Overall, this was a really fun project to build. My favorite part was designing the outer enclosure and adding the cosmetic details that transform an ordinary cylindrical battery pack into what looks like a ridiculously oversized Duracell AA battery.

That said, I already have a few ideas for Version 2 of this project.

The first upgrade I'd like to add is a custom ESP32-based control board with a built-in display. This would provide real-time information such as battery voltage, remaining capacity, charge and discharge current, power consumption, individual cell voltages, temperature, and charging status. It could also be used to monitor solar charging and make the battery pack much more informative to use.

The second upgrade I'd like to explore is integrating an MPPT solar charge controller. This would allow the battery pack to function as a true portable solar power station, capable of efficiently charging directly from solar panels. Paired with a DC-to-AC inverter, the system could even provide AC power, making it a much more versatile backup power solution.

For now, though, this project is complete, and I'm really happy with how it turned out. I hope you enjoyed following along with the build as much as I enjoyed designing and building it.

Peace!