When I read the title and first post I thought you meant an external device to plug the bb in to charge it. So, going off that...
If you are a do it yourself kind of person who knows how to solder and follow simple directions, I recommend the mintyboost and since I can't post links do an internet search for mintyboost. a woman who goes by ladyada put it together as a project and to get past some poor designs of the 9vdc step down chargers.
I built two, one for my 8330 and one for my fiance and her iphone. The curve has a small battery so the 2aa's that the kit comes with works great. However, the 3g iphone has a high capacity battery so I built hers using 4aa's (basically doubled up on so the circuit still only gets 3vdc, but at twice the milliamps of 2 batteries). It took as long for my soldering iron to heat up than put the kit together.
I looked into the external power source for pandora radio (so glad it is on the blackberry now) and gpsed for when I go on excursions to trace my tracks on google earth or see how far I go.
There are plenty of devices out there that put out 5-6vdc and the needed milliamps to power a phone, but a vast majority on ebay do not have a voltage regulator so if you use very powerful batteries, you can fry your devices.
Just some food for thought.
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