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Oh, just be aware there is not much difference between the marine and starter batteries bar slightly thicker plates. Thicker plates decrease the CCA but increase the reserve capacity and vice versa. For e.g. in NZ THE Century Yuasa M57MF (530CCA) marine battery is exactly the same batter as what goes in a EB falcon (only the top label changes and oh, at least $50 more).
I got a reply from Ctek: D250S charger is suitable for "All types of 12V lead-acid batteries (WET, MF, Ca/Ca, AGM and GEL)". It actually says so in the manual but only on the technical details page and not on the cover or on their web page.
Thanks aussiemale for your post. I'm confused. The linked battery (http://www.allpurposebatteries.com.a...roducts_id=215) is a Ca/Ca and advertised as a Deep Cycle battery (110ah, 670cca). This seems to contradict with what you said.
I also just gave them a call and they say that 20A is no issue for charging (all good as long as it's not more than 30% of the capacity (33A in this case)). They recommend it for under bonnet as it's "heat resistant".
Any thoughts?
Flo-w, you've got me confused now, checked that link and that battery is a is definitely a starter battery (over here it's either classed as a N70ZZMF or N70ZMF). Would be alright for a DC if the draw was low that it's minimal and/or the draw was less than what the alternator output is putting out under load. 20A is no issue for it because cal batteries like high amps (up to and surpassing 70amp). Heat resistant is a bit like the term water resistant that you have on watches, big difference between water resistant and waterproof.
However, go that way give the person you're buying the battery the full details of what the use will be. Have a prepared letter stating that and get them to sign it that it won't void the warranty. I personally refused to sell a customer a battery (yes, that was one of my old jobs...needed the optimas at staff rate LOL) if I knew it was going to be abused and they were just going for a cheap option. Sure I'd miss out a sale but then I'd not be the one having to put up with upset customers who's batteries died miles from anywhere.
thanks for all the feedback guys! really helpful.