I would imagine you built this battery? - very fun to build your own battery as you get to pick your cells and BMS and you can do whatever you can fit in the custom space. I agree on the heatshrink battery as you are not loosing space to plastic cell holders.
I know the plastic case battery is...
Epic build on this, this is what i want todo do you have any idea approximate cost of all of the components cost minus the cost of the frame?
I am not sure whether to do the same with the E22 frame or wait for the E55 because the battery compartment is larger with some other changes