Canon eos rebel t1i - Manual (Page 203)

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If a problem occurs, first refer to this Troubleshooting Guide. If this
Troubleshooting Guide does not resolve the problem, contact your
dealer or nearest Canon Service Center.
Do not recharge any battery pack other than genuine Canon Battery
Pack LP-E5.
The battery is not properly installed in the camera (p.26).
Recharge the battery (p.24).
Make sure the battery compartment cover is closed (p.26).
Make sure the card slot cover is closed (p.31).
Press the <B> button (p.42).
If the power is cut off while an image is being recorded to the card, the
access lamp will light/blink for a few sec. When the image recording is
completed, the power will turn off automatically.
Use a fully-charged battery (p.24).
The rechargeable battery will degrade after repeated use. Purchase a
new one.
If you use Live View shooting or shoot movies for a prolonged period
(p.105, 121), the number of possible shots will decrease.
Troubleshooting Guide
Power-Related Problems
The battery cannot be recharged with the battery charger provided.
The camera does not operate even when the power switch is
set to <1>.
The access lamp still blinks even when the power switch is
set to <2>.
The battery becomes exhausted quickly.