I'm curious here, what makes it so handy? I could picture it on a Dominator constantly burning outdoors and shielded, but the Mav tends to operate in areas where you have power available all over the place between your own batteries, the boxes, the ones in buildings, the various charging points, and the ship/SRV eventually. Since popping the consumable is instant, I never thought about that mod but you obviously see it differently.
Here I finally got the backpack on the Mav, and it's a massive QoL for the compulsive looter, haha. For the rest, I'm thinking of NV for sure, but after that, I'm torn between Improved Jump, Quieter Footsteps and Longer Sprinting. That's 3 for only 2 spots, decisions decisions... Anyhow, plenty of time until I have the G3 upgraded to G5 and the engies unlocked for all the mods.