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Well, now you go to Target or WalMart and invest $20 in a digital multimeter, so you can test the output of the charger and the battery.
If that's one of the under-$50 solar panels? It would be most unusual if it wasn't damaged by rain, if it has been outdoors all this time. Who would think, a device designed to be left out in the sun, couldn't be left out period.
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