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 Alarm/RS, WD pillar Guages,Touchscreen CarPC in custom console w/AutoEnginuity, 100gal polished alum fuel tank,Westin Bull Bar w/LightForce 140's