How Electronics Keep Accurate Time Without Power: CMOS Batteries Explained
Discover how electronics maintain accurate time with CMOS batteries when unplugged.
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Electronics keep time when unplugged using a small internal battery known as the CMOS battery. This battery powers the Real-Time Clock (RTC) chip, which keeps track of time even when the device is not connected to power. Replacing the CMOS battery periodically ensures that your device continues to keep accurate time.
FAQs & Answers
- What is a CMOS battery used for? A CMOS battery powers the Real-Time Clock chip, allowing electronic devices to keep accurate time even when disconnected from power.
- How often should I replace the CMOS battery? It is generally advised to replace the CMOS battery every few years to ensure continued accurate timekeeping.
- What happens when the CMOS battery dies? When the CMOS battery dies, the device may lose track of time and date settings, requiring reconfiguration.
- Can I use my device without a CMOS battery? Yes, but the device will not keep accurate time when unplugged, and you may need to reset the date and time each time it's powered on.