Pokemon Crystal Authentic Cartridge - Rechargeable USB-A Save Battery

This listing contains an authentic copy of Pokemon Crystal for the Gameboy Color in tested/working condition. Soldered it to be rechargeable with a small Lithium Ion battery via a USB A input where the save battery contacts usually connect to CR battery. Unfortunately the original cartridge itself does have a small a hole in the top to reach the USB-A input but hey! You'll never lose your save file on the go if you don't care about aesthetics! Charges fully in an less than to up to an hour, (RED LED on USB port indicator means it needs to be charged, BLUE LED is fully charged) soldered in tightly so I've never had an issue with it. Game plays, saves and retains save file perfectly fine without any functionality issues but remember to charge it every now and again! Label remains without any wear, it's missing the cartridge screw which I lost sadly and don't have extras, cart contacts have been regularly cleaned. ANALOGUE POCKET & GB OPERATOR ARE NOT INCLUDED IN THIS LISTING!