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2. Connect the computer to ac power to charge the batteries. If the battery status icon in the Windows
notification area indicates that the batteries are not charging, remove the batteries and let them return to
room temperature.
3. Reinstall the batteries. If the batteries are still not charging, replace the batteries.
4. Check the battery status icon again. If the same error still exists, replace the system board.
Checking the removable battery
This system supports only batteries specially designed for this specific system and manufactured by Lenovo
or an authorized builder. The system does not support unauthorized batteries or batteries designed for other
systems. If an unauthorized battery or a battery designed for another system is installed, the system will not
charge.
Attention: Lenovo has no responsibility for the performance or safety of unauthorized batteries, and
provides no warranties for failures or damage arising out of their use.
Move your pointer to the battery-status icon in the Windows notification area to check the battery status. The
battery-status icon displays the percentage of battery power remaining and how long you can use your
computer before you must charge the battery.
Note: If the battery becomes hot, it may not be able to charge. Remove it from the computer and leave it at
room temperature for a while. After it cools down, reinstall and recharge it.
To check the battery, do the following:
1. Power off the computer.
2. Remove the battery and measure the voltage between battery terminals 1 (+) and 7 (-). See the following
figure:
1(+)
3. If the voltage is less than +11.0 V dc, the battery has been discharged.
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. If the resistance is
correct, replace the system board.
Checking the coin-cell battery
To check the coin-cell battery, do the following:
1. Disable the built-in battery. See "Disabling the built-in battery" on page 64.
2. Remove the coin-cell battery. See "1110 Coin-cell battery" on page 80.
3. Measure the voltage of the coin-cell battery.
30
A275 Hardware Maintenance Manual
7(-)
6(-)
5
3 4
2(+)
Terminal
Voltage (V dc)
1, 2
+ 0 to + 12.6
6, 7
Ground (-)
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