge level when you give it a quick shake
On a plane or trekking in the woods, BoostBloc4000 provides the power you need to stay fully charged, wherever you are.
- Fully charges most smartphones twice when fully charged
- Includes Mini-USB Cable to recharge the BoostBloc
- LED battery charge indicator
- Shake unit to check battery level
- Dimensions: 1.4"H x 1.6 "W x 1.6"D
- Weight: 2.5oz
Most Helpful Customer Reviews
Does not hold a charge after having charged up to 100%. Slowly depletes its charge. This pack (a 4000mah battery) does not charge a dormant Galaxy S3 (a 2100mah phone) more than once. Waste of money, would prefer a refund.