Motor braking.

[BrianG]

Well, from what I understand (and from testing), simply shorting the motor leads puts a substantial drag on it. Try it; simply take a motor and spin the shaft. Then, short the motor outputs together and short them again. So, really, it's the motor that is absorbing the energy magnetically. I think the FETs simply apply a "controlled shunt" so there is variable braking available.
Otherwise, I would think the FETs would heat up CONSIDERABLY if they had to take that energy.

Now, if this is true (the shunting theory), I don't understand how there can be a voltage at all to get to the battery...

[zeropointbug]

Yeah, I agree with you Brian, there is a switching to the braking obviously. You can hear it if you apply the brakes and push the truck forward, it sounds like a metallicy sound switching. I've tried the shorting the motor leads too, there is alot of resistance there for sure, as all it is basically a generator with a short circuit.

Maybe we can all understand the regenerative part if we know how particularly the FET's in these controllers work. As FET's have different features. :030:

[GriffinRU]

Motor takes the abuse.

Power goes to batteries if voltage higher then... and you can skip diode drop if utilize FET's instead. And as I said it is possible, but I haven't seen one yet from known brands, except claims by Novak on brushed ESC and mtroniks for all.

If you see direct connection between batteries,caps and FET's then such circuitry doesn't exist.