Table of Contents
Advertisement
4. Check the battery status icon again. If the same error still exists, replace the system board. Otherwise,
check the original battery pack. See "Checking the battery pack" on page 34.
Checking the battery pack
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 pack or a battery pack designed for another systems 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.
The battery status icon in the Windows notification area displays the percentage of battery power remaining.
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 pack 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 pack, do the following:
1. Power off the computer.
2. Remove the battery pack 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 pack has been discharged.
If the voltage is still less than +11.0 V dc after recharging, replace the battery pack.
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 coin-cell 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 "1020 Battery" on page 79).
4. Remove the coin-cell battery (see "1090 Coin-cell battery, PCH bracket, and Ethernet bracket" on
page 89).
5. Measure the voltage of the battery. See the following figure.
34
Hardware Maintenance Manual
7(-)
6(-)
5
3 4
2(+)
Terminal
Voltage (V dc)
1, 2
+ 0 to + 12.6
6, 7
Ground (-)
Advertisement
Table of Contents
