CYD 2.8 inch ESP32 Marauder/Bruce Battery Upgrade Kit

Will not work with the Capacitive CYD versions. Those end in C not R. Purchase the R version. You can flash 1.6.1 here 

Marauder Firmware

Don't want to mess around with soldering battery leads and GPS modules? Neither did I. This mod chip lets you add a LiPo battery, battery status over I2C, and GPS to your Cheap Yellow Display with zero soldering. Works out of the box with the ESP32 Marauder and Bruce Firmware.

V2.0 Board Comes With:

• 2 Wires from PCB to CYD Board
• GPS Antenna (IPEX1/UF.L connection)
• PCB Charge/GPS/Battery Level Circuit

Note: The battery is not included in this kit. Please refer to the battery links below.

Battery Links

Any 3.7V lithium battery with a JST 1.25mm connector will work. If you need help finding one, here are some links! Verify battery polarity before plugging in! (Red is +, Other is -) MAX BATTERY SIZE 5.6cm x 3.5cm x 1cm for my case

• Single Battery (QTY 1): 3.7V 1100mAh Lipo - Amazon
• Four-Pack (QTY 4): 3.7V 1100mAh Lipo - Amazon

Video Tutorial

Follow step-by-step instructions with ease! Watch the YouTube Tutorial

3D Printed Case

Want to print your own case? No problem! Download the Case 3D Model

Why Choose This Upgrade?

This kit is designed with accessibility in mind—no soldering required, making it approachable for all skill levels. The custom PCB eliminates the hassle of complex connections, soldering, and researching. If you don't like soldering battery leads, you'll appreciate this upgrade.

I hope you enjoy this mod as much as I enjoyed creating it! If you have any questions or need support, feel free to reach out.

GPS isn’t working?

If you have trouble with GPS locking, you’ll unfortunately have to leave your dank crypt you vampire. Cell phones have spoiled us by making us think GPS should always work indoors when really a phone is using a combination of cell tower triangulation, WiFi, and GPS antennas to acquire your position. That cell phone technology is A-GPS. This board is purely GPS and for it to work, it needs an unobstructed view of the sky. It can work in a car though! It’s the same story with fancy Garmin GPS trackers too. So go outside! (Yes you can wait until it’s dark 🧛♂️)