Power banks are becoming more and more popular, mostly because more and more power can be stored in these small devices. With chargers like the Hyper Juice Power Bank, we've reached the point where you can even charge a laptop with a power bank. If you want to charge your other devices, the Hyper Juice Power Bank is there for you too. You can charge an average smartphone up to 7 times. That should keep you going for a while. The device has 2 USB ports, so it's no problem if both your tablet and smartphone are dead.
Note: this power bank is supplied without aUSBcable.