I feel like for construction vehicles like this you could have a design where the battery is external to the device you use some sort of adapted fast charger designed to power the individual a piece of equipment, you can also have the battery stationary thing that doesn’t have to be lithium ion because portability is less of a concern, the device doesn’t have to haul its own battery on its treads, you could also power it off of the grid if you’re doing an urban Construction
Batteries can double as the counter weight so you don’t need steel plates.
Batteries are great for forklifts too, for exactly this reason.
For the same lifting capacity, a battery forklift is roughly half a metre shorter than a comparable LPG/Propane or Petrol/Diesel model, which really helps with the turning radius.
Also there’s the whole “frequently driven indoors” aspect for forklifts.
TIL that makes sense