Yes, you guessed it right.
It is the devices battery life.
And, laptops are no different to this consideration.
Over the past one year, Which?
tested more than 67 different laptop models to check the battery life claimed by their manufacturers.
to carry out the tests for battery life, Which?
Above it’s possible for you to see the distillation of the magazines 67 tests into chart form.
As you could see, the only manufacturer to understate battery claims was Apple.
In other cases, the tests revealed discrepancies in the battery life claimed by the manufacturers.
source: www.techworm.net