Performoperationalcharging.Ifthebatterystatusindicat ororicondoesnotturnon,removethebattery
packandletitreturntoroomtemperature.Reinstallthebatt erypack.Ifthechargeindicatororiconstilldoes
notturnon,replacethebatterypack.
Ifthechar geindicatorstilldoesnotturnon,replacethesystemboard.Thenreinstallthebatterypack.Ifitis
stillnotcharged,gotothenextsection.
Checkingthebatterypack
Batterychar gingdoesnotstartuntilthePowerManagerBatteryGaugeshowsthatlessthan96%ofthe
totalpowerr emains;underthisconditionthebatterypackcanchargeto100%ofitscapacity.Thisprotects
thebatt erypackfrombeingoverchargedorfromhavingashortenedlife.
Tocheckyourbattery,moveyourcursortothePowerManagerBatteryGaugeiconintheicontrayofthe
Windowstaskbarandwaitforamoment(butdonotclick),andthepercentageofbatterypowerremaining
isdisplayed.Togetdetailedinformationaboutthebattery,double-clickthePowerManagerBattery
Gaugeicon.
Note:Ifthebatterypackbecomeshot,itmaynotbeabletocharge.Removeitfromthecomputerandleave
itatroomtemperatur eforawhile.Afteritcoolsdown,reinstallandrechargeit.
Tocheckthebatterypack,dothefollowing:
1.Poweroffthecomputer.
2.Removethebatt erypackandmeasurethevoltagebetweenbatteryterminals1(+)and7(-).Seethe
followinggure:
TerminalVoltage(Vdc)
1+0to+16.8
7Ground(-)
1(+)2(+)3456(-) 7(-)
3.Ifthevoltageislessthan+11.0Vdc,thebatterypackhasbeendischarged.
Note:Rechargingwilltakeatleast3hours,eveniftheindicatordoesnotturnon.
Ifthevoltageisstilllessthan+11.0Vdcafterrecharging,replacethebattery .
4.Ifthevoltageismorethan+11.0Vdc,measuretheresistancebetweenbatteryterminals5and7.
Ther esistancemustbe4to30KΩ.Iftheresistanceisnotcorrect,replacethebatterypack.Ifthe
resistanceiscorrect,replacethesystemboard.
Checkingthebackupbattery
Dothefollowing:
1.Poweroffthecomputer,andunplugtheacpoweradapterfromit.
2.Turnthecomputerupsidedown.
3.Removethebatterypack(see“1020Batterypack”onpage61).
4.Removethebackupbattery(see“1080Backupbattery”onpage72).
5.Measurethevoltageofthebackupbattery.Seethefollowinggure.
34ThinkPadX220TabletandX220iTabletHardwareMaintenanceManual