Because the manual is written for the lowest common denominator. People that don’t dive deeper into how lithium batteries work. There really isn’t any significant harm leaving your car plugged in at 90%, and that setting allows for decent range. Can you imagine if Tesla said "here’s your big battery car, but for best results long term only use 60% of that battery"? The media would have a field day. So yea, if you want to leave the car plugged in and set to 90% go for it, but anyone who knows anything about lithium ion batteries knows that storing them at about 50% charge is better for longevity. It won’t change the fact that batteries lose capacity as they age over time, but slows down that process a little. If you don’t need the range, keep it in the middle of the pack. When you do need the range, charge it up to whatever you need. That’s part of why, even though I leave the car set to 50% I still plug in. I can always remotely increase the charge percentage should I know I need the extra range. How often do you completely out of the blue and with no warning, need to drive 240 miles?
Been told optimal charge is 80 to 90 %. Above that is reserved for topping off directly before going on road trip.
Hi, I’m a former Tesla employee and it is recommended to charge daily; you pick—between 80% to 90%. Use a regular charging regiment and don’t drop below 20% or it will thriwb
They won’t come up with a number. They have to protect themselves. That’s why there’s ambiguity and no official documentation for customers.
It is recommended to charge between 80% and 90%. Don’t drop below 20%. The optimal would be 40% to 80 or 90. The more consistent you are with your driving and charging habits the more accurate the range estimate will be.
Well, there is the range estimate which is generated by an algorithm of which we only know a few pieces. And then there is the real battery capacity which gets affected by different factors. People have figured out in the past that charging to less than 90% may result in accumulating range estimate errors. There is also the issue of cell balancing which used to occur at 93% charge or higher, in 85 kWh times. Lack of balancing will at least temporarily result in reduced range/capacity. Charging to higher than 90% will diminish real capacity more quickly, so there are trade offs. We’ve watched Tesla adjust those trade offs over time, with preconditioning, decreased and increased max charge power and fast charge power “gate”. Recall the instantaneous range estimate changes after certain software updates. Aside from a few experts in the Tesla battery labs, some of the executives in charge and probably a few external experts no one really knows the parameters of those trade offs in enough detail to make definitive statements, Tesla employee or not. And Tesla the company will never tell us because they want to avoid the liability. All my opinion and accumulated tidbits from memory, take it as such.
Some Tesla insiders will tell you 80% while others will say 90%. You’ll get varying opinions from engineers, technicians, etc...That’s what makes it so frustrating. One engineering document states one percentage while another lists a different one. Yes, this is absolutely true. Lol. But the only two numbers that come up are 80 or 90.
Also, at this point there are so many different flavors of battery packs that what is best for one might not be for another. I think each pack size has had at least 4-6 versions during their production runs. Honestly beyond the broad strokes (charge for what you need, keep it in the middle of the pack, avoid going above 90, and below 15%) there really aren't any hard numbers, as everyone is driving on different cells.
And the reason WHY Tesla will never state a number...because EPA. Nissan did specify "recommended" SOC and look what happened. EPA takes BATTERY SAVER MODE (80%) in consideration when calculating official range. This is why Nissan disabled 80% mode a year later... only in US. ONLY..in US. And it's still missing. Idi0ts
I dont think Tesla will ever share their battery care secrets. Im sure they have detailed data on charging behaviours and impact of range. Afaik the 90% number comes from Model S community data where people noticed that the people with the least degradation are the ones who just plug in and set their range to 90% every day. The assumption is that its not true degradation for cars which charge to 80% but just an estimation error which can take months to correct on an 80% car. Out of interest, why do you think that dropping below 20% is bad for the car? All evidence we have on lithium ion batteries is that cycling 0 - 70% is WAY healthier than 30 - 100% or even 20 - 90% for battery longevity.
I'm confused. I'd thought that keeping the battery in the mid-range (50%, +/-) was ideal for longer parking periods; and staying relatively low (<~80%) was the way to go for daily driving. Sounds like you're saying 90% is an ideal target? Does that apply to storage as well? And, if per your last paragraph, going to 70% is "WAY healthier" than 90%.... I'm still a Tesla newbie, and I want to do all I can to get as much longevity out of my car. Please help me understand this!!
I confirm. I've cycled my EV between 1-7% and 80% a LOT and I have one of the best battery state in my climate.
i also do lots of long range traveling on either slow DC or just 3 phase, often cycling 70 - 0% or 80% - 0% and until the 0.20 update i had one of the best batteries according to teslafi. I could charge to like 493km until a few weeks ago. The 0.20 update reduced this to 470 km though. havnt done a full charge since then though so who knows...
we are talking about cycling. for storage probably 60% is the best given that you got a 3% hidden buffer and like 5% visible buffer on the bottom....
I think 10 - 80% is better for the battery than 0 - 80%. Plus, when you go to 0% you leave no room for detours or other issues. Just take a break and grab some food at a Supercharger so you can stay above 9%! You should be fine with 10 - 85 or 90% too.
Logistical and emotional issues have nothing to do with battery health. Let's keep them separate. 0% is actually VERY high voltage and is "healthwise" far from zero. 0-80% gives better cycle life. But difference is less than 1% capacity drop per year. So hardly matters.
of course it is. but the question is... is 0 - 70% better than 10-80%? The commet of staying above 9% is easy but not every country has dense supercharger coverage like the USA. I.e. my nearest supercharger is 1350km away. So the cars see a lot of deep cycling from i.e. 95% to 3%.