Prepare yourself against red or dead battery. The Aukey 3600 mAh External Battery Pack holds around 1 charge for most smartphone. It adds 8 hours of talk time to keep your important phone conference going for extra hours; the extra juice let you finish off your work email or keep your Google Map running until you reach final destination. Although primarily designed for apple devices, with AIPower technology the charger is compatible with all 5V iOS, Android and Windows smartphones. It is smart enough to intelligently detect each connected device, identify the correct input current and provide the maximum charging speed safely – for every device, all the time.