Canon BJ-10sx - Manual (Page 88)

Installing the Battery Pack
z Recharge the battery pack only when it is fully discharged.
Charging it before it is fully discharged reduces the battery
capacity
z Avoid touching the terminals on the battery pack.
z Remove the battery pack when you are storing the printer.
Make sure you are facing the back of the printer, and follow these steps
to install the battery pack:
1. Grasp the front of the printer with one hand and position the
printer stand with your other hand.
2. Holding the printer securely, press the two recesses on the back
of the printer to release the tabs that hold the battery
compartment cover in place. Lift the battery compartment cover
off the printer case