I have an old Gomadic battery pack that I bought for an iPod back in January 2010 - High Capacity Rechargeable Pocket Charger for the Apple iPod touch PBPM-1500 $ 49.95
It looks like the one they have now for the NookColor –
Rechargeable Pack Charger for Barnes and Noble Nook Color / NookColor
http://www.gomadic.com/barnes-and-no...y-charger.html
It didn’t work with the iPod Touch and after months of reworking they sent me a free replacement Gomadic Power Pack with LED
http://www.gomadic.com/gomadic-power...usb-cable.html (the charger part that seems to be discontinued now.)
I also have -
Scosche IPDBAT2 Portable Back Up Battery (Comes with an adapter for the Galaxy Tab, but works for the Nook Color also. Connection seems a better fit then the ebay adapter but guess that’s what you get for cheap.)
http://www.amazon.com/Scosche-IPDBAT...5331275&sr=8-1
New Trent iDual-Port Pack IMP50D 5000mAh External Battery Pack
http://www.amazon.com/New-Trent-iDua...5331383&sr=1-4
All of the above battery packs DO work and say it’s charging IF I use the OEM cord and an adapter I bought from ebay -
Barnes & Noble Nook Color filter plug for USB charger
http://cgi.ebay.com/ws/eBayISAPI.dll...E:L:OU:US:1123
I still don’t know if the tips Gomadic has work or if they only trickle charge. So far, the only cord that I’m sure about is the OEM cord. Seems like most battery packs will work but only with the adapter.
Found a wall wart replacement that DOES work – but still – only with the OEM cord.
http://www.zipkord.com/index.php?mai...986vonkejlnof6