What you have to do is avoid the _car_ industry information about the batteries.
Here's the relative scoop on most well made lithium batteries.
1) Energy density is somewhat related to heat, but as long as you're not dying, they're not dying. If they get too cold (freezing and below) then the biggest problem is the electrolyte structure crystallizing (that's the best way I can put it)
2) A standard lithium-ion battery, that is LiPo and similar, has roughly 500 charge cycles before it starts to noticeably lose total energy capacity. Something constantly trickle charged may not show the effect as badly as something that gets discharged a decent amount regularly. So, if you have a car with a 200 mile range, and you drive 20 miles a day - don't charge it every night. Charge it once a week. That gives you a 60 mile buffer to use for the 'cool the battery' 'heat the battery' etc. A once a week charge would mean that you could get ten years of driving out of it before the battery shows significant wear. (theoretically)
At 1000 charge cycles, you're likely to be down to 50% of your original capacity.
3) Fires. This is usually a function of physical damage to one or more cells. That's why most of the batteries are built in 'blocks' of cells, which the system can isolate if they start getting unbalanced. (physical damage includes a cell going into reverse and being back charged, which makes it heat up rapidly - then pop. ) I'm not going to get into what kind of damage, because it's all over the place, based on the location of the battery. The ones that aren't physical damage, are caused by poor processing of the substrates, which happens in cheaper batteries.
4) Temperature. If you don't park your car on the street all day, in the sun or snow, and keep it in a garage or under cover most of the time, the temperature isn't as big of a deal on the electronics. This is also why even the EV's have coolant pumps and coolant. It's both for heating and cooling - of the batteries. You're a secondary consideration
Does that help?
Want a Tesla that lasts (well, at least, the battery lasts, the rest of it will rattle and fall apart) 10 years? Light driving, charge it slowly at night unless critically necessary, and do full discharge/recharge cycles. If you have an EV that you have to do 200 miles a day in, every day? You may be on the "replace the battery every two years" channel.
(Edit - forgot to explain why I know this thungas. I'm an IT consultant, and I've been working with tech batteries since phones still had lead acid and NiCd. That 286 laptop from my uncle was really interesting to take apart.)