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So in the end I just went the Canadian Tire Motomaster replacement (Lead Acid).
In 2016 it was the Motomaster Eliminator and now in 2022 the equivalent is the Motomaster OEPlus. They rebranded the batteries and the Eliminator is now the AGM version. The Lead acid I got from them last time lasted ALMOST 6 years (2 years beyond warranty). So for $150 I just went with the same battery. The AGM was negligible weight savings and only a 1 year longer warranty for an extra $100. Which wasn't worth it imho.
FOR THOSE LOOKING FOR THE INFO
2003 BMW Z4 3.0i battery is Group 48
I looked at other options like Braille and Antigravity (and many others) the weight benefits for price weren't worth it. My previous goals were to be a dedicated track car but that's no longer my goal. So I just couldn't justify that money where I could use it somewhere else.
In summary when looking at Lead Acid or AGM they were about 45-55lbs depending. Ranging from $150 - 500 Canadian. The lightweight batteries being $450-$1500 Canadian.
40lbs of battery weight savings = $700-900 more than a run of the mill Canadian Tire battery. The mathematics worked out to roughly $20/lb.....there are some slightly cheaper options but don't have the Amp hours and I need that to run the accessories (ie cooling fan, water to air pump etc for the supercharger).
$20 per pound is pretty good though compared to some other research I did quickly for comparison sake:
2020 M2 CS - 3517lbs $87,495USD
2020 M2 - 3600 lbs $59,895USD
$332.53/lb
2022 M5 CS - 4089lbs $143,995USD
2021 M5 - 4345lbs $113,095USD
$120.70/lb
When you compare price $/lb compared to what BMW's charging it all seems reasonable 🤣😅🤣
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