Cheaper lighter battery option - Miata battery
 

I needed to replace my stock battery after 4 years this weekend and rather than go with a heavy group 35 replacement I simply dropped a replacement battery for a 2016 Miata into the engine bay from Advance Auto. Battery was ~$10 cheaper and ~10lbs lighter than stock. Stock brackets hold it in the engine bay just fine even through its a little smaller.

Nice, is the CCA comparable?

it was actually higher, 410 vs 390. Now, you can get a much higher CCA group 35 battery but I don't live in a cold climate.

Thanks for this! A good alternative to say a shorai battery. Although not as much weight savings.