This has been covered ad nauseum and never has concrete evidence been presented that Lithium 12v batteries last any longer let alone the 3x longer required just to break even. Nor do they provide any advantages during their operational life over the $138 OEM battery. To the contrary, if you end up with issues with your 12v system while using an aftermarket 12v battery Tesla can void the warranty of related components citing the battery as the cause.
In a Tesla, all a 12v battery does is run small accessory devices like the MCU, headlights, interior lights, turn signals, etc. Compared to what the 12v battery is required to do in an ICE car (think starting the engine at very cold temps) to say this is "light duty" doesn't even fully capture the difference between these two applications.
Not to mention the Tesla keeps the battery at optimal SoC even when not running whereas an ICE car requires the engine be running to charge the battery via the alternator. Whenever this accessory isn't spinning the battery is discharging all-the-while. They sit for days sometimes discharging and then (in minus zero temps sometimes) are expected to provide an absurd amount of instant amperage draw to physically turn over a large internal combustion engine.
This is why the Cold Cranking Amps (CCA) is probably the most important metric when shopping for a new 12v battery... especially in cold climates. This metric means absolutely nothing in a Tesla to give you an idea how different of an application we're talking.
In an ICE car, there is no way to predict when that battery will suddenly not be able to provide the necessary juice to make the car run and it generally fails in the coldest and most dangerous of scenarios. There's too many variables and the ability to provide CCA tends to drop off rapidly once it nears the end of it's life. This isn't the case with a Tesla. The amps required to power headlights or a stereo are fractional by comparison and the car can monitor the health of the battery at a finite level. This battery health monitoring algorithm tends to err on the side of safety when it comes to warning of an impending failure and most can go weeks or even months once that warning has been issued. It's all-but-eliminated the potential for becoming stranded due to a 12v battery failure so for a few rare outlier cases.
Naturally, people are fearful of being "stranded" in the middle of the night, in the dead of winter and in the most inconvenient time possible. This is a good fear to have and it's based largely on our experience with ICE cars in which this fear is founded in reality. Manufacturers of 12v Lithium batteries prey on this fear since it's unrealistic in a Tesla. They try to get you to pay for something that will do you zero good in a Tesla and, if your fear is being stranded, could potentially even increase the odds of this happening due to the system not being able to properly monitor & manage the health of your 12v battery they way it was designed to do with the OEM chemistry.
The new cars will come with a lithium-based 12v battery but it will include thermal management & cell health management technology that was created for their battery packs. It will be properly engineered and accounted for within the Tesla electronics ecosystem unlike these Band-Aid slapped on Li-Ion 12v aftermarket "solutions" but I'm sure we'll see more and more people asking about it once the new cars start rolling out. Just know that there is a LOT of engineering resourced going into making that an OEM solution so it's silly to think you can just slap one in something as complex as a Tesla w/o any accounting for it via the firmware.
My last warranty replacement 12v battery (I'm still amazed Tesla will replace these under warranty when every other car manufacturer treats them as a "wear item" like the brake pads... I digress) they had a "newer & better version" which was similar in overall chemistry but from a new supplier. This required a change to my car's firmware to properly account for what was the same basic battery. Think about that for a minute. Do you seriously think that if changing to something as different as a lithium chemistry 12v battery you wouldn't need to account for a change that extreme in the car's management system if one is required for what basically amounts to the same battery? When I saw that even going from previous versions of the OEM battery to the newer versions required a firmware change to account for even these minor differences within the system it shed some light on how bad of an idea going with something as different in chemistry as a lithium battery for the 12v system is at any cost.
In short, anyone who says that a $400+ lithium 12v battery is an "upgrade" in any way for a Tesla is selling you snake oil. Don't fall for it.
tl;dr Stick with the OEM and file this conversation under crap not even worth wasting your time considering.