I think the main problem with the swappable batteries in CDDA is that they aren’t so heavy that a person can’t lift them (with effort), and they appear in a ‘swappable battery case’.
Basically everything about them design-wise says ‘this part should be easy to swap out’.
But the reality is that in CDDA tires and batteries are among the HARDEST things to swap out in practice, requiring more specialized and bulky tools than any other job - including entire engine blocks or nuclear reactors. 
So, yeah, go ahead and commit to that entire tear-down and rebuild of a main-battle tank. Heavy military armor plating, primary frames, 120mm gun turret - It’ll all be totally fine until you need to install a ‘swappable’ commercial electric battery. 