Introduction
How to replace the battery in the ThinkPad T420/T420i.
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Unlock the latch locking the battery in the laptop.
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NOTE: To remove the battery, the tab must be held in to avoid having the lock reinitiate inside the laptop.
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After unlocking the battery, remove the battery from the reverse way it is installed to remove it from the laptop.
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Conclusion
To reassemble your device, follow these instructions in reverse order.
