IBM 2681 Hardware Maintenance Manual - Page 46
Checking, backup, battery
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Checkout guide If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board. Checking the backup battery Do the following: 1. Power off the computer, and unplug the ac adapter from it. 2. Turn the computer upside down. 3. Remove the battery pack (see "1010 Battery pack" on page 64). 4. Remove the backup battery (see "Checking the battery pack" on page 40). 5. Measure the voltage of the backup battery. See the following figure. Red(+) Blue(-) Wire Red Blue Voltage (V dc) +2.5 to +3.2 Ground v If the voltage is correct, replace the system board. v If the voltage is not correct, replace the backup battery. v If the backup battery discharges quickly after replacement, replace the system board. 42 ThinkPad R40
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