Planning to replace 12V in M3 with Lithium Ohmmu battery.

[grmdl3]

I'm gonna go out on a limb and say that that will prove to be less reliable than a new sealed lead acid battery from the Tesla Service Center for $85. Also an SLA is probably less likely to ignite your vehicle, though I think this particular lithium chemistry is safer than most. But if you want a project, more power to you!

Yeah, I know. I fully expect the "you first!" response.