I do not believe battery anything will replace good ole throttle power. When my Ariens 28dlx 291 gas blower hits more white stuff it gruffs and says oh yea and eats it even harder.
Not so with batt power it can not absorb the extra shock and readjust for the load just keeps at the speed it was but is draining power a lot faster.
What I see as a huge problem is that heavy snows are usually associated with storms that may leave you without power, the power that is needed to charge the very battery that is needed to run the battery operated blower or as I call them (BOB).
so as long as I have gas I can blow snow no matter if I eating by candle light or burning more tree's in the wood stove that they think they are saving.