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I tried a bit to see what sort of amperage they provide, and couldn't find anything. One thing that I've found makes a big difference is the amperage. For example, I have a cheapo auto-USB adapter, but the amperage is so low, that when I try to charge my phone, it'll only trickle charge at best. If the screen is on, it'll actually lose power! I hope the solar cells they are using can give enough juice!
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