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Some systems may disable the battery if the bottom storage bay cover is removed - Acer Community
<main> <article class="userContent"> <h3 data-id="why-will-my-system-not-power-on-after-upgrading-the-hard-drive-or-memory">Why will my system not power on after upgrading the hard drive or memory?</h3> <p>The bottom storage bay for the HDD or SSD includes a switch that detects whether the cover is present. If your system will not power on after upgrading the memory or the hard drive, make sure the bottom access panel is properly secured to the system.</p> If you are still experiencing a problem, please <a rel="nofollow" href="http://us.acer.com/ac/en/US/content/support">contact Acer support</a> for further assistance..<meta content=""></meta> </article> </main>