ThinkPad T410 - Checking the Backup Battery

Terminal
Voltage(Vdc)
1+0to+16.8
7
Ground(-)
1(+)
2(+)
3
4
5
6(-)
7(-)
3.Ifthevoltageislessthan+11.0Vdc,thebatterypackhasbeendischarged.
Note:Rechargingwilltakeatleast3hours,eveniftheindicatordoesnotturnon.
Ifthevoltageisstilllessthan+11.0Vdcafterrecharging,replacethebattery.
4.Ifthevoltageismorethan+11.0Vdc,measuretheresistancebetweenbatteryterminals5and7.
Theresistancemustbe4to30KΩ.Iftheresistanceisnotcorrect,replacethebatterypack.Ifthe
resistanceiscorrect,replacethesystemboard.
Checkingthebackupbattery
Dothefollowing:
1.Poweroffthecomputer,andunplugtheacadapterfromit.
2.Turnthecomputerupsidedown.
3.Removethebatterypack(see“1010Batterypack”onpage66).
4.Removethebackupbattery(see“1100Backupbattery”onpage80).
5.Measurethevoltageofthebackupbattery.Seethefollowinggure.
Wire
Voltage(Vdc)
Red+2.5to+3.2
Black
Ground
•Ifthevoltageiscorrect,replacethesystemboard.
•Ifthevoltageisnotcorrect,replacethebackupbattery.
•Ifthebackupbatterydischargesquicklyafterreplacement,replacethesystemboard.
38HardwareMaintenanceManual