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I have seen battery packs with USB plugs on them, but I hear the current iPod Touch (2nd Generation?) needs a special signal over the USB connection to take a charge. Is this true? What are some good external battery options that will work with the iPod Touch? I have a few really long airline flights (16+ hours) that it would be nice to not run out of juice on.

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I've heard good things about the Mophie JuicePack for the iPod Touch 2G.

Griffin Technology has the TuneJuice (9v battery-based) and TuneJuice2 (AAA battery-based).

Being that you travel on airplanes a lot, you may want to look into getting a power adapter that works on planes like the Versacharger with airplane adapter from miniSync.

TUAW also recently featured the new X-Power1 Rechargeable iPhone/iPod charging cable. It looks like these are due out at the end of August 09.

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OK, those are some excellent battery packs. Thanks for the link. – Jim McKeeth Aug 1 '09 at 7:04
No problem. Thankfully, my iPhone 3G battery lasted me for the last flight I took. I've not used any of those, but I've seen the JuicePack highly rated before, and even saw it for sale in an iPod vending machine at the Reno, NV airport! – Jared Harley Aug 1 '09 at 7:17
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I used both iPhone battery packs from Kensington and was happy with them when I flew to Germany last year.

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I don't think this is a "good" option, but an interesting one.

Over on Gizmodo there is a guide on how to convert a netbook battery to charge an iPhone.

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I have the Duracell CEF23. It's 4-AA NiMH battery charger with an added USB feature. You put in 4 fully charged AA batteries and it supplies power to its built-in USB port. I use it to power and charge my iPod Touch during long trips/flights.

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