Amazon has Duracell Instant USB Charger with Lithium-Ion Battery: includes universal cable with USB and mini USB for $17.93. & q9 o5 s$ D8 F5 x. ]1 v' E$ e W6 Y9 _' ^; v" n
I bought one for my iphone for those times I need more power i.e. Airplane ( anywhere a electrical outlet is not available ).