Lenovo T20x2-1 manual Checking the battery pack, IdeaPad Tablet K1 Hardware Maintenance Manual

IdeaPad Tablet K1 Hardware Maintenance Manual

Checking the battery pack

Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life.

To check your battery, move your cursor to the Power Meter icon in the icon tray of the Windows® taskbar and wait for a moment (but do not click it), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Meter icon.

Note: If the battery pack becomes hot, it may not be able to be charged. 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, follow the steps below:

1.Turn off the computer. Follow the removal steps in “1020 Battery pack” on page 33 in “Removing and replacing an FRU” on page 30.

2.Measure the voltage between battery terminals 1 (+) and 14 (-). See the following figure:

14(-) 13(-)12(-)11(-)10

1(+)

2(+) 3(+)

9 8 7 6 54(+)

Terminal Voltage (V DC)

1+0 to +8.4

14 Ground (-)

3.If the voltage is less than +11.0 V DC, the battery pack has been discharged.

Note: Recharging will be continued for at least 3 hours, even though the indicator does not light on.

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 KΩ.

If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board.

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