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1) There's only two main manufacturers of car batteries in North America: Exide and Johnson Controls.
2) 99% of the brands you see are made by these two companies.
3) The batteries are built to their specs, so yes, that cheaper battery is actually built worse, that's why it's cheaper!
4) CCA isn't the whole story when it comes to batteries as a very high CCA battery is usually very fragile in construction and sensitive to heat.
5) Alternators need to be physically larger to output more power without losing power at lower shaft speeds (i.e. when idling). If it's not charging at idle, it's not doing you a damn bit of good. Ultimately, if you want your crazy system you need to build your electrical system to handle that in some way (usually adding extra batteries and being smart about turning the system off so everything can charge).
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