You can repair the busted laser turrets with a repair unit, which is a battery + computer chip. You can break down the robot wreckage from the dead taser bots in the Missile Base area for batteries.
For the Hive area, bring a turret or 3 with you. I forget the key to pick them up, but you can, though you move slower with one in your hands, though if you don't deploy them they don't slow you. Regardless, drop em on the north edge, travel into the hive, and if you see ANYTHING come at you, retreat back to the safety of the turrets on the other map. Repeat until its clear, then set up a leapfrog game with the rest to leapfrog through it.
Androids seriously have it easiest, especially if Missile Base is one of the three next to the start. Battery farming can keep them going forever, even if you use a laser pistol a ton. For the humans, doing the Missile base for turrets then deploying them all in the hive can net you a massive amount of food. Remember that Humans can't use batteries anyway, so might as well make them repair units. DONT make repair units before you need them, and break any you find, since the damn things are a weapon of sorts and are one shot and wasted.