Canon CDI-E075-010 - Manual (Page 180)

174
Using the Wireless Controller
Installing the Battery
Install the date battery (CR2025) into Wireless Controller WL-DC100 before use.
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Be particularly careful to keep the date batteries out of the reach of children. Seek
medical assistance immediately if a child swallows a battery since corrosive battery
fluids could damage the stomach or intestinal wall.
1
Place your fingertip on
q and press it
in the direction of the arrow while
placing another fingertip on
w and
removing the battery holder.
2 Place the date battery in the battery
holder with the negative terminal (-)
facing up.
3
Replace the battery holder into the wireless controller.
Appendix
Negative Terminal (-)