60V 50Ah lead acid, to get max battery life you should not deplete more than 50% -> 150W power for claimed 10 hours. Or 45min with the claimed top power of 2000W.
You can add 50% to those figures if you deplete to 33% level. But then need to recharge in fast order.
Wonder what they mean with single motor and direct drive 4wd... maybe that there is single motor and no gearbox, only (trans)axles driving the wheels?
Doubt it will be very quiet. All kinds of whining might be closer to truth, and even with higher frequencies that human won't hear but quarry might.
Might be OK for vermin, but definitely not for deer (stated capacities etc)