There are different "strength" batteries. Their capacity is measured in mAh milliAmp hours. Under identical conditions, a 2000mAh battery will run a device twice as long as a 1000mAh battery.
Batteries age, some (like old school NiCads) worse than others. As they do, their ability to hold a charge is reduced, giving less running time. Most Laptop batteries can be repacked if they are getting old. As battery technology has been improving rapidly over the last decade or two, this can mean the repacked units have much higher capacity than the factory originals did when new.
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Batteries age, some (like old school NiCads) worse than others. As they do, their ability to hold a charge is reduced, giving less running time.
Most Laptop batteries can be repacked if they are getting old. As battery technology has been improving rapidly over the last decade or two, this can mean the repacked units have much higher capacity than the factory originals did when new.
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