# ESP32 Thing Plus WROOM & LiPo Batteries

**URL:** <https://community.sparkfun.com/t/esp32-thing-plus-wroom-lipo-batteries/41450>\
**Category:** Power\
**Created:** [February 3, 2021, 3:24pm UTC](https://community.sparkfun.com/t/esp32-thing-plus-wroom-lipo-batteries/41450 "2021-02-03T15:24:16Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![sghetkat](https://avatars.discourse-cdn.com/v4/letter/s/48db29/32.png) [@sghetkat](https://community.sparkfun.com/u/sghetkat)\
**Post date:** [February 3, 2021, 3:24pm UTC](https://community.sparkfun.com/t/esp32-thing-plus-wroom-lipo-batteries/41450/1 "2021-02-03T15:24:16Z")

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Hello,

I’m new to this forum and the boards, so I apologize if this question has been asked multiple times before (I wasn’t able to find an exact answer).

I’m using the ESP32 Thing Plus - WROOM board: [https://www.sparkfun.com/products/15663](https://www.sparkfun.com/products/15663)

1. In the documentation it’s specified that the max operating voltage is 3.6V, but also it links to single cell LiPo batteries with 3.7V OCV. So just to be safe, I wanted to check if the board regulates the LiPo voltage to make sure it’s within the operating range? If not , what other LiPo batteries would you recommend using?

2. How would you recommend to keep track of the battery voltage during use to prevent brownouts? (ex. the ranges of 0-100% voltage to send battery percentage to a phone app through BLE)

Any help is appreciated,

Thanks!

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**Author:** ![TS-Chris](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-chris/32/6057_2.png) [@TS-Chris](https://community.sparkfun.com/u/TS-Chris)\
**Post date:** [February 3, 2021, 4:05pm UTC](https://community.sparkfun.com/t/esp32-thing-plus-wroom-lipo-batteries/41450/2 "2021-02-03T16:05:11Z")

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Hi sghetkat, thanks for posting!

The Thing Plus WROOM has a voltage regulator on it that takes a lipo’s 3.7 to 4.2 volts and drops that down to a steady 3.3 volts to keep the board happy. If you wanted to be able to monitor the batteries charge status, you’d need to connect something like our [[LiPo Fuel Gauge](https://www.sparkfun.com/products/10617) between the battery and the Thing Plus and then write a bit of code to have the Thing Plus query the Fuel Gauge for the batteries current status.]([SparkFun LiPo Fuel Gauge - TOL-20680 - SparkFun Electronics](https://www.sparkfun.com/products/10617))

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**Author:** ![sghetkat](https://avatars.discourse-cdn.com/v4/letter/s/48db29/32.png) [@sghetkat](https://community.sparkfun.com/u/sghetkat)\
**Post date:** [February 3, 2021, 4:10pm UTC](https://community.sparkfun.com/t/esp32-thing-plus-wroom-lipo-batteries/41450/3 "2021-02-03T16:10:07Z")

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Hi @TS-Chris,

Thank you so much for the quick reply!

I will look into the Fuel Gauge option as well 🙂