Canon eos rebel t1i - Manual (Page 28)

Turning on the Power
28
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
[Approx. number of shots]
The figures above are based on a fully-charged Battery Pack LP-E5, shooting
through the viewfinder, and CIPA (Camera & Imaging Products Association)
testing standards.
Checking the Battery Level
Temperature
Shooting Conditions
No Flash 50% Flash Use
At 23°C / 73°F 500 400
At 0°C / 32°F 490 380
The actual number of shots may be fewer than indicated above
depending on the shooting conditions.
Pressing the shutter button halfway for long periods or operating only the
autofocus can also reduce the number of possible shots.
The number of possible shots will decrease with more frequent use of
the LCD monitor.
The lens operation is powered by the camera’s battery. Depending on
the lens used, the number of possible shots may be lower.
Using the Image Stabilizer of the lens will decrease the number of
possible shots (shorter battery life).
For battery life with Live View shooting, see page 107.