The OEM battery is only 85 dollars? I was going to get a Ohmmu battery when my OEM battery died but for 85 dollars I would just replace it with another OEM battery. I assumed they were 150ish
Its $85 from tesla in southern california. I believe its the same everywhere. The battery itself is $85, and if you pay for tesla to install it, that total cost (tax, everything, "out the door") in SoCal is $128 and change. Its a little different in other places as the labor rate may be different, but fully installed by tesla its $115-130.
Anyone considering installing an aftermarket battery is likely capable of installing the OEM one as well, so they could just pay the $85 and install it themselves.
Note that, There could be other reasons to prefer the Ohmmu. Some people state that audio sounds better. Its lighter (weight) if that matters to you. Its supposed to be longer lasting.
It also has its own BMS (battery management system) and twice so far since 2018 tesla has made "some change or other" to how they interact with the 12V battery that has made the Ohmmu throw false positive errors about status, failing battery. Ohmmu is testing a fix for the second time, now. There is no guarantee that this wont happen again (although Ohmmu has been very supportive to people who have their batteries so far.
There could be reasons to install this or any other third party Lithium ion battery, but PRICE is ABSOLUTELY not one., because as I said you can replace the battery every 2 years 4 times and still not get to the price of the Ohmmu battery. Thats 8 years, and still not "break even" for cost, and there isnt any reason you have to replace it proactively every 2 years, you could do it every 2.5 to 3 years and make it 8-12 years (and still not get to the cost of the ohmmu battery).
If you (or anyone) is considering an aftermarket 12v, do it for something other than cost.