IBM ThinkPad X40 Hardware Maintenance Manual

Also see for THINKPAD X40: Maintenance manual Install guide Supplementary guide User manual Information

Contents

Checking operational chargingTo check whether the battery charges properly duringoperation, use a discharged battery pack or a battery packthat has less than 50% of the total power remaining wheninstalled in the computer.Perform operational charging. If the battery status indicatoror icon does not turn on, remove the battery pack and let itreturn to room temperature. Reinstall the battery pack. Ifthe charge indicator or icon still does not turn on, replacethe battery pack.If the charge indicator still does not turn on, replace thesystem board. Then reinstall the battery pack. If it is stillnot charged, go to the next section.Checking the battery packBattery charging does not start until the Power Metershows 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 beingovercharged or from having a shortened life.To check the status of your battery, move your cursor tothe Power Meter icon in the icon tray of the Windowstaskbar and wait for a moment (but do not click), and thepercentage of battery power remaining is displayed. To getdetailed information about the battery, double-click thePower Meter icon.Note: If the battery pack becomes hot, it may not be ableto charge. Remove it from the computer and leave itat 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 voltagebetween battery terminals 1 (+) and 5 (−). See thefollowing figure:5(-)1(+)4 3 2Terminal Voltage (V dc)1 + 0 to + 16.85 Ground (−)3. If the voltage is less than +14.4 V dc, the battery packhas been discharged.Note: Recharging will take at least 3 hours, even if theindicator does not turn on.Checkout guideGeneral descriptions 43