Battery Replacement
 

Regarding the boxster battery, can this be replaced with something smaller and lighter?

or

does it have to be the same size and must it have the 'vent'?

im thinking of putting this 6.6kg battery inside the car - http://www.mx5mania.com/product607.htm

Answers:

Yes. No - but you will need to modify the tie down. No - only needs vent if a flooded cell.

Here's a link w/ some other alternative and the specs for the OEM Moll battery:

Mike Focke's Battery Guide

so it doesn't need a vent

which of these can i use for the boxster
http://www.batteryplex.com/odyssey.cfm
there is one that is 6lbs but only 100CCA

would this be possible or would i have to go closer to something 600CCA and above similar to the ones you provided in the link?

for a manual boxster s with aircon 0-40'C operating temperature

I'm not sure which one in particular you are looking at but w/ only 100CCA you'll need to be jumped every time ;)

Get one w/ at least 650 CCA IMHO