Battery Case for 18650 E-Bike

thingiverse

I'm going to make this really quickly because I just hot glue the top on, which makes it water-tight. The two holes at the bottom are for lights and one for the battery. Simply select the correct voltage from the battery to attach to the lights by checking the voltage, ie, group 1 = 3.6v, 2= 7.4, 3= 14.8v etc... I've printed this in PLA and TPU, but I highly recommend using TPU because it cushions the battery nicely. I use 10 x 18650 batteries connected in series and 3 in parallel to get 36 volts with a capacity of 9 amp hours when using Sony 30Qs. However, I only have 7.8 amp hours in this battery pack, which leaves room for adding more batteries on top to reach 15 or even 20 amp hours. The bottom mount is designed to fit 48 mm or 50 mm cross-beam components, commonly used in aluminum bicycles. Simply attach it with cable ties; I've made a complex mounting system, but this simple method works best. If there's too much space inside the battery pack, fill the gaps at the back and front with some material to prevent the batteries from bouncing around. The front section of the design fits most barrel connectors, so use a BMS (battery management system) for easy installation. Finally, tie the positive and negative output wires to a stick and poke it through the hole at the end.