Reddit reviews PortaPow AA + AAA USB Battery Charger and Power Bank for Mobile Devices
We found 5 Reddit comments about PortaPow AA + AAA USB Battery Charger and Power Bank for Mobile Devices. Here are the top ones, ranked by their Reddit score.
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Posted by IM_THE_DECOY down below.
I can't speak for reliability, because I do not own a USB AA charger, but this one looks interesting:
http://www.amazon.com/PortaPow-Battery-Charger-Power-Bank/dp/B00HCBDV10
...because it can be used in both directions. It can be used to provide USB power from the AA cells, or it can charge the AA cells from USB. Let's say you have a fire going and your USB devices are already charged up. You can carry some extra AA cells as "reservoirs" (and charge them up at such opportune times) and if your USB device runs out of juice during your hike, you can stick it in a pocket of your pack and have this device transferring the charge from some AA cells into the USB device. Charge management would involve always making sure something is getting charged up when you have a fire going -- and maybe a fire is going most of the time you are awake at camp.
You would need to test the practicality of the stove and various charging strategies before you go. That trip is not the place to try this stuff out anew!
....oooor you could just get one of These.
Faction of the cost and weight, and a lot more juice for your electronics.
Seriously? This one for example or maybe go next level and look at this. Before people went out and bought phones that barely survive a day this was basically the standard design (Battery case with USB output + Rechargable batteries).
GoalZero's gear is popular. They don't recommend using alkaline cells.
http://www.amazon.com/Goal-Zero-21005-Guide-Power/dp/B00D2SQ6W8
Cheaper options exist. They claim a 4" smartphone will get 1 charge per 4 AAs.
http://www.amazon.com/PortaPow-Battery-Charger-Mobile-Devices/dp/B00HCBDV10
For a long tour, why not go with solar and a lithium battery? If you're using it extensively for mapping, you might need a full charge every day or so. On a 750 mile trip, that means a few dozen AAs .. that's a couple pounds of AAs.