LeftieBiker wrote:I disagree with three of the above.
First, washing a car that you are about to store makes it likely that rust will form in places normally get dried by moving air after the car is washed. This also includes the brakes, which should be used enough to heat them up after any washing. If the car isn't dirty, don't wash it! If it is dirty, wash it well before storage begins, and drive it afterwards.
Second, leaving the 12 volt battery connected for that long may or may not work - it's a roll of the dice. Disconnecting the battery terminals and then fully charging the battery will guarantee that it stays charged - with no top ups required.
Third, in colder weather when the battery warmer may come on, 60-80% is a safer storage charge. In this case charge the 12 volt battery but leave it connected, with ALL 12 volt accessories off or disconnected. If it appears the battery warmer may run often, consider heating the storage space just to 20F or so to prevent this.
1) you think that if you "store" a vehicle, time stops and vehicle will stop drying up? Well that is ridiculous. Driving has little to do with drying the vehicle. Car has plenty of time to get dry as it is still in ambient air. Also it's the salt that corrodes surfaces, not clean surface. Brake discs are designed to get rusty. People can't stop judging rusty brake discs, which is... pointless. Stating "don't wash a clean car" gives no new information anybody should learn.
2) There is no such thing as "that long". Procedure is for long term storage. EV or not, connected or disconnected, all batteries will deplete in normal ambient temperatures. Charging lead acid battery to 100% doesn't guarantee anything else than around one more extra week-month of storage before it reaches optimal recharge window. This thread is not for discussion of lead acid battery deeply. There are other topics full of it (and with my replies AFAIK).
3) Mostly incorrect. Battery warmer will come on not in "colder weather" but very cold weather.. with 24h average below -20*C (-4*F). That is rare for most and shouldn't be called "regular cold weather". Having any higher state of charge gives absolutely no advantages as heater will drain HV battery to optimal low state of charge (within a week) and stop operating after that. And IF very cold temperatures are going to happen then no state of charge will be enough to last conservation period. More importantly, 12V battery has nothing to do with HV battery heating as heating system is controlled by BMS which is powered by HV battery, not 12V system.
Considering heating storage place is not acceptable waste of resources with zero advantages. Same as saying Tesla should actually be plugged in for half a year for storage. Teslas have gigantic parasitic draw that will actually cost money to run from the grid. And it will still cycle 12V battery a lot, degrading it significantly (more than with daily vehicle usage).
Lithium ion batteries will freeze no sooner than -40*C (-40*F). If that temperature is unheard of then there is absolutely no reason to worry about. There is no need to keep battery warm enough so it could drive without turtle... for months and months.
Not a thread to discuss technical aspects of things that are self-evident (like store the vehicle in clean shape). Though there might be more things to do for better results.