Lenovo ThinkPad 560Z TP 560Z Hardware Maintenance Manual for use by Authorized - Page 18
Checking the Battery Pack, Checking the Backup Battery, If the voltage is more than
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reinstalled battery pack is not charged, go to the next section. Checking the Battery Pack: Battery charging will not start until the Fuel-Gauge shows that less than 95% of the total power remains; with this condition the battery pack will charge to 100% of its capacity. This protects the battery pack from being overcharged or having a shortened life. Do the following: 1. Power off the computer. 2. Remove the battery pack and measure the voltage between battery terminals 1 (+) and 4 (−). See the following figure: 3. If the voltage is less than +11.0 V dc, the battery pack has been discharged. Recharge the battery pack. Note: In this case, the battery pack is over-discharged. It takes the at least 2 hours to recharge the battery pack even if the indicator does not turn on. 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 pack terminals 3 and 4. The resistance must be 4 to 30 K ohm. If the resistance is not correct, replace the battery pack. If the resistance is correct, replace the system board. Checking the Backup Battery 1. Power off the computer and unplug the AC Adapter from the computer. 2. Turn the computer upside down. 3. Remove the backup battery (see "1010 Backup Battery" on page 45). 4. Measure the voltage of the backup battery. See the following figure. Note: Be careful not to measure the wrong side of the backup battery. 16