The thing is the batteries in EV behave the same as the normal lead acid battery in your ICE car, but with other problems. When Lithium based batteries are kept fully charged it damages them ( they normally store some chemistries of lithium batteries at around 40% charged to prevent damage in storage and for longest shelf life, and as far as I am aware non are stored at 100%), if they are allowed to fully discharge you are looking at a brick and the cost of a new battery. The tales of 'batteries lasting 100,000 miles + in Taxis' are a bit misleading as if a battery is used regularly and kept within the top 50% of charge it extends its life ( just like lead acid, lithium batteries are sensitive to DoD, depth of discharge) - in early Tesla cars there were many tales of batteries failing 'bricking' due to car standing and not being used enough. Tesla fitted cars with GPS tracking and could track the battery state remotely, if their system highlighted a problem they would often go out and take the car away in a closed lorry ( Rolls Royce would also use closed lorries as it was bad publicity to see one of their cars being taken away for repairs) and fix the problem, but in early days misuse of battery was not covered in the warranty and a new battery was $40,000.
So just like normal ICE car lead acid batteries fail due to low mileage, lack of charging and overcharging, the EV batteries are the same. Also in hot places the rate of battery charge has to be reduced or it will fatally damage the battery, and in cold places battery output is reduced --- and so it goes...
Car range is also based on traveling at 50 to 55mph as well, tales of motorway speeds reducing range by 30%. So a cold, wet day on a motorway is Tesla hell..