Canon eos rebel T2i - Manual (Page 28)

Turning on the Power
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When the power switch is set to <1>, the battery level will be
indicated in one of four levels:
z : Battery level is OK.
x : Battery level is slightly down,
but adequate power remains.
c : Battery will be exhausted soon.
n : Battery must be recharged.
Battery Life
The figures above are based on a fully-charged Battery Pack LP-E8, no Live
View shooting, and CIPA (Camera & Imaging Products Association) testing
standards.
The Battery Grip BG-E8 approximately doubles the number of possible shots
with two LP-E8 batteries installed. With size-AA/LR6 alkaline batteries, the
number of possible shots at 23°C / 73°F is approx. 470 shots without flash use
and approx. 270 shots with 50% flash use.
Checking the Battery Level
Temperature At 23°C / 73°F At 0°C / 32°F
No Flash Approx. 550 shots Approx. 470 shots
50% Flash Use Approx. 440 shots Approx. 400 shots
The number of possible shots will decrease with any of the following
operations:
• Pressing the shutter button halfway for a prolonged period.
• Often activating only the AF without taking a picture.
• Using the LCD monitor often.
• Using the lens Image Stabilizer.
The lens operation is powered by the camera’s battery. Depending on
the lens used, the number of possible shots may be lower.
For battery life with Live View shooting, see page 109.
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