Re Steripen solar charger:

“According to the product literature, using solar power will take two days to fully recharge batteries under optimal conditions. Under less than ideal solar conditions, charging could take as long as 5 days (or longer under very poor conditions).”

http://www.backpackgeartest.org/reviews/...lleen%20Porter/


“I timed how long it takes to get from an exhausted battery to a fully charged one. After several tests the average time came out to 5 hours..”
http://www.backpackgeartest.org/reviews/...20Mike%20Lipay/


“I found the solar charging case to work, but very slowly – charging batteries took several days of sun exposure which was a bit disappointing. However, on an extended trip into the backcountry, two sets of batteries could be rotated between active use and charging to ensure that the SteriPEN is always ready.“
http://www.mountainproject.com/v/climbin...ifier/106072675