Canon BJ-30 - Manual (Page 143)

Chapter 9 Installing and Using the Battery Pack 135
8. Turn the printer over and set it in the upright position.
Charging the Battery Pack
To charge the battery pack, you attach the AC adapter to the battery case.
When the AC adapter is connected, the battery pack charges whenever the
printer is idle (whether or not it is turned on).
N
Always charge a new battery pack. A new battery pack is not charged.
It takes approximately 10 hours to charge a new battery or a fully
discharged battery.
With a fully charged battery pack, you may be able to print up to 180 pages
(1500 characters/page) without the use of AC power. The actual printing
time depends on the complexity of the data you are printing.
Installing/Using
the Battery Pack