Replacing the backup battery

Before you start, print these instructions.

To replace the backup battery under the keyboard with a new one, read the following prerequisites.

Prerequisites for the procedure

DANGER

If the backup battery is incorrectly replaced, there is danger of an explosion. The backup 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 fire.

•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 flame to “vent” from the battery pack or coin cell.

To replace the backup battery under the keyboard, do the following.

Removing the backup battery under the keyboard

1.Turn off the computer; then disconnect the ac power adapter and all cables from the computer. Wait for a few minutes, till the inside of the computer cools before you start the following procedures.

2.Close the computer display, and turn the computer over.

3.Remove the battery. See “Replacing the battery” on page 119.

4.Remove the keyboard. See “Replacing the keyboard” on page 130.

5.Detach the connector (1). Then remove the backup battery (2).

124User Guide

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Lenovo 4242X04, NVS-4200M, 42825BU, 42421A0 Replacing the backup battery, Removing the backup battery under the keyboard
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