CCA Requirements? Options

[Literati914]

I'll be picking up a flooded cell lead acid battery soon (budget oriented battery for a rear trunk relocation) and have been leaning towards a group 51R battery. I like this size because they are small - think Mazda Miata, small Honda Civics, Nissan GT-R, IIRC. However, I think the original group 34 had around 700 CCA [is that correct?] and the 51R tends to have a little less (425-/+). The first engine will be a 1.7, but then I'll probably upgrade fairly quickly, possibly before the typical battery dies.

I sort of recall the CCA demand being dependent on the needs of the starter.. or something like that. Anyone know for sure what our starters require, amp wise? And/Or Will the 425 CCA work?

[Superhawk996]

AGM without a doubt.

Can mount in any orientation. No corrosive off-gassing.

[porschetub]

AGM without a doubt.

Can mount in any orientation. No corrosive off-gassing.

(IMG:style_emoticons/default/agree.gif) 100% ,no conventional battery can match them ,they hold a strong residue for long time ,compact , low weight and compact .
Downside for me was the 5mm terminal bolts and my smart charger won't pull them back when voltage drops back too far but I have a convention low amp charger that sorts that issue and usually I can get full voltage back in an hour or so .
First Vision brand I had lasted 4 years but an accidental short finished that one off and expect it would a lot longer life otherwise ,the replacement was dimensionally the same but slightly higher amp hour rating.
This current one is a Ritar RT12240EV 17KG 7''high ,7''wide and 3''deep ,this one is now 3 yrs old and still going strong , these are an EV/golf cart/mobility scooter rating but my starts my six easily over and over again , really amazing performance and cost wise not expensive ,I payed $140NZD .
I built a custom bolt in battery tray with CDI mounting for my application.
In summary you just can't go wrong but IMO you need to have a well tuned engine ,good alternator ,starter and loom with whatever you replace your battery with ,cheers.