inputs.text: onenot backup - battery impressive amount power even function primary not backup first look rating 5000 mah ipod nano battery 400 mah even iphone 3gs battery holds 1200 mah next test bought smaller 400 mah battery hoping drive video ipod not dead battery dead charging circuit 400 mah battery barely lets play music cant play video battery lets play video no problem instructions suggest use power laptop believe would work well none 3 included adapters fit computer