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why! N240BU CMOS Battery Replacement
Felice Suglia and 2 other contributors
Last updated on Sep 2, 2026
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Community-Contributed Guide
An awesome member of our community made this guide. It was not created by iFixit staff.
Introduction
Go to step 1 ↓Use this guide to replace the BIOS (CMOS) battery on your why! N240BU laptop, for instance if the clock or BIOS settings keep resetting.
What you need
Parts
Tools
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Start by unlocking the right locking latch.
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Then, by simultaneously unlocking the left latch, lift the battery out of its socket.
Ask FixBot
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Begin by spotting the dummy memory card.
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Then, remove it and put it on your workplan.
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Locate the 15 screws that hold the bottom cover of the device in place.
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Unscrew them and place them on your work surface.
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Then, un-clip the bottom cover, starting with the side shown in the third picture.
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Press with a screwdriver in the red circled area to spread the base of the battery
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Remove the battery by holding the screwdriver down
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To reassemble your device follow the following instructions in reverse order
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