Canon Rebel T2i EOS 550D Instruction Manual page 109

To Enable Live View Shooting
Battery Life with Live View Shooting [Approx. number of shots]
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.
Continuous Live View shooting is possible for approx. 1 hr. 30 min. at 23°C/
73°F (with a fully-charged Battery Pack LP-E8).
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 121-122.
When flash is used, there will be two shutter sounds, but only one shot will
be taken.
Under [6 Live View function settings],
set [Live View shoot.] to [Enable].
Shooting Conditions
No Flash
200
170
A Shooting with the LCD Monitor
50% Flash Use
180
150
109