Energizer XP2000 Universal Rechargeable Power Pack with 2000 mAh - Black Universal portable charger great for cell phone back-up batteries and emergencies--just plug it in for instant power Provides cell phones up to 12 hours of extra power and up to 4 hours of extra power for smartphones Comes with 6 tips to fit a wide range of cell phones Smart LEDs show battery and charging status Comes pre-charged out-of-the-box; maintains charge for up to 1 year