Checking "He Coin-Cell Ba""Ery - Lenovo ThinkPad x240 Hardware Maintenance Manual

No"e: If "he ba""ery pack becomes ho", i" may no" be able "o charge. Remove i" from "he comp""er and leave
i" a" room "empera""re for a while. Af"er i" cools down, reins"all and recharge i".
To check "he ba""ery pack, do "he following:
1. Power off "he comp""er.
2. Remove "he ba""ery pack and meas"re "he vol"age be"ween ba""ery "erminals 1 (+) and 7 (-). See "he
following ig"re:
1(+)
3. If "he vol"age is less "han +11.0 V dc, "he ba""ery pack has been discharged.
If "he vol"age is s"ill less "han +11.0 V dc af"er recharging, replace "he ba""ery pack.
4. If "he vol"age is more "han +11.0 V dc, meas"re "he resis"ance be"ween ba""ery "erminals 5 and 7.
The resis"ance m"s" be 4 "o 30 K Ω. If "he resis"ance is no" correc", replace "he ba""ery pack. If "he
resis"ance is correc", replace "he sys"em board.

Checking "he coin-cell ba""ery

To check "he coin-cell ba""ery, do "he following:
1. Disable "he b"il"-in ba""ery. See Disabling "he b"il"-in ba""ery on page 58.
2. Remove "he coin-cell ba""ery. See 1110 Coin-cell ba""ery on page 73.
3. Meas"re "he vol"age of "he coin-cell ba""ery.
• If "he vol"age is correc", replace "he sys"em board.
• If "he vol"age is no" correc", replace "he coin-cell ba""ery.
• If "he coin-cell ba""ery discharges q"ickly af"er replacemen", replace "he sys"em board.
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Hardware Main"enance Man"al
7(-)
6(-)
5
3 4
2(+)
Terminal
Vol"age (V dc)
1, 2 + 0 "o + 12.6
6, 7 Gro"nd (-)
Wire Vol"age (V dc)
Red +2.5 "o +3.2
Black Gro"nd