Normal
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If
the laptop battery is more than 3 - 4 years old then the battery could be worn
out. Rechargeable batteries have a finite number of charge and discharge cycles
and will lose their charge capacity over time, i.e. won't charge to 100% and
gradually the charge reduces until the battery won't charge up at
all.
OR
The battery shows a 100% charge but when the adapter is disconnected the
battery drops off to zero capacity in a very short time.
If
the battery drops to an unacceptable charge level then the battery needs to be
replaced.
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