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Battery life (capacity) decreases with age and usage of battery - ThinkPad
Capacity is the length of time you can run your system on a fully charged battery.
It is normal for all batteries to lose some capacity over time.
Each time you discharge and recharge your battery, you will lose a very small amount of this capacity.
You may also want to check for specific information on your system;
Example: some BIOS updates include power management enhancements.
Other systems have specific tools to help with battery life.