I'm toying with the idea of buying a powerbank to recharge my phone when I'm on a multiple-day walk. Until now I've shut as many things down as possible to conserve the battery, but it would be nice to be able to relax and not have to be so neurotic about it.
This topic has been discussed on here before - a couple of years ago? - when Anker ones were widely recommended, but a quick look on Amazon just now revealed there are a number of different makes available,
So what should I go for, just to give my phone at least one full charge? The phone has a micro usb charging socket.
(What happens with one of these devices if the phone has, say, 30% charge left, is only part of what is in the powerbank used, leaving a bit more for later use?)
My top criteria is the lightest possible weight, that is a must, and the second is a low price, sub-£25 but the lower the better.