They absolutely are frauds. Every time someone comes up with some new "breakthrough" like this, whether it's a new motor, or a new internal-combustion engine,

They absolutely are frauds. Every time someone comes up with some new "breakthrough" like this, whether it's a new motor, or a new internal-combustion engine, it's a scam. Also, I'm giving a lot of "salt back" because I'm an electrical engineer, so I can see how all this stuff is total garbage. You're obviously not. I've even worked on 3-phase "DC brushless" motors and their controllers, so I do know what I'm talking about. This stuff about not needing a DC-DC converter is BS. Of course you don't need a "DC-DC converter" if your motor is AC, which every motor without a mechanical commutator is. You still need some type of power control circuitry to drive the motor; you can't hook it up to a battery! >Every time I've replaced my car battery, it's been because one cell failed after I let it deep discharge. Except once where 2 cells failed. If you did a deep discharge, the other cells were degraded too, you just saw the cell that failed first. >But you don't have to use that bus architecture. It's mechanically simpler and more robust. Yes, actually you do, unless you want to have ridiculous currents at only 4.2V going to your inverter, which would be stupid because you'd need bus bars and would still have high resistive losses. This is the whole reason we have batteries with series-connected cells instead of parallel-connected cells.