Battery OEM Nissan or OEM Mercedes

the only time it failed me was when the battery died after 100k miles.

Crappy "genuine VW battery/parts" for you. Any of my other OEM Japanese car batteries lasted much longer. My 2011 Nissan 370z OEM battery lasted 7 years. It could've probably gone even longer if not for without driving it for long during the covid pandemic.

When you say, \u201ctwo new batteries\u201d are you speaking of the big ones? There is a small one that operate your convenience/comfort items. It looks like a small garage door battery.

I'm in central Texas and the Leaf does just fine for in city driving. The batteries run hotter than a liquid cooled battery does of course but they are capable of operating at Texas summer temperatures. Where they struggle is on long highway trips. High speeds mean more load on the battery which also means more heat and more likely to have the car limit power due to battery temps. I have noticed that Leafs in Texas do tend to show more battery degradation and less capacity than leafs that are in cooler climate.

I have a 2015 Nissan LEAF SV. In -25C or colder (and to be fair, it's rarely -25C (not counting the windchill) during the day), with moderate heat on (set heat to 19C or less) plus heated steering wheel and heated seats (both of which use relatively very little power), I can lose a good 60% of my range

they do suffer more with battery degredation due to crap thermal management (older models).

I’ve had it 3.5 years and it just started doing the “Stop Vehicle Leave Engine Running” thing about a month ago.

Our other car, the 2016 Leaf, kinda is the embodiment of all the negative talking points you hear about, since it's an older EV: It uses an outdated & slower charging standard, has a small battery, and has significant battery degradation (29%) since Nissan decided, in their infinite wisdom, to not give the Leaf a coolant loop for the batteries. (Heat is the biggest killer for EV batteries).

Exactly the same issue I am currently facing with a month old GLC300. No resolution yet

Problem I have with my 2016 is I go threw lot of batterys , first one lasted 3 years which told it comes with 3 year battery 2 one lasted 2 years ,The third one only one year..So brought to dealer. They checked connections and hooked up meter left hooked up for 2 days..It draws .07 amps when just sitting.