Solar charger

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There are plenty of small solar chargers/batteries out there so I'm looking at that as an option to extend battery life, but I'd like a bit of info before I go shopping and end up with either something useless, or worse fry the Shift.
The battery on a Shift is 7.4, and the AC charger outputs 12v, so what output would be needed on a solar charger?

try 12v 3a should be ok , but rgds to solar charging battery - it will take a long long long long time to fully charge the battery and quick to fully used the juice , so take care if u r buying

in germany there is a specialist called solarc for laptop charging solutions:

http://www.solarc.de/cms/pages/en/pr...ducts/e.go.php

I think the e.go professional can charge a Shift. (I use that for charging my Iphone, Nokia and WM devices if I around the world :)

or - if you need more power - the company have bigger industrial solutions too..