I recently replaced my Bosch batter because my alternator went out and over charged it... RIP Bosch Miata friend.... with that said, I did quite a bit of reading and searching. I did not want to spend $200 on a braille or $150 on another bosch battery. I found Shuriken batteries. I have a sealed Shuriken with 850cca that cost me $69 shipped, and it is tiny and works great. gl