Modding my DMG-01 (Original Classic Gameboy)
The original gameboy was a great product of its time, and even today it is still lots of fun, but there are several aspects where it could get even better, these aspects can be upgraded using mods, I will put here the recommended mods in a nutshell.
This is a simple mod in which I will upgrade the capacitors from 1uF 50v to 10uF 50V.
In this mod, I have added a 470uF 10v capacitor to have more speaker power
I suggest soldering to the legs of the capacitor two small wires (for each leg one wire), so you can place the capacitor in a place which will be the most comfortable for your gameboy.
Speaker Amplifier (Louder Speaker)
Buy a usb-c charging board (TP4056?) and a 3.7v LI-ION battery (1300 mah?), Make sure you have 2 red wires, 1 black and one white
1. Remove all battery connectors from the gameboy case (Desolder 2 of them)
2. Solder red+white wires to left battery connector place (after removal of connector)
3. Solder red+black to the right battery connector
4. Now connect 2 wires to the charging board and 2 wires to the battery like the picture below