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Experimental Canon BP511 Dummy Battery Interface

I ran across this site and project when looking at making an external battery pack for my old Canon Rebel 6.3mp. Batteries were dying and I had nothing to lose. Disassembly was as noted and condtruction of the new interface was quite easy.
I happened to have two 7.2V 3800mA battery packs lying around and the output snf close to 3 times for reserve worked great.
The only problem was when using the dummy pack in the camera, it would not turn on. Playing with a good pack and switching in the interface resulted in learning that there is a small switch that the battery door closes to allow power to run to the rest of the camera. Alternatives are to open up the camera and bypass this switch or somehow get it to clsoe. I am hoping to the pack with tyhe door off but I'm also leaning to cutting a notch in the door to protect the innards from extra dust and dirt.
Great idea overall

Mjww
Sat, 15 Nov 2008 22:48:51 +0000

hello

what is between 'b' and 'd' cap?

lorand
Sat, 13 Dec 2008 15:44:21 +0000

Very informatory site appreciate to develop such arduous work. I followed the instruction for making dummy BP511 for 300D and used different packs like six AA NIMH, six/Nicad and even maganisum AA but when the rebel D was switched on battery sign on the display fluctuate and camera automatically switched off and pressing the switch it on but again off. Voltage checked with digital meter around 7.60 and sometime 8 volt. Connection are as per advice. I may kindly be helped because in remote areas AA is easily available as to BP 511 is concerned.

m shabbir gill
Thu, 29 Jan 2009 10:48:19 +0000

hello Mjww: I will appreciate if u convey experience of using this dummy battery with AA for a long shooting session like BP511. I was afraid to take risk because one of my friend has damaged board of 300D with this pack. What i understand BP511 has built in circuit which control the flow of voltage/supply to the machine. So my dummy was not successful to the above mentioned reasons and avoid to take risk. Thanks in advance.

m shabbir gill
Tue, 02 Jun 2009 10:40:31 +0000

Nice site. Li-Ion cells also have a circuit to cut off power to the camera, else the Li-Ion cells would be damage. I think the typical cut-off voltage used per cell is 2.5 volts so this Li-Ion pack probably drain all the way down to 5 volts (and thuse the camera should run even down to that low voltage) before it shuts off.

Does anyone know how the camera monitors how much battery life is left?

Rick Thorne
Thu, 10 Sep 2009 22:39:37 +0000

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Title: BP-511 battery modification
Weblog: Camera Hacker
Excerpt: Having lot's of trouble with batteries going flat so would like to have a go at modifying my BP-511 batteries. PROBLEM? Have to have the battery compartment closed for camera to operate! Any ideas? Look forward to your reply.
Tracked: Fri, 26 Jun 2009 17:51:21 +0000

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