Just finished reading Mike Kinzingers account of a 5 week trip in WCPP. He also had a Brunton solar charger but it sounded like he had rather poor results.
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His trip, however took place in Sept. and I suspect the lower angle of the sun may have had something to do with that. I also don't read anything about the actual re-charging of individual batteries and them employing them in the devices. Or an actual separate "storage cell" type battery. Still determined to give it a shot. Purely experimental and with limited reliance.