[FPT_RAIDER]

nope batterys them self can get internal shorts, which can keep them from working right, the 13.6-14.2 volts says your alt is working fine, there is a chance that you have a parasitic draw, either something being left on, or a fail component that is creating a draw that kills your battery, also do you have a optima??? cus that changes a lot

 

[FPT_RAIDER]

just because you think all systems turn off doesnt mean that they all are truely off, and from a quick look at the optima site it would seem you would be better off with a yellow top.......... thats just i what i read, also i would read up on how to test for a parasitic draw, its to late for me to start that lol