Most laptop users have encountered a situation where Windows shows 2 hours of battery life left, then five minutes later it jumps to 5 hours or even 1 hour. Why does this time jump around like that?
Using a laptop with an external monitor is a great combination for productivity and getting work done. But over time, you may find that your laptop suddenly runs out of battery quickly and the battery life starts to decrease.
The gap between advertised battery life and actual battery life can vary due to a number of factors that manufacturers do not always highlight.