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7. Turn the computer over again and reinstall the external battery pack. Connect the ac power adapter and
all cables.
Replacing the RTC battery
Before you start, print these instructions.
DANGER
If the RTC battery is incorrectly replaced, there is danger of an explosion. The RTC battery 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 re.
• Do not expose it to excessive heat.
• Do not expose it to water or rain.
• Do not short-circuit it.
• 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 ame to “vent” from the battery
pack or RTC battery.
To replace the RTC battery, do the following:
1. Disable the built-in battery. See “Disabling the built-in battery” on page 67.
2. Close the computer display, and turn the computer over.
3. Remove the external battery pack. See “Replacing the external battery pack” on page 69.
4. Remove the base cover assembly. See “Replacing the base cover assembly” on page 71.
5. Detach the connector 1 , and then remove the RTC battery 2 .
Chapter 6. Replacing devices 87