Anyone with a first generation miata knows the issue with batteries: you need a tiny one! I was faced with a last minute need for a battery. Trips to the auto parts stores left me with BIG car batteries. WAY bigger than I needed. I decided to see what Wal-Mart had and ended up with a lawn tractor battery. It has 350 cranking amps, which is way more than needed. It was the exact dimentions of the old battery, but had different terminals. I ended up running a new wire for the + terminal and was able to bolt up the -. It fired on the first crank! Woohoo!