Superb for trekking,
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This review is from: Powermonkey Extreme 5V and 12V Solar Portable Charger (Sports)
Used this while trekking for a month in Nepal. Never needed to use anything else to keep 2 cameras and a video camera charged at all times.
It is slow to charge in the sun but I found it easy to strap to my ruck sack and let it trickle charge for a couple of days.
Absolutely superb. Highly recommended.