No, I was thinking more of a hybrid that could be both, if you are on offense, you rely on your supply lines, if those get cut, you don’t want your tanks to be sitting ducks if the fuel runs out. It would be good to at least have the ability to switch at least so you can get the tanks out of harms way to fight another day.
Is it feasible now? No, but I would think it would be worth it to pursue, and we know that a lot of technological improvements do come from the military.
How long would it take an adversary to figure out that an EMP would stop our vehicles dead in their tracks?
Our modern tanks and other military vehicles are already more complex than ever before. What if China somehow took out our ability to use GPS? How many current soldiers would be confident using nothing but a map? Could our sailors keep from running aground without GPS? They can barely keep from colliding with freighters now.
As far as an electric tank, an M1 Abrams is 26 feet long (hull), 12 feet wide, 8 feet wide, carries a crew of 4 and weighs between 60 and 73 short tons. Using all the available space for fuel gives it a range of 265 miles. You would probably have to make the tank half again as long, and heavier, to add the electric outfit to it. At that point you’ve reached the point of diminishing returns IMVHO.