Checking The Backup Battery - Lenovo ThinkPad Edge E130 Hardware Maintenance Manual

If the voltage is still less than +11.0 V dc after recharging, replace the battery.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery terminals 5 and 7.
The resistance must be 4 to 30 K Ω. 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 power adapter from it.
2. Turn the computer upside down.
3. Remove the battery pack (see "1010 Battery pack" on page 56).
4. Remove the backup battery (see "1150 Thermal fan assembly" on page 75).
5. Measure the voltage of the backup battery. See the following illustration.
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the backup battery.
• If the backup battery discharges quickly after replacement, replace the system board.
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Hardware Maintenance Manual
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground