# About battery spec

**URL:** <https://forum.clockworkpi.com/t/about-battery-spec/9373>\
**Category:** uConsole\
**Created:** [January 1, 2023, 3:18pm UTC](https://forum.clockworkpi.com/t/about-battery-spec/9373 "2023-01-01T15:18:39Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![tonywang](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/tonywang/32/7380_2.png) [@tonywang](https://forum.clockworkpi.com/u/tonywang)\
**Post date:** [January 1, 2023, 3:18pm UTC](https://forum.clockworkpi.com/t/about-battery-spec/9373/1 "2023-01-01T15:18:39Z")

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I found two types of 18650 batteries, one is 3.7v the other is 4.2v, which one should I prepare for a uConsole?

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**Author:** ![yatli](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/yatli/32/6253_2.png) [@yatli](https://forum.clockworkpi.com/u/yatli)\
**Post date:** [January 1, 2023, 4:40pm UTC](https://forum.clockworkpi.com/t/about-battery-spec/9373/2 "2023-01-01T16:40:48Z")

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Same thing? 4.2v is the charging voltage while 3.7v is the nominal voltage.

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**Author:** ![tonywang](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/tonywang/32/7380_2.png) [@tonywang](https://forum.clockworkpi.com/u/tonywang)\
**Post date:** [January 2, 2023, 4:49am UTC](https://forum.clockworkpi.com/t/about-battery-spec/9373/3 "2023-01-02T04:49:02Z")

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I don’t think so, many sellers marked explicitly about the two specs.

 ![1](https://canada1.discourse-cdn.com/flex029/uploads/clockworkpi/original/2X/8/8009525cedd80b9728e5e546c41c40ad385d0a32.png)

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**Author:** ![zedr0k](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/zedr0k/32/6766_2.png) [@zedr0k](https://forum.clockworkpi.com/u/zedr0k)\
**Post date:** [January 2, 2023, 6:25am UTC](https://forum.clockworkpi.com/t/about-battery-spec/9373/4 "2023-01-02T06:25:29Z")

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I think that’s exactly what yatli said.

> [@yatli](#):
>
> 4.2v is the charging voltage while 3.7v is the nominal voltage.

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**Author:** ![MHam68HC11](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/mham68hc11/32/5046_2.png) [@MHam68HC11](https://forum.clockworkpi.com/u/MHam68HC11)\
**Post date:** [May 31, 2023, 1:04am UTC](https://forum.clockworkpi.com/t/about-battery-spec/9373/5 "2023-05-31T01:04:14Z")

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Dimensions matter! battery choice for the DevTerm is really critical - the Cells I bought are tight and the battery just barely fits and the cover is really tightly bound…