Lenmar Battery Powered Case for Apple iPhone 4. Since 1965 Lenmar has been building award winning, high quality power related products. Lenmar personally manages the excellence of our products through every aspect from design to production. Lenmar"s ultra-compact external chargers, power adapters and premier rechargeable batteries will keep your laptop & mobile devices powered up, ready for action and keep you productive, too - at home, in the office or on the road. Lenmar Battery Powered Case for Apple iPhone 4. Lenmar"s ultra-compact external chargers, power adapters and premier rechargeable batteries will keep your laptop & mobile devices powered up, ready for action and keep you productive, too - at home, in the office or on the road.