I left my house to go to London and Brighton 12 hours ago. My cameras and all phones are on 100% battery.

I bought an ANKER 13000mah power supply last week and I'm using it for the first time today. Took about 12hrs to charge up but apparently you get 4 full charges of an S4 or 5-6 for an iPhone 5.
Would recommend it to anyone. It is easily portable and you can't go wrong with so much power on the go! No doubt I will return home at 10pm tonight with 100% battery on all devices and gadgets still. :p

For all the iPad carriers... 2 full charges I think it was :p

Amazon for 30 quid.