ROMOSS universal nomad Battery 10400 mAh PH40-305 A white 270 gr WARRANTY: 1 YEAR (Accessory)
If you count from a few days camping with friends and your phone should always be operational, then ROMOSS give you full satisfaction. I was able to recharge my iphone 3 times completely and I stayed 5S a charge of 50% of the phone. So for the price