LILYGO T-Energy-S3 ESP32-S3 board offers 18650 battery holder, two 20-pin GPIO headers

LILYGO T-Energy-S3 is an ESP32-S3 WiFi and Bluetooth IoT board with an 18650 battery holder, a USB-C port for charging and programming, and plenty of I/Os thanks to two 20-pin GPIO headers and a Qwiic connector.

We’ve already covered a large number of ESP32-S3 boards and products, including some designs for battery operation such as the Tokay Lite AI camera board, LILYGO’s T7-S3 board, and Smart Bee Designs’ Bee S3 board among others. But that usually means providing a 2-pin connector and charging circuitry to connect a LiPo battery, but the T-Energy-S3 ESP32-S3 board works directly with an off-the-shelf 18650 rechargeable Lithium battery.

ESP32-S3 board with 18650 battery holder

T-Energy-S3 specifications:

  • Wireless Module – ESP32-S3-WROOM-1-N16R8
    • Espressif Systems ESP32-S3R8Dual-core Tensilica LX7 @ up to 240 MHz with vector instructions for AI acceleration, 512KB RAM, 8MB PSRAM
    • Storage – 16 MB flash
    • Wireless – 2.4 GHz WiFi 4 and Bluetooth
    • PCB antenna
  • USB – 1x USB Type-C for power, charging, and programming
  • Expansion
    • 2x 20-pin headers with up to 32x GPIOs, SPI, 2x UART, 13x ADC, touch interface, Reset, 5V, 3V, GND
    • 4-pin Qwiic connector for 3V UART
  • Misc
    • Reset and Boot buttons
    • On/Off switch
  • Power Supply
    • 5V/500mA via USB-C port
    • 18650 battery holder with ADC pin (IO03) for battery level
    • HX6610S charging chip with power/battery reverse polarity protection using IP3005A
  • Dimensions – 91.5 x 32 x 20 mm

T-Energy-S3 pinout diagramLILYGO provides documentation for Arduino and PlatformIO including basic sketches for deep sleep and WiFi station mode, plus a test program for WiFi and GPIOs, as well as datasheets and a PDF schematic on GitHub. That means that as usual with LILYGO hardware you need to bring your own firmware, with the only exception being their Meshtastic-compatible boards and devices for messaging and GPS sharing.

The T-Energy-S3 is available now on Aliexpress for $16.98 including shipping, and should soon be offered on LILYGO’s Amazon store.

T-Energy-S3 18650 Lithium battery Holder

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22 days ago

I used the ESP32-C3 version of this… the LilyGo TTGO T-OI PLUS for a big project (~20 units) and it was unfortunately a bit of a disaster. There are frequent/intermittent issues with the power circuit. I haven’t been able to pinpoint exactly the issue, but on some boards there is a voltage drop between battery and the LDO – so the batteries are bled dry. I think it’s the switch over from V_USB and V_BATT but the provided schematics make it very difficult to pinpoint the issue as it’s unclear where the components are located on the board I wouldn’t… Read more »

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22 days ago

I was going to comment that I hope there’s rather more to the BMC than simply “reverse polarity protection” for a Li-Ion battery…

20 days ago

Does this board provide any mechanism for the esp to sense the battery soc or voltage?

19 days ago

Do you think we can use it always plugged via USB-C and battery in it, to have a backup in case the usb-c power supply fails?

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