This article shows you how to hack your digital SLR camera to draw power from a RC battery pack. Why would you want to do something like this? There are numerous reasons:
In this article, we use the Canon EOS D30 and interfaces through the Canon BP-511 battery pack. However, the same concept can be applied to virtually any digital camera. You just have to make sure that the voltage specification matches closely.
The Canon BP-511 battery pack is spec'ed at 7.4 volts. Most digital SLR cameras uses battery packs in the 7 to 8 volts range. The 7.2 volt RC battery pack is perfect for this application.
You can find RC battery packs at your local hobby store that carry R/C car and R/C planes. They are practically standard in the R/C hobby. If you don't have a local R/C hobby store, you can order it online.
The RC battery pack comes in a few different varieties. Originally they are only available with NiCd battery cells. Nowadays, you can get them with NiMH battery cells. The NiCd version is a little cheaper than the NiMH battery packs. But the NiMH battery packs are superior in almost every way compared to the NiCd battery packs. The biggest noticeable differences are 1) NiCd battery pack loses charge in about a day, while NiMH will lose charge over several days; 2) NiMH has higher capacity.
You can get RC battery packs in 6 cells (7.2 volts) or 7 cells (8.4 volts). Check your digital camera for voltage requirements, then get the battery pack that matches.
Amazon has battery packs with the Tamiya connector and the Traxxas connector. You can use either. I tend to stay with the tried and true Tamiya connector. And that's the connector you will see in this article. You can even convert between the two with this adapter: Traxxas Charging Adapter to Standard Tamiya Connector