Canon 5D mark III Clock Battery Location & Removal

This morning I ran into a battery issue with my Canon 5d mark III, and in the interest of being thorough, I wanted to do a full system flush on the camera.  You know the flush I mean – where you pull the battery, card, and even the clock battery, then let the camera sit for 30 minutes to completely “flush” the system.  Think of it as a thorough system reset.

Anyhow, I quickly discovered that the clock battery is not stored in the same location as it is on my older 5d mark II.  A quick Google search turned up plenty of references to performing the process, but nothing that indicated just where the clock battery was located or how to remove it.  Since I was on my own, I decided to go exploring and post images of the process.

You’ll need a very small Philips-head screwdriver; something you might use for repairing glasses.  There’s only a single screw to remove, but be very careful not to lose it.

First, open the rubber flaps that protect the connectors on the camera body's left side.
First, open the rubber flaps that protect the connectors on the camera body’s left side.

Use a small Phillips screwdriver to remove the screw securing the battery holder.
Use a small Phillips screwdriver to remove the screw securing the battery holder.
Once the screw is removed, slide the tray out that contains the battery.
Once the screw is removed, slide the tray out that contains the battery.

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The tray holds the battery even after it's removed from the camera.
The tray holds the battery even after it’s removed from the camera.

Did this help you out?  Please leave a comment below, and follow my Facebook or Google+ page!

Edit 4/18/2015: The replacement button clock battery for the Canon 5d mark III is a CR1616.

7 thoughts on “Canon 5D mark III Clock Battery Location & Removal”

  1. I tried it, but still having issue with the battery. Most of the time, it will not power on. I have to take out the battery and put it back in a few times in order for it to works. I just don’t know how to resolve this issue.

  2. Thanks for this! My ISO WB shutter and aperture were all reverting back to some crazy settings every time aI changed my normal batteries. batteries.

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