The key Chain solar charger is meant to slow down the drain of your battery, but if you’re patient enough, you might be able to charge it, although I guess that it would take a few days for a full charge (if the phone is turned off).
The manufacturer had some kind of marketing gimmick around “being green”, but that’s crap: more carbon will be generated by creating, shipping and disposing of this device than it will ever save. Price: $22
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