If you're an EE,Orange or T Mobile customer on 4G you can text POWER to 365 to claim a free power stick. It's enough to give most phones a full charge and handy to keep under the seat if you're away all day or overnight.
I picked mine up today. Hopefully not a sign of how good they are, but mine was dead within an hour after only adding about 10% charge to my phone battery Hoping it's because it needed a decent charge in it first (currently charging at home). Maybe good as a stop-gap but I'm kinda glad I got a more powerful one from Amazon last week!
Hope they're not that bad I'll drain and fully charge them first,got my RavPower 15000mah for camping weekends tho