This product features a rechargeable built-in 1500 mAh battery, surrounded by a silicone shock absorbing case. Although 1500 mAh will not fully recharge a drained iPhone 5 it will provide 70% more additional capacity to get you through even the most data consuming days."
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips