Checking The Backup Battery - Lenovo ThinkPad R60 9456 Hardware Maintenance Manual

Checkout guide
Note: If the battery pack becomes hot, it may not be able to charge. Remove it
To check the battery pack, do the following:
1. Power off the computer.
2. Remove the battery pack and measure the voltage between battery terminals 1
3. If the voltage is less than +11.0 V dc, the battery pack has been discharged.
4. If the voltage is more than +11.0 V dc, measure the resistance between battery

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 58).
4. Remove the backup battery (see "1120 Backup battery" on page 79).
5. Measure the voltage of the backup battery. See the following figure.
Red (+)
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
32
®
MT ThinkPad ThinkPad R60, R60e, R61, and R61i
from the computer and leave it at room temperature for a while. After it
cools down, reinstall and recharge it.
(+) and 7 (−). See the following figure:
7(-)
6(-)
5
4
3
1(+) 2(+)
Note: Recharging will take at least 3 hours, even if the indicator does not turn
on.
If the voltage is still less than +11.0 V dc after recharging, replace the battery.
terminals 5 and 7. The resistance must be 4 to 30 K .
If the resistance is not correct, replace the battery pack. If the resistance is
correct, replace the system board.
Black (-)
board.
Terminal Voltage (V dc)
1 + 0 to + 12.6
7 Ground (−)
Wire Voltage (V dc)
Red +2.5 to +3.2
Black Ground