Tesla Spheres are another resource players need to plant Robotic Plants. Tesla Spheres cannot be used to plant non-robotic plants such as Peashooters. They are only obtainable at the Dr. Zomboss's Lab area where sun doesn't fall from the sky. Instead, Tesla Spheres will fall from the sky every 1 minute. Tesla Spheres look like a blue sun. They are only useable during at Dr. Zomboss's Lab since it is the only area where you can get Tesla Spheres and use it to plant Power Plants so they too can Produce Tesla Spheres. During battle, it will not write " Tesla Sphere " at the " Tesla Sphere Counter ". Instead, it will just write "TS" which is probably a short for Tesla Sphere.

Here are the list of Tesla Spheres needed to place a robotic plant :