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Some activities drain the battery faster than others. Alternating between activities that have significantly different power requirements changes the rate at which your battery laptop computer uses battery power. This can introduce wide variations in the estimate of how much battery charge remains. The time remaining on the battery meter depends on what you're currently doing and is likely to change depending on what you do next.

Think of your laptop computer as a car and the battery meter as the car's fuel gauge. The faster you drive, the more fuel your car's engine consumes, and the fewer miles you can travel on a tank of fuel. Similarly, doing things on your laptop computer that require lots of power drains more power from the battery. As a result, you will be able to do less on a full charge.

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