Canon EOS Rebel T4i 18-135mm IS STM Lens Kit Instruction Manual page 145

Enabling Live View Shooting
Battery Life with Live View Shooting
Temperature
At 23°C / 73°F
At 0°C / 32°F
The figures above are based on a fully-charged Battery Pack LP-E8 and CIPA
(Camera & Imaging Products Association) testing standards.
With a fully-charged Battery Pack LP-E8, continuous Live View shooting is
possible as for approx. 1 hr. 30 min. at 23°C / 73°F.
In the <F> and <G> shooting modes, the picture area will be smaller
than with other shooting modes.
During Live View shooting, do not point the lens toward the sun. The
sun's heat can damage the camera's internal components.
Cautions for using Live View shooting are on pages 165-166.
When flash is used, there will be two shutter sounds, but only one shot
will be taken. Also, the time it takes to take the picture after you press the
shutter button completely will be slightly longer than with viewfinder
shooting.
If the camera is not operated for a prolonged period, the power will turn
off automatically as set with [52: Auto power off] (p.201). If [52: Auto
power off] is set to [Disable], Live View shooting will end automatically
after approx. 30 min. (camera power remains on).
With the stereo AV cable AVC-DC400ST (sold separately) or HDMI cable
HTC-100 (sold separately), you can display the Live View image on a TV
(p.258, 261).
Set [A: Live View shoot.] to [Enable].
[Approx. number of shots]
Shooting Conditions
No Flash
200
170
A Shooting with the LCD Monitor
50% Flash Use
180
150
145