Canon EOS 5D EOS 5D Instruction Manual - Page 41
Replacing the Date/Time Battery
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Replacing the Date/Time Battery The date/time (back-up) battery maintains the camera's date and time. The battery's service life is about 5 years. If the date/time is reset when the battery is replaced, replace the back-up battery with a new CR2016 lithium battery as described below. The date/time setting will also be reset, so you must set the correct date/time. 1 Turn the switch to . 2 Unscrew the battery holder screw. Use a small Philips screwdriver. Be careful not to lose the screw. 3 Take off the battery holder. Push out the battery in direction 2. 4 Replace the battery in the battery holder. Make sure the battery is in the proper + - orientation. 5 Tighten the battery holder screw. For the date/time battery, be sure to use a CR2016 lithium battery. 41