I guess the chances are remote that anyone could make use of this tip, but here it is anyway. With the proper transformer, a cell phone can be charged off the solar electric panels that night light the mileage markers on the country's large, navigable rivers. I found this out last spring when son was canoing home from college during a flood and his cell phone battery died. I was relieved to hear from him, as the flood had put much debris in the river, some of it just under the surface where it can sneak up on a canoer. He did have to climb a short tower to do this, however.
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