Part one can be found here.
(the psuedo-science seems off to me. The arc reactor is, well, a reactor. I'm not that sure what exactly the logic behind it is, but I'm pretty sure it's not a straight-up battery and generates power, not stores it [this is newer, though. i think some of the older ones have something more akin to a battery node in his chest]. As such, when issues arise such as "low power," I think it means more that the power usage is greater than the reactor's power output. I'm not entirely sure if there's some sort of energy storage mechanism in his chest reactor or not. Still, a not-bad fic, and definitely worth the read if you've read the first few and would like to see a deepening of the pre-slash [though some of the earlier ones seem to barely qualify for pre-slash])
(EMH-verse. I read it once before watching EMH and some of the characters I didn't know, but I think the general gist still translated over. Still, it does make a lot more sense when you read it after getting past that part in EMH)