ADW HC600 micro-battery, used mostly as backup juice for car subwoofer systems. 600 cold cranking amps and available at car stereo shops for around $120.

Just started mine after 5 weeks without a jump. It sits perfectly on the frame rail below the fuse block.

Thanks to nocab72 (Kyle) for the pics of his (old) setup:
http://flathat.woodstream.net/RX7/Gr...l/P5110094.JPG

http://flathat.woodstream.net/RX7/Gr...l/P5120098.JPG

Same.. I had a 51r at first in the engine bay, but it was rubbing on my FMIC pipes.

I have an O'rileys battery in the bin... it fits too. just 1/8 in too tall so I lock it and ya cant even tell... 72 month warranty to par
I've already gone through one in 4 months... but o well who cares... they're free from here on out... just need to keep going to alternate locations. Hope they don't eventually check my car for an upgraded ignition.