Sounds to me like he has either a bad battery or a drain on the system. They sometimes sit in our warehouse for 3 months and never have a problem. I had a blue top in my car for about 4 years, the car sat for 7 months with no motor in it. I put the new motor in never charged the battery and it fired right up. A normal lead acid battery would have been dead most likely.
Don't let the blue tops trick you on the CCA, they are rated as marine cranking amps or MCA which is tested at 80* as opposed to 0* like the CCA on the red top.
I can only speak for interstates on this but the CCA rating on there batteries is done at 0*, the CA rating is at 32*, other companies are different I don't know which ones. And as I said earlier if you see MCA its at 80*
The reds have the most warranty by far, the blues and yellows have less warranty and I see more failures from them even though I sell more reds. I will not put anything but reds in my vehicles now

. The red is also the cheapest of the bunch. An 18 month old yellow top would prorate at over $100 for example, and a red top would be free until it was 24 months old.
And as far as CCA goes come on guys. . we have two batteries. If you go with the factory 750CCA that is 1500CCA to start our 359 CID diesel. The truck I drive at work has a 466 I6 in it and only requires two 660CCA batteries.
The 750 rating on the reds is conservative to say the least. I personaly have pegged out our load tester(1600CCA) on a red top and it stayed over 10volts. Not to say they are all like that but this one was one that came in under warranty that we charged back up and retested.
Geeez thats a long post for me lol Sorry
Clark