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Introduction |
| This guide will show you how to replace the CMOS (complementary metal oxide semiconductor) battery on your Lenovo ThinkPad T490s. | | You may require replacement of this piece if your laptop quickly loses its charge or does not hold charge. A dead or failing battery may be resolved through replacement or use of the troubleshooting symptoms and solutions list from [link|https://support.lenovo.com/eg/en/solutions/ht080185-troubleshooting-battery-issues-thinkpad|Lenovo Support Forum|new_window=true]. | | You may require replacement of the CMOS or coin cell battery if the laptop's setting setup randomly changes, the clock resets on its own, “Booting Error” messages appear, or the laptop runs slowly. | | | Before one begins, make sure to power down your device and disconnect from any external power sources. |
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