The T-800 Terminator is powered by an nuclear power cell (or nuclear-energy cell), located in the same approximate position as a human's heart, and is shielded in a case-hardened subassembly inside the triple-armored Hyperalloy torso.
It could last significantly longer than this if the unit dropped off-line into economy mode. In this mode, power was cut to 40 percent of nominal function.
Compact energy sinks collected and stored excess energy for later use, optical systems switched to infra-red only and motivation units lost 40 percent of hydraulic pressure as the pumps slowed. Combat situations notwithstanding, the T-800 has a functional period of 120 years on one power cell.
- The T-800 of version 2.4 has a functional period of 120 years on one power cell under normal condition.
- The T-900 is also powered by nuclear power cell.