GD-77 18650 battery pack

thingiverse

<B>PLEASE NOTE: I do not present this as a full function replacement for the OEM factory battery pack. Any use is at your own risk. This design was simply a method to house two 18650 batteries. No consideration was given to addition of battery protection circuitry.</B> Having said that, I did revisit my build & later incorporated a BMS board ( I used this one https://www.amazon.com/gp/product/B0842Q1F68 ). It is a tight fit, but does fit inside the pack on top of the batteries. You have to route your connections properly. I used AWG 20 silicon wire for the BMS connections. Zvones52o did the heavy lifting with his battery eliminator back piece for the GD-77, I just made some mods in Tinkercad to accommodate addition of two 18650 batteries. My version uses threaded inserts for screwing the parts together & holes are roughly sized for using inserts for 3mm flat head beveled screws. Electrical contact points for charger & radio are made from nickle plated strips intended for spot welding batteries into packs. A dollop of solder creates a raised area for the contact. You may want to explore alternative approaches. The tinkercad workspace can be found here: https://www.tinkercad.com/things/gwjK4Wsbj8v