IBM ThinkPad i Series 1500 User Manual download pdf (Page 41)

Note: Signal lines, not used in these steps, are used

for communications between the system and

the battery.

3. First, discharge the battery, until the voltage is less

than 10.8V (LiIon) or 9.6V (NiMH). Then, charge the

battery for 30 minutes. Now, check the voltage. If the

voltage is still less than 10.8V (Li-Ion) or 9.6V (NiMH),

replace the battery.

4. If the voltage is more than 10.8V (LiIon) or 9.6V

(NiMH), measure the resistance between battery ter-

minals 5 and 7. The resistance must be 390Ω (Li-Ion)

or 10KΩ (NiMH). If the resistance is not correct,

replace the Battery ASM. If the resistance is correct,

replace the DC-DC & BATT board, then the system

board.

Terminal Signal / Voltage (V dc)

1 BT-

2 BT-SENSE

3 BT-SCLK

4 BT-SDATA

5 BT-TH

6 BT+SENSE

7 BT+

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IBM ThinkPad i Series 1500 User Manual Page 41