I designed this 3S5P battery pack case for those days of long driving around when you need bit more juice than what my previus 3S2P desing can offer. It is desinged to hold 15 18650 cells and there is enough room for the wiring and a BMS (a must when building packs). It includes a cutout for a standard square rocker swich and a male XT60 connector. The fits are meant to be tight and it it doesnt quite work out giving a few strokes with a fine file and everything should fit. The switch opening is made to be loose so it can accomidate different sizes of switches (you know how Chinese QC to say the least) and a touch of hot glue will easily cover any visible gaps. The design is snap fit but you may need to use aditional glue. EDIT 29. 5. 2019: -I added the .step file if anyone wants to modify it for their own use.