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Obviously, the alternator and battery should be tested by someone who knows what he's doing. Asking an auto parts store to test a battery is like asking a barber if you need a haircut. The cables should be carefully inspected along with their terminals at both ends. Lastly, the current draw of the starter should be checked.
The car should also be checked for any parasitic drain. In older models, for example, a back wiper that fails to park sometimes drains the batteries.
Without going through the proper diagnosis, you'll just be throwing more parts at the problem. I really doubt your problem is the battery.
Was driving around the blue bomber about 3 weeks ago and noticed it was hard starting. After running a few errands it finally died. Lights would come on, but the engine would not turn over. I got a jump and went directly to the auto parts store. They replaced the battery, and the guy that did it told my wife the Ford batteries are junk. Anyway, everything has been great for the past 3 weeks, until this morning. The wife jumps into the blue bomber and nothing, no lights, no nothing. I put a meter on the new battery and it read nothing but zeros.
Has anyone else had any issues like this? This is starting to make me nervous, we bought it used with about 45000 and the only other issue we've had was the rear limited slip clutch packs had to be replaced.