apparently Advance Autoparts now sells a variety of auto lithium batteries
talked to a BMW guy today who has one in his track toy
https://shop.advanceautoparts.com/we...ithium+battery
4# and 500 CCA and $130
NA OEM is 300 CCA
two of these in parallel will work great for my Z06 and save 30# off the nose up high
2009 MX-5 STR and track toy
2003 Z06 -- Not a Miata, but 3200# and 400 RWHP is fun
OTM -- 2012 Sierra, 2016 Impala (Appliances)