A vehicle includes a chassis, tractive elements coupled to the chassis, an electrical system, and a controller. The electrical system includes an electrical load, a first energy storage device coupled to the electrical load, the first energy storage device utilizing a first energy storage technology, and a second energy storage device selectively coupled to the electrical load by a switch, the second energy storage device utilizing a second energy storage technology different from the first energy storage technology. The controller is coupled to the switch and configured to command the switch to disconnect the second energy storage device from the electrical load in response to an indication of a power draw from the electrical load.