Pin outs for Canon 1100D battery pack?

[Stargazer33]

Hi, Does anyone know the pin outs for a Canon 1100D battery pack?

I am trying to build an external power supply for my 1100D and have bought a cheap replacement battery that I have pulled apart, but there are four contacts across it and I am not sure which ones are the +ve and -ve terminals.

I have taken some pictures of the regulator board that was at the top of the two batteries:

The first picture shows the component side with the three contact pads marked B+, B- and Bc.  The B+ and B- pads were connected to the +ve terminals of the batteries and the Bc was connected to the -ve terminals of the batteries. However, when I connected these terminals up to a regulated bench power supply unit set to 10 volts DC, I was only getting a couple of volts at a couple of the contact pads (shown in the second and third photos).

So rather than go through the regulator board, I thought I would just solder my dc/dc converter to the correct terminals to power the camera. This is where my question comes in. Which of the four contacts as shown in the last picture are the +ve and -ve terminals.

Sorry for the waffle and thanks if you can help. 

BTW: there are no markings on the battery case or label itself to help - cheap copy component made in China. 

[Gweedo]

Have a look at this thread:

http://stargazerslounge.com/topic/143006-1100d-external-power-help/

it may help

[Gina]

I gave all the info on the battery connections in that thread and have no more to add.  I have used several 1100Ds successfully with these connections.  HTH

[Stargazer33]

Thanks Gweedo, Gina!

I don't know why my search didn't find that thread. I was sure that someone had done this hack already. My battery looks exactly like Jasons pictures so I will wire up exactly the same as his.

Thanks again & I hope you are missing all this horrible weather at the moment, not to mention the flood waters!

Clear skies. 

[Stargazer33]

Didn't work connecting up the power regulator board in my hacked battery pack so I had to connect the wires to the contact terminals directly - as shown below. I first removed all the surface mount components.

I set my dc/dc converter to 8.4v - the reading I was getting from a full battery - and the camera powers up lovely.

The +ve wire is connected to the B+ terminal (wire on the right) and the -ve wire is on the left, connected to the return from one of the sm components solder pads.