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Extension cords and related devices
Ensure that extension cords, surge protectors, uninterruptible power supplies, and power
strips that you use are rated to handle the electrical requirements of the product. Never
overload these devices. If power strips are used, the load should not exceed the power
strip input rating. Consult an electrician for more information if you have questions about
power loads, power requirements, and input ratings.
Plugs and outlets
If a receptacle (power outlet) that you intend to use with your computer equipment appears
to be damaged or corroded, do not use the outlet until it is replaced by a qualified
electrician.
Do not bend or modify the plug. If the plug is damaged, contact the manufacturer to
obtain a replacement.
Some products are equipped with a three-pronged plug. This plug fits only into a grounded
electrical outlet. This is a safety feature. Do not defeat this safety feature by trying to
insert it into a non-grounded outlet. If you cannot insert the plug into the outlet, contact
an electrician for an approved outlet adapter or to replace the outlet with one that enables
this safety feature. Never overload an electrical outlet. The overall system load should
not exceed 80 percent of the branch circuit rating. Consult an electrician for more
information if you have questions about power loads and branch circuit ratings.
Be sure that the power outlet you are using is properly wired, easily accessible, and located
close to the equipment. Do not fully extend power cords in a way that will stress the
cords.
Connect and disconnect the equipment from the electrical outlet carefully
Batteries
All personal computers manufactured by Lenovo contain a non-rechargeable coin cell battery
to provide power to the system clock. In addition many mobile products such as ThinkPad
notebook PCs utilize a rechargeable battery pack to provide system power when in portable
mode. Batteries supplied by Lenovo for use with your product have been tested for
compatibility and should only be replaced with Lenovo approved parts.
Never attempt to open or service any battery. Do not crush, puncture, or incinerate batteries
or short circuit the metal contacts. Do not expose the battery to water or other liquids.
Only recharge the battery pack strictly according to instructions included in the product
documentation.
Battery abuse or mishandling can cause the battery to overheat, which can cause gasses
or flame to “vent” from the battery pack or coin cell. If your battery is damaged, or if
you notice any discharge from your battery or the buildup of foreign materials on the
battery leads, stop using the battery and obtain a replacement from the battery manufacturer.
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
viii ThinkPad 90W AC/DC Combo Adapter User’s Guide