4S battery pack for Headway 40152S 15Ah LiFePO4 cells.
-Careful not to pinch the balance wires when installing the covers (this is very easy to do)
-Use zip ties (slots provided) to secure caps to spacer as shown
-You can optionally add a voltage display (TopCapFancyV3P1.stl) if you have the same size display and push button SPST. Otherwise use TopCapPlainV1P3.stl
-Don't leave unattended in public or pack in checked baggage or carry-on because it looks like a suspicious package
-Be careful with lithium batteries and high-current projects like this one