Power supply to recharge batteries.

I recall a post, I think over this past Winter, where someone was asking about a solar panel to use for charging their phone on 5 or 6 day trips. If I remember correctly, Rambler replied about using a power cell of some kind instead and offered a recommendation for one in particular. I've searched everywhere and can't find the original post, anyone recall this? Obviously, I'm in the market now.

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