My question is this: I am getting a dummy battery to plug into the camera so I can use an external larger battery source. I want to also use an ac adaptor to feed 7.5v to the camera but don't know how much current the camera draws. I need to know so I can get a large enough adaptor to supply the camera. Any help is appreciated!
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Canon makes an accessory called the "AC Adapter Kit ACK-E6" -- which does exactlyl what you want (slipts into the battery compartment but allows the camera to run on AC power.)
Although the Canon site lists this as a $180 accessory, all major stores seem to sell it for $120 (still not cheap.)
There are LOTS of knock-offs (many of which are $25 or less) but READ REVIEWS because I found the number of negative reviews to be extremely high with many claiming that they either didn't work at all, worked only for a few minutes, or were very flakey (camera would lose power in mid session.)
As such, I'm not sure I'd want to roll the dice on a knock-off.
I have a 60Da (a special version of the 60D produced by Canon specifically for astrophotography) and astrophotography tends to eat through batteries very quickly due to the extremely long exposure times involved. As such, Canon includes the ACK-E6 with the camera (so I own one but I didn't have to buy it seperately). The ACK-E6 does work extremely well.
Heating may be caused by battery. I heard that with a battery grip or external battery pack, thing may improve. With a dummy battery, I am not sure.
But you have to be careful with the temperature issue which may cause severe consequence to your camera.
You never know what you're going to get with electronics, but theoretically, the AC/DC conversion takes place in the powerpack, outside of the camera. The battery part of the adapter is nothing more than an oversized plug, it's not going to generate any (notable) heat. Much less than a battery produces due to the chemical reaction.
All that assumes a properly designed electronic, of course.
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