Ohmy^^^^inggod, not another thread about T-this and T-that. This has to stop. But until it does, I'll jump in.
I think the 50 is only explained by Arnold in the morgue as referring to his upgraded subroutines. "Basic psycology is among my subroutines... Anger is more useful than dispair." There was never any reference to him being tougher.
According to whom? The T-800 in T2 rerouted to his backup power after the T-1000 impaled the first with the rod, so it's likely he also had two. Two power cells was never suggested in T3 as part of an upgrade, just a fact of Terminators.
WTF is a TOK-175?
Why does everybody make this mistake over and over again? When Kyle is educating Sarah in T1, he calls the Terminator "an infiltration unit", and then goes on to talk about how the 600 series had rubber skin and was easily spotted, but that the 800s were new and looked human. ^^^^ McG and all his bull^^^^! The only difference in James Cameron's T1 universe between the 600 and 800 was rubber ^^^^ing skin. Kyle spelled it out pretty clearly, but everybody keeps adding crap between the lines. 600 and 800 are no diff except the skin. McG can suck it.
You are right about Arnold calling himself a T-101 though. That was bad dialogue. As a machine he should have referred to himself as a T-800, Cyberdyne Systems model one ZERO one.