- Offers portable external power to a variety of devices - Can be charged with any standard micro USB cable - Slim design / Universal Compatibility - Lithium-Ion Battery / Holds charge when not in use This 6,000 mAh Silver Power Bank Portable Charger packs plenty of power and is good for up to 29 hours of web browsing, 37 hours of talk time, 133 hours of music or 29 hours of video. This power bank can be charged with any standard micro USB cable and charger and can be connected to almost any device with a standard USB output for universal compatibility. Featuring a Lithium-Ion battery, this charger will hold up to many recharge cycles for a long life and can hold a charge when not in use. This slim charger is thinner than most wallets, making it easy to carry in a pocket or purse.