# LarkBox Pro - CMOS Battery drained

**URL:** <https://forum.chuwi.com/t/larkbox-pro-cmos-battery-drained/50018>\
**Category:** LarkBox\
**Created:** [February 20, 2025, 3:45pm UTC](https://forum.chuwi.com/t/larkbox-pro-cmos-battery-drained/50018 "2025-02-20T15:45:14Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Vichingo455](https://avatars.discourse-cdn.com/v4/letter/v/ccd318/32.png) [@Vichingo455](https://forum.chuwi.com/u/Vichingo455)\
**Post date:** [February 20, 2025, 3:45pm UTC](https://forum.chuwi.com/t/larkbox-pro-cmos-battery-drained/50018/1 "2025-02-20T15:45:14Z")

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After 2 years and 3 months the CMOS battery is sucessfully dead. The mini PC doesn’t save any BIOS change anymore, and auto powers on after i plug it (powers on, powers off, then powers on again). Can someone instruct me on how to replace it? Thanks

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**Author:** ![ChuwiESnotactive](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.chuwi.com/chuwiesnotactive/32/8190_2.png) [@ChuwiESnotactive](https://forum.chuwi.com/u/ChuwiESnotactive)\
**Post date:** [February 23, 2025, 9:27pm UTC](https://forum.chuwi.com/t/larkbox-pro-cmos-battery-drained/50018/2 "2025-02-23T21:27:37Z")

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Write to [Service@chuwi.com](mailto:Service@chuwi.com) and ask if we have still some stock but i doubt as its a quite old product

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**Author:** ![adibindrianto](https://avatars.discourse-cdn.com/v4/letter/a/c68b51/32.png) [@adibindrianto](https://forum.chuwi.com/u/adibindrianto)\
**Post date:** [December 26, 2025, 7:02pm UTC](https://forum.chuwi.com/t/larkbox-pro-cmos-battery-drained/50018/3 "2025-12-26T19:02:39Z")

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What type of CMOS battery is used? CR1220 or CR2032, 2 or 3 pins?

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**Author:** ![Vichingo455](https://avatars.discourse-cdn.com/v4/letter/v/ccd318/32.png) [@Vichingo455](https://forum.chuwi.com/u/Vichingo455)\
**Post date:** [February 19, 2026, 9:01pm UTC](https://forum.chuwi.com/t/larkbox-pro-cmos-battery-drained/50018/4 "2026-02-19T21:01:44Z")

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Mine came with a CR1220 3V.

Anyways I’m just using that mini PC CMOSless. It just powers on when I plug power and stays powered on, easy. With a RMM I can eventually power it off (I’m using it as a little server box to compile software).

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**Author:** ![adibindrianto](https://avatars.discourse-cdn.com/v4/letter/a/c68b51/32.png) [@adibindrianto](https://forum.chuwi.com/u/adibindrianto)\
**Post date:** [March 4, 2026, 4:34pm UTC](https://forum.chuwi.com/t/larkbox-pro-cmos-battery-drained/50018/5 "2026-03-04T16:34:56Z")

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I’ve tried removing the charging cable and battery, but the device doesn’t turn on automatically when power is connected. I’d also like to do the same to use it as a home server. Can you help?