Introduction
The battery is perhaps the easiest component to replace here. No screws required.
What you need
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Weighing in at an enormous 7 and a half pounds, this big black brick is definitely one of the thickest of the ThinkPad line.
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Pull the battery tab up and forward.
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(You can also just follow the printed instructions on the battery itself.)
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Pull the battery out.
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You may have to pull quite firmly to get it to budge.
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Conclusion
To reassemble your device, follow these instructions in reverse order.