I see everybody make batteries here lately, so I desided to make one too 
looks okay, but there are a few things to improve. you can watch the tutorial on blendercookie.com if you like.
Hey maybe we can start a battery competition. xD
I recommend giving the battery a little reflection…makes them look nice I think.
Did you get the nuclear cell Idea from my battery’s name?
Btw I like your metal reflection texture:)