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Lenovo ThinkPad T420 Battery
Your Lenovo ThinkPad T420 battery allows you to move freely about which gives you the opportunity to use it anywhere you please. The larger the battery, the longer it will last when fully charged. Because no battery is the same, make sure and double-check the model number and compare it to the old battery. Buying a battery with a higher milliamp rating is fine, as it signifies that the battery can last for a longer period of time on one charge. What really is critical to a battery fitting your laptop is the actual size of the battery and the connection it has.
Signs the li-ion battery is in dire straights
- The laptop does not turn on when it is not plugged in
- The laptop does not last longer than 45 minutes while using the battery only
- The laptop battery is puffed up like its about to burst
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