IBM M400 - Manual (Page 11)

Batteries can degrade when they are left unused for long periods of time. For some
rechargeable batteries (particularly Lithium Ion batteries), leaving a battery unused in a
discharged state could increase the risk of a battery short circuit, which could shorten
the life of the battery and can also pose a safety hazard. Do not let rechargeable
Lithium-Ion batteries completely discharge or store these batteries in a discharged
state.
Heat and product ventilation
Computers generate heat when turned on and when batteries are charging. Notebook
PCs can generate a significant amount of heat due to their compact size. Always
follow these basic precautions:
v Do not leave the base of your computer in contact with your lap or any part of
your body for an extended period when the computer is functioning or when the
battery is charging. Your computer produces some heat during normal operation.
Extended contact with the body could cause discomfort or, potentially, a skin burn.
v Do not operate your computer or charge the battery near flammable materials or in
explosive environments.
v Ventilation slots, fans and/or heat sinks are provided with the product for safety,
comfort, and reliable operation. These features might inadvertently become blocked
by placing the product on a bed, sofa, carpet, or other flexible surface. Never
block, cover or disable these features.
CD and DVD drive safety
CD and DVD drives spin discs at a high speed. If a CD or DVD is cracked or
otherwise physically damaged, it is possible for the disc to break apart or even shatter
when the CD drive is in use. To protect against possible injury due to this situation,
and to reduce the risk of damage to your machine, do the following:
v Always store CD/DVD discs in their original packaging
v Always store CD/DVD discs out of direct sunlight and away from direct heat
sources
v Remove CD/DVD discs from the computer when not in use
v Do not bend or flex CD/DVD discs, or force them into the computer or their
packaging
v Check CD/DVD discs for cracks before each use. Do not use cracked or damaged
discs
General safety guidelines
ix