# Supercapacitor minimum rated voltage

**URL:** <https://forum.digikey.com/t/supercapacitor-minimum-rated-voltage/45933>\
**Category:** Capacitors\
**Tags:** electric-double-layer-capacitors-edlc-supercapacit, cda-zhifengwei-technology, documentation\
**Created:** [October 25, 2024, 4:40am UTC](https://forum.digikey.com/t/supercapacitor-minimum-rated-voltage/45933 "2024-10-25T04:40:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![stevennguyen](https://avatars.discourse-cdn.com/v4/letter/s/c57346/32.png) [@stevennguyen](https://forum.digikey.com/u/stevennguyen)\
**Post date:** [October 25, 2024, 4:40am UTC](https://forum.digikey.com/t/supercapacitor-minimum-rated-voltage/45933/1 "2024-10-25T04:40:50Z")

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Hello,

in the datasheet for this supercapacitor ([LIB1840Q4R0118 CDA (Zhifengwei Technology) | Capacitors | DigiKey](https://www.digikey.com/en/products/detail/cda-zhifengwei-technology/LIB1840Q4R0118/22461738)), it lists a minimum rated voltage of 2.5V. What’s the need to have a minimum voltage for a capacitor? What could go wrong if a capacitor is discharged below a certain threshold?

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**Author:** ![Steve\_Fellman](https://avatars.discourse-cdn.com/v4/letter/s/c77e96/32.png) [@Steve\_Fellman](https://forum.digikey.com/u/Steve_Fellman)\
**Post date:** [October 25, 2024, 12:10pm UTC](https://forum.digikey.com/t/supercapacitor-minimum-rated-voltage/45933/2 "2024-10-25T12:10:16Z")

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Hello,  
Welcome to the DigiKey TechForum. This is a lithium ion super capacitor so discharging below the minimum voltage rating can cause serious damage and/or short circuit. See the last page of the [datasheet](https://en.cda-cap.com/wp-content/uploads/2023/08/Bus_Elx_DS_4019_LIB_Series.pdf) and read through the warnings for this product.