# What happens when the battery dies?

**URL:** https://community.zymbit.com/t/what-happens-when-the-battery-dies/276
**Category:** ZYMKEY4
**Created:** [March 29, 2018, 4:25pm UTC](https://community.zymbit.com/t/what-happens-when-the-battery-dies/276 "2018-03-29T16:25:30Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Bob\_of\_Zymbit](https://avatars.discourse-cdn.com/v4/letter/b/82dd89/32.png) [@Bob\_of\_Zymbit](https://community.zymbit.com/u/Bob_of_Zymbit)
#### Post date: [March 30, 2018, 4:29pm UTC](https://community.zymbit.com/t/what-happens-when-the-battery-dies/276/2 "2018-03-30T16:29:17Z")

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On the zymkey 4i, the tamper detect circuits are inactive when the battery dies. At this point, you can safely change the batteries.

Having said that, there is currently no way to know when the batteries have died. Our future Zymkey 6 will have a battery status feature.

Also FYI, nominal designed battery life is 2.5 years on the 4i.

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