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(1) Reason:

a. Charger or electro circuit can't be fit for the battery.

b. Overcharge and overdischarge, etc.

c. Battery can't comply with the charging requirement

(2) Solution: a. Use the original charger.

b. Charge the battery after it automatically powers off , then full charge the battery.

c. Avoid erroneous usage of battery, such as heavy pressure, short circuit, fall off and so on.

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Q: Why might your IBM ThinkPad T40 battery not charge?
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