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Do 4000mAH and 6000mAH laptop battery packs last 4 hours and 6 hours respectively?

 

No, laptop battery pack rated at 4000mAH can supply 4000mA current for one hour at the battery rated voltage. If a laptop computer uses 2800mA current in one hour then the battery rated at 4000mAH would  last approximately 1.5 hours. Similarly 6000mAH battery pack would last little over 2 hours.