The Complete Guide to Buying an External Battery Pack
For example, if you want a battery pack that can keep an iPad Air topped off while you''re playing a graphics-intensive video game or otherwise taxing the system, you''re going to need, no questions asked, a battery pack with a 2.1A charging port. Packs with 1A ports simply won''t be able to keep up; you''ll be burning battery life on the device ...