Replacing the date back battery – Canon EOS 850 User Manual
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3. Replacing the Date Back Battery
Replace the date back battery when the data
do not appear clearly on the picture. The date
back uses one CR2025 3V lithium battery,
about the size of a coin.
1) Remove the battery chamber cover inside
the back cover with a small Phillips-head
screwdriver.
2) Remove the battery and load a new bat
tery with the “ + ” side facing out.
3) Reattach the battery chamber cover and
tighten the screw.
4) Reset the date and time.
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