Lenovo ThinkPad T420 (English) User Guide - Page 59
Handling the battery, Global Power Settings
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Enabling the battery alarm You can program your computer so that when the battery power falls below a certain level, three events occur: the alarm goes off, a message is displayed, and the LCD is turned off. Do as follows: 1. Start Power Manager. 2. Click the Global Power Settings tab. 3. For Low battery alarm or Critically low battery alarm, set the percentage of the power level and set the action. Note: If your computer enters sleep (standby) or hibernation mode when the battery is low, but the alarm message has not yet appeared, the message will appear when the computer resumes. To resume normal operation, press OK. Handling the battery DANGER Do not attempt to disassemble or modify the battery pack. Attempting to do so can cause an explosion, or liquid leakage from the battery pack. A battery pack other than the one specified by Lenovo, or a disassembled or modified battery pack is not covered by the warranty. DANGER If the rechargeable battery pack is incorrectly replaced, there is danger of an explosion. The battery pack contains a small amount of harmful substances. To avoid possible injury: • Replace only with a battery of the type recommended by Lenovo. • Keep the battery pack away from fire. • Do not expose it to excessive heat. • Do not expose it to water or rain. • Do not short-circuit it. • Store it in a cool dry place. • Keep it away from children. The battery pack is a consumable supply. If your battery begins to discharge too quickly, replace the battery pack with a new one of the type recommended by Lenovo. For more information on replacing the battery pack, contact your Customer Support Center. DANGER Do not drop, crush, puncture, or subject to strong forces. 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. Chapter 2. Using your computer 41