After reading your post I started looking around for other battery power systems like that one. Amazon has a bunch of very cheap 5v USB charging systems with both AC input and a mini solar panel (e.g. http://www.amazon.com/SunPlug-Solar-1350-rechargable-battery/dp/B0019ZH5N0/ref=sr_1_1?ie=UTF8&s=electronics&qid=1268367867&sr=1-1). I'm wondering if I can use one of those as a super cheap charge controller. Since the AC charging input is actually just a DC input from an AC wall wart, I wonder if I could run my solar panel (with a voltage regulator) into that AC input on the battery as an external power source, then splice the a USB charging cable from the output for a nicely regulated power source for my camera. For $11 its probably worth trying out.
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