Just saw your video talking about "double bobs"? to secure the battery? I need those I think!
Video is "Custom E-bike build: trek Fuel EX5 Full Suspension Bafang BBSHD 48v 1000w mid drive"
I have a wobbly battery. It's getting worse than when I installed it. Frankly I forgot how it goes in (wasn't there a slider to hide the bolts?), I'm afraid to pull too hard to remove it and break something.
Double bob and the Triple Bob make a big difference when securing the battery to the frame due to the hose clamps that secure it to the Downtube. If you battery is wobbly, yes get one! It does add 1-2 cm of depth so make sure you have the space for it.