Canon EOS 40D - Manual (Page 174)

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If there is a problem, 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 Battery Pack BP-511A,
BP-514, BP-511, or BP-512.
The battery is not properly installed in the camera. (p.26)
Make sure the battery compartment cover is closed. (p. 26 )
Make sure the CF card slot cover is closed. (p. 28 )
Use a fully-charged battery. (p. 24 )
The rechargeable battery will degrade after repeated use. Purchase a
new one.
Auto power off is in effect. If you do not want auto power off to take
effect, set the [5 Auto power off] menu to [Off].
Recharge the battery. (p.24)
Troubleshooting Guide
Power
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 battery becomes exhausted quickly.
The camera turns off by itself.
Only the <
c
> icon blinks on the LCD panel.