Current Tesla defense equipment energy consumption is incredibly low, making that amount of batteries redundant, since a single (!) reactor produces more energy than both coils can use.

These values should be balanced out.
Each tesla has twice the damage of portable discharge defense, let it use the twice energy per shot - 4MJ.

And maybe halve the output of reactors and battery capacity. That way continuous teslas will measurably drain the batteries. It still will be a few minutes of continuous firing. ~4s of firing per 1% of batteries.

4 discharge defense consumes a little bit more than a 2.5 MW fusion reactor produces, so 2 MW should be enough for most interactions.