Checking The Battery Pack; Checking The Coin-Cell Battery - Lenovo Thinkpad L570 Hardware Maintenance Manual

Checking the battery pack

This computer 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 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.
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. Turn off the computer and disconnect the ac power adapter.
2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 7 (-). See the
following figure:
2(+)
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

To check the coin-cell battery, do the following:
1. Remove the coin-cell battery. See "1080 Coin-cell battery" on page 79.
2. Measure the voltage of the coin-cell battery. See the following figure.
• If the voltage is correct, replace the system board.
• If the voltage is not correct, replace the coin-cell battery.
• If the coin-cell battery discharges quickly after replacement, replace the system board.
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L570 Hardware Maintenance Manual
7(-)
6(-)
5
3 4
Terminal Voltage (V dc)
1, 2 + 0 to + 16.8
6, 7 Ground (-)
Wire Voltage (V dc)
Red +2.5 to +3.2
Black
Ground