A laptop battery should last for about 2 to 4 years. Eventually your battery will need replacing. This process is very simple and can be achieved by following this guide.
No tools required.
Ensure the laptop has been properly shut down and unplugged.
Turn the computer over so that you can see the battery release tab located near the top of the Thinkpad.
Use your finger to slide the release tab to the unlocked symbol.
Hold the tab in the unlocked position and push the battery away from the computer to remove it.
Slide the new battery in until it clicks.
Ensure that the release tab is in the locked position.
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