Again, this isn't my area, but conventional ICE vehicles are typically a total loss if they need the entire engine & gas tank replaced. So, again, I am sure I am not totally correct/wrong here in the entirety but my point was just that:

> Except for the battery and motor, almost every technology in the car is what you'd find in a regular vehicle.

This statement I found funny because it was stating that the core technological difference between ICEs and EVs was the energy source and the motor. Again, I didn't mean to be insulting here, it's just like, no one thought it was the windshield wipers, so I made a joke about it. However, this second part:

> Any obsolescence can be dealt with by a battery upgrade (motors are a century old technology, I doubt that'll improve much in 5-10 years).

I am highly suspect of. Again, I have no reason not to believe you, but realistically you would have to get the battery from Nissan as it would be prohibitively expensive from a 3rd party and likely void the warranty. Hence why I said a fun software project but not something an average user would employ as the core battery pack[0] is buried under the entire enterior and interfaces through wht are almost certainly proprietary connections and closed API/systems.

Also, and again this is going on statements made by Nissan which are self-serving[1] Nissan is swapping 5 batteries a year and recycles 15-20. So I was simply pointing out that if we back out the 2016 statistic back to when Nissan launched the leafin Dec 2010, they would be somewhere around 6y * 5 = 30 replacements span of the fleet. So, I was just poking a bit of fun in jest at what you sort of intimated was just a casually routine procedure.

Again, you are correct[2], like they do have a battery replacement program and you can rent/pay to be in it as of 2014. I am just pointing out that these are the core differences between ICEs and EVs.

> Given the same electrical interface, dimensions and a compatible BMS, swapping out for a lighter, cheaper battery IS trivial.

Again, after reading this, I realized you could be trolling. Like, of course that's correct, if you take away the proprietary elecrical interface which is likely hardware/connections AND software based, found/built a compatible BMS, e.g. the core Battery Management System of the deeply integrated cell chemistry with the electrical internals that support it and likely interface with a larger system at the pack and vehicle levels...and you take apart the entire interior of your vehicle to get at the battery which is under all 4 seats and the carpet...disconnect all the wiring which runs throughout the entirety of your car...then remove the 480lb pack and get at the 192 subcells...

then yeah, it's like super trivial. So easy a caveman can do it. But again, I was just sort of having a laugh (not at your expense might I add) at how you just sort of casually imply that except this super (unique/difficult/X) stuff then Y is essentially trivial. But it's not a big deal, I just wouldn't imply it is as common place as you did.

[0]https://en.wikipedia.org/wiki/Nissan_Leaf#/media/File:2013_N...

[1]https://en.wikipedia.org/wiki/Nissan_Leaf#Battery

[2]http://www.autoblog.com/2013/06/20/nissan-leaf-battery-repla...