I am confused by the original post. The 60d can run off a 5v external cell battery. Using the 1\8 stereo input, I think you would want a 9v battery box to power pip mics like dpa 4061s, countryman b3s, or at853s. If you want to run 48v mics, then you'd need to look for a tiny box, mixpre, grace preamp...something like that. At that point the $300 for 4 channels of 48v power on the 70d looks like an overall less expensive and more convenient option.