A little birdy has informed me that I may be getting a new car fridge for my upcoming B/Day. <img border="0" title="" alt="[Smile]" src="images/icons/smile.gif" />

I don't know the brand (Engel), nor do I know the capacity (40 Litre) and I wouldn't have a clue what ampage it draws (Max 2.5 Amps)!

Needless to say, this new fridge will require a new dual battery system <img border="0" title="" alt="[Wink]" src="images/icons/wink.gif" />
Based on the above lack of info, what second battery would anybody recommend, and why?
I'll do the prep work re mounting etc, but I will leave the wiring to an autolec.

Thanks in advance.
Neil