Let me tell you I wouldn't dare buy one. My Ford SUV has a battery that costs $206. When my steering went out, my contact at my local Ford dealer said my 'Steering rack' was powered by my battery, not steering fluid and repairing that steering rack would run about $3,000. I bought a new battery, mine was 4 yrs old. Warranty over. at 3 years. Steering doing fine. N

All batteries leak. Atmospheric currents even continually draw off small amounts of power from the battery over time, which is why a car which has been sitting unused for six months can have a dead - or even unusable - battery. I have a buddy who works in Alaska as a schoolteacher for eight months out of the year but maintains a residence just down the street. I occasionally go over and drive his car around for him just to make sure it doesn't die.

And as has been pointed out by others, modern vehicles have a lot of doodads, geegaws, and thingamajigs constantly drawing power. It's really annoying because it exacerbates electrical problems and wears out the battery faster. I really wish that there was a physical "kill" switch coming off the battery which could be used to sever these types of connections until re-enabled.

The real issue here is that the primary draw on a battery for a ICE vehicle is to get it started, after which the engine - via the alternator - can replenish the battery. With an EV, there's no way to replenish the battery except to plug it in.

All recent cars do this to some extent. One of mine that sees only occasional use has to go on the Battery Tender if is sits over about 10 days. Apparently there is lots of "memory" stuff (radio stations, seat positions, garage door opener codes etc etc), that require current to maintain the memory. I replaced the battery and had to reprogram the windows!

Lithium batteries aren't even supposed to be stored, fully charged.

I have chargers for a drone and MP3 player that shut off early, for that very reason.

yes
batteries loose power over time

the deep cycle marine batteries i have for emergencies are all connected to chargers/conditioners designed to keep them full

I hate the entire idea of EVs, first because we are not even close to a pweor grid which will not collapse under their charging milions of cars. Second, they catch fire, often. Tehy are a danger to recuse personnel. I know, Commie Harris wants big yellow EV school buses, which I hope she is on board when they go to flames. I am sick that they are dumping my beloved Camaros, my husbands beloved Challenger and our daughters and ( Gibbs, NCIS) charger. Those are real cool cars. They are not bad on gas, and they do not catch fire. All we need is common sense and open pipeline, as CO2 is not the issue. We have Sun cycles and Earh cycles, which do the weather changes, and now we are seeing the Earth cycle of switcing of the poles, which could put someone under feet of ice, as it did in Antarctica. The head of GM has to be a total brain dead idiot.

I remember that cars from the 50's and 60's would have trouble starting and running when cold. Capitalism took care of that with the advent of fuel injection to replace the issues with "chokes". EV's are really too new to have all their problems solved, and maybe shouldnt even be mass produced until they are safer from fires, and tweeked in a number of ways to make them last longer. Government is trying to force manufacturers to stop ICE manufacturing for their own ideological reasons. This is stupid. let the people make those decisions. I dont even think about buying some electric thing at this point in time. Maybe later when they are perfected. For the time being, give me an ICE car that works reliably and has decent range, power, and known reliability.

ISR: Internal Series Resistance. Every device, no matter how simple or complex, has ISR. It's physics, there is no escaping it.

This is true. Batteries self discharge due to their internal impedance. It is pretty slow. All batteries do it. Different chemistries at different rates. It is pretty slow, but definitely present.

When I travel, I can leave my EV at the airport for 3 weeks and it only loses 8%.

I will never purchase an EV after my experiences with a 2012 Nissan Leaf which I have posted here in the past If the battery manufacturers are able the create a Carbon composite battery that has better overall performance and market it without carbon in the name. The Woke mob would go insane with anything with carbon in it.