I have an sd550 it uses a 3.7v battery and has no external power option. I was looking at the bottom of the camera and noticed a rubber cover on the battery door.
My plan was to make a wooden block the size of the battery and run wires from the power contacts in the camera out the whole in the door.
I noticed that the battery has 3 contacts, +, T, and -. My idea is to make two of these blocks, one for the camera and one for the charger. Then I would put connectors on either end for cable extensions.
Idealy, i would just make a bigger battery pack, but i don't know how to wire up the contact with the T symbol.
Is that the ground?