"The pistons that most people assume to by hydraulic actuators might not actually be hydraulic actuators. They may be an extremely evolved form of electro-linear actuator; a linear electric motor."

"Yes. But is that based on day-to-day operations? How much extra juice will it take for the amazing feats the terminators perform?"

"True, I'm sure that was a maximum duration estimate; however, even with vigorous activity, I should think that no terminator ever lives long enough to worry about total fuel-cell depletion. Even if a given unit was to consistently use double the power necessary to perform basic functions, it would still presumably last for 50 years, which, again, no active terminator will live to see. "

"Response time on a linear electric motor is almost instantaneous upon the introduction of an electric current to the motor's coils."

"
Now, what if the inside of the terminator 'bones' were hallow and had some sort of a carbon nanorobe/muscle?
We've seen those, what we can assume to be, wires or some sort of pressure/hydraluic lines running from the terminators, most prominently at the shoulders. Maybe they are coated in some sort of nanomaterial to keep them from tearing."

"You seem hooked on the word nano and keep going back to it, Forget it, they are robots . We have seen after they walk out of blast furnace temperature fires they do NOT rely on any organic muscles or tendons to function or for strength. They are more simple than not. Their fast growing skin is what made the T-800 a better infiltrator, and what makes them closer to human appearing."

"Cause nano is the premier word/theme/meme for making make believe sound pseudo-scientifically possible!"

"Cause nano is the premier word/theme/meme for making make believe sound pseudo-scientifically possible!"