Low battery is always an issue in Smartphones, no matter how hard you try to reduce the battery consumption on mobile, you still are going to find a way to keep them charged when needed. Here is a list of few
myCharge Peak 6000 Rechargeable Power Bank
This lightweight power charger has a capacity of 6000 mAh and lets you charge 3 devices at a time. It has a built in 30 pin USB cables for charging your Apple device as well.
Pocket Cell is a sleek, lightweight but powerful rechargeable battery for charging your favourite devices, the power capacity is on the little low side with 3000 mAh
Mercury 4S Ultra- slim Portable Solar USB Charger
Though the size of this portable charger is little bigger than others, this one has got solar panels which can power your electronic devices from natural resources.The battery capacity is 2000 mAh.
This battery charger looks like a AA Cell but can power your devices long enough, it has a battery capacity of 2800 mAh.
Easy Acc is a 12000mAh storage capacity portable charger with 4 USB slots and supports charging a wide number of Mobile phones. This portable charger can make your life easy for for for a reasonable price.