This portable lithium rechargeable battery is extra compact and you can take it everywhere with you its 2200 mah capacity will enable you to charge powerful mobiles smart phones when you are travelling charge the powerbank using the usb cable at any available usb port when you are on holiday or a business trip all you need to do is then connect the powerbank to your mobile using the usb cable supplied can be used on nearly all smartphones ios android blackberryos and symbian l