In reply to BuzyG:
> I agree Anker is the way to go. Avoid cheap rubbish from China. I have an older version of this.
> I also have a Hermit shell case for it to live in and a short Anker USB to micro USB cable. Again buy an Anker cable, not a cheap one. Your phone will likely charge in a third of the time and it shouldn't break a week after you receive it, as far too many of the cheap ones do.
You realise Anker is "cheap rubbish from China"?
To the OP: In my experience, Anker products give out as soon as they get a bit cold/damp. Goal Zero stuff is far better in my practical experience.