Amazon has Duracell Instant USB Charger with Lithium-Ion Battery: includes universal cable with USB and mini USB for $17.93. . w: { a. a9 I3 S ; m7 A9 S' Q n7 ]& m0 }% i3 CI bought one for my iphone for those times I need more power i.e. Airplane ( anywhere a electrical outlet is not available ).