Canon FS40 Instruction Manual page 117

Built-in Rechargeable Lithium Battery
The camcorder has a built-in rechargeable lithium battery to keep the
date/time and other settings. The built-in lithium battery is recharged
while you use the camcorder; however, it will discharge completely if
you do not use the camcorder for about 3 months.
To recharge the built-in lithium battery: Connect the compact power
adapter to the camcorder and leave it connected for 24 hours with the
camcorder off.
Disposal
When you delete movies or initialize the memory, only the file alloca-
tion table is altered and stored data is not physically erased. Take the
necessary precautions when you dispose of the camcorder or mem-
ory card, for example by physically damaging it to prevent the leakage
of private data.
If giving the camcorder or memory card to another person, initialize
the built-in memory ( only) or memory card using the [Complete
Initialization] option ( 35). Fill it up with unimportant recordings, and
then initialize it again using the same option. This makes recovering
the original recordings very difficult.
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Additional Information