How to Calculate Laptop Battery Run Time
You can calculate your laptop’s battery life by dividing the battery capacity
(Watt-hours or Wh) by the power consumption of your laptop (watts).
Battery Life Formula
Watt-hours ÷ Watts = Battery Life (hours)
Example:
60 Wh ÷ 20 W = 3 hours
Laptop Battery Life Calculator
Enter the Watt-hours and Watts to calculate battery life in hours.
If you do not know one of these values, see the formulas below.
Calculate Watt-hours
Formula:
Wh = (Volts × mAh) ÷ 1000
Example:
14.8 V × 4060 mAh ÷ 1000 = 60.09 Wh (rounded)
Calculate Milliamp-hours (mAh)
Formula:
mAh = (Wh × 1000) ÷ Volts
Example:
60.09 × 1000 ÷ 14.8 = 4060 mAh (rounded)
Will a Higher mAh Battery Damage My Laptop?
No. A battery with a higher mAh rating will not damage your laptop or power adapter.
A higher mAh rating simply means the battery can store more energy and run longer.
We use only high-quality
laptop batteries.
All Xtend-brand batteries are backed by a 30-day money-back guarantee and a
2-year warranty. OEM batteries include a 1-year warranty.
