IBM ThinkPad R40 Hardware Maintenance Manual page 45

3. I f the voltage is less than +14.4 V dc, the battery pack
has been discharged.
N ote: Recharging will take at least 3 hours, even i f the
indicator does not turn on.
I f the voltage is s t i l l less than +14.4 V dc after
recharging, replace the battery.
4. I f the voltage is more than +14.4 V dc, measure the
resistance between battery terminals 4 and 5. The
resistance must be 4 to 30 K Q.
I f the resistance is not correct, replace the battery
pack. I f the resistance is correct, replace the system
board.
F or m a c h in e ty p e 2684, 2685
To check the battery pack, do the following:
1. Power off the computer.
2. R e m o v e the battery pack and measure the voltage
between battery terminals 1 (+) and 5 (-). S ee the
following figure:
N j M 2 1 (+ 1
3. I f the voltage is less than +11.0 V dc, the battery pack
has been discharged.
N ote: Recharging will take at least 3 hours, even i f the
indicator does not turn on.
I f the voltage is s t i l l less than +11.0 V dc after
recharging, replace the battery.
4. I f the voltage is more than +11.0 V dc, measure the
resistance between battery terminals 4 and 5. The
resistance must be 4 to 30 K Q.
Terminal Voltage (V dc)
1 + 0 to + 16.8
5 Ground (-)
Terminal Voltage (V dc)
1 + 0 to + 12.6
5 Ground (-)
G eneral descriptions
Checkout guide
41