Tag Archives: clock battery

How To Change or Remove the Canon EOS 1D-X Clock / Backup Battery

You know about the big battery in your Canon 1D-X, but did you know all modern cameras also have a small watch battery that keeps the clock and other settings  while the main battery is removed?

While it typically would take many years, sometimes this battery goes dead, causing your camera to lose all its settings while the main battery is out and charging.  Or perhaps you’ve had some kind of technical issue with your camera for which doing a full factory reset would be useful.

** WARNING: IF IT’S NOT ALREADY OBVIOUS, DOING THIS WILL COMPLETELY ELIMINATE ALL CUSTOMIZATIONS AND SETTINGS FROM YOUR CAMERA.  USE THE 1DX’S ABILITY TO BACK THEM UP TO A FILE BEFORE PERFORMING THIS OPERATION. FOLLOW THESE INSTRUCTIONS AT YOUR OWN RISK. **

Edit to above warning – So that’s not true.  Previous 1D series cameras will lose all settings, but the 1D-X stores many of the settings in flash memory, so they persist even after pulling the backup battery.  To reset back to factory, you’ll also need to visit two menus.  The first is the yellow Wrench menu, page 4, then select “Clear all camera settings.”  This poorly named menu item clears some camera settings.  The next place to visit is the orange Camera menu page 7, and select “Clear all Custom Func.”  These two menu items plus removing the backup battery will put the camera back to factory.

Here are the steps to remove your 1D-X’s backup battery.  The only tool you’ll need is a PH00 or Philips-head 00 size screwdriver.  If you need to replace the battery, look for a 3V CR2025.

The first step to replacing the backup / clock battery in the Canon 1D-X, is to remove the main battery.
The first step to replacing the backup / clock battery in the Canon 1D-X, is to remove the main battery.
The first step to replacing the backup / clock battery in the Canon 1D-X, is to remove the main battery.
Turn the camera upside down.

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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.

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