BTW, I would not suggest replacing only one battery, the other will take the new one down. My buddy ignored my advice and replaced 1 only last summer on his 03 7.3L and we just replaced both of them this week..... If the other one is reasonable, it can be sold to recoup a few bucks.
2007 F350 SRW 6.0L Auto, 3.73LS, 172"WB 4x4.Viper VX790 Alarm/RS w/motion sensor, WD pillar Guages,Touchscreen CarPC in custom console w/ AutoEnginuity,Parrot Handsfree Blueooth,2 Infinity Amps (611A & 7541A) Alpine PXA-H701 Processor, Infinity 6010CS 6.5" components up front and Infiniti Kappa 62.7i 6.5" 2-way in rear doors, 12" RD Sonance Sub, Ranger CB w/ dual Wilson 2000's, 100gal polished alum fuel tank, 5th hitch, Rapid Hitch aluminum TT hitch, Bremen full glass running boards, painted mirrors, grille, door handles,valence,wiper arms,mount. Westin Bull Bar w/LightForce 140's