New recommendation to charge to 90% based on Like Tesla

New recommendation to charge to 90% based on Like Tesla

I wonder whether this is the best practice to charge to 90%?

Coastal Cruiser. | December 5, 2018

Wow. A 9-year-old with a post valley-girl lexicon preaching good battery practice. Aw, what the heck. Elon said so, and the video is overwhelmingly thumbed up. To cop a term from Miss Like Tesla 2018, you guy'es should check this out.

I found this comment in the video to be especially helpful. Surprising, but helpful.

"When I first started having concerns was when I saw 217 miles displayed range at 70% slowly drop to 198 miles at the same 70%. After a few phone calls and follow-ups, I talked to a battery tech at the Gigafactory that looked at my stats from the car and explained that my shallow daily charges were not enough to get a proper result from the algorithm the car uses. He recommended to not charge every day unless I really need the range and to run the car down to about 100 miles of range before charging again. I started doing that and after about 3-4 charges, I was back to displaying 217 miles at 70%. I recently charged to 100% to take a trip to the Tesla Fremont factory tour and the displayed range showed 309-310 miles after charging the morning we left. I still plug in every day for the convenience of pre-heat/cooling of the car or if something comes up and I decide to add a few miles I can use the app to do so. That requires me to take the car off a timed start charge and stop it from charging when I plug in to let the range get down to 100 miles before charging but I can't argue with what works."

JAD | December 5, 2018

That is not necessarily good for the battery, just keeps the estimate aligned better. I care more about the battery than the estimate.

jefjes | December 5, 2018

@Coastal Cruiser.- Thanks for reposting that comment I left after watching the video. I know there are plenty of owners that harp just plug it in and don't stress about it and that is fine, but I like to see the range I paid $9k for displayed and extrapolated to when charging at a less percentage. Since following that advice, it's been working that way for me and I didn't have to have Tesla do a factory reset of anything.

RP3 | December 5, 2018

@jefjes - what exactly do you mean by this statement at the end? You plug it in, but you don't let it charge? I haven't used a timer for charging, I just plug in when I want to charge.

I still plug in every day for the convenience of pre-heat/cooling of the car or if something comes up and I decide to add a few miles I can use the app to do so. That requires me to take the car off a timed start charge and stop it from charging when I plug in

lilbean | December 5, 2018

Haha @CoastalCruiser!

007bond | December 5, 2018

I keep trying to post to this but when I say what I want to say it tells me access denied.

varadorn | December 6, 2018

This comment is also helpful. "I have been on the Tesla Forum for 5 years now. We covered this issue in my first year. The issue has little to do with to what percentage you charge. It has to do with how often you do small usage and recharge. The range number is not ever what is actually in the battery. If we where to look at the actual power at any given time you would see the number change every time you hit the accelerator. The act of accelerating and regen. cause huge swings in voltage and amperage. This would confuse to many people. So what is done is a measurement of power put in and power put out. The software then makes a algorithmic guess as to what is left there in the moment. The algorithms round up the numbers in this process. This leads to a continually growing inaccurate number. The inaccuracies really increase when the car is recharged after many small trips. Only by running down low and filling up close to 100% can make this number more accurate. As you have seen a SC reset can also recalibrate the count. There really is no damage to the battery in this inaccurate count. However it is good to know what is the accurate count so every once in a while go be low 10% and recharge to 100% to correct the count. This is a good practice for people who are always doing small trips and then recharging."

Sparky | December 6, 2018

@varadorn; great info, thanks! But it still leaves the question of what is the optimum daily charge setting for long term battery life; 70%, 80%, or 90%?

varadorn | December 6, 2018

In my opinion, it would be best if Tesla can officially publish this information to consumers so that we don't have to do our own research in which we may or may not end up receiving the correct information from the internet.

thedrisin | December 6, 2018

@varadorn. If Tesla actually published various data, and there did not have to be continuous speculation, there would be no forum. More fun this way. /s

CST | December 6, 2018

Kim is cute and knows quite a bit about makeup, shoes 'n stuff, but she's a little clueless on other things, including (gasp!) Tesla. That said, I still like watching their videos and her husband has done a great job on the video production.

Revelate | December 6, 2018

Battery life issues aside: I would suggest optimize for your usage.

If you can charge daily (or super conveniently at home) set it at whatever value makes you sleep well at night regarding charging as you're unlikely to have problems.

In my case I can't charge at home, am reliant on public infrastructure or worst case a Supercharger and as such I just left it at the 90% it came from the factory with as that additional 10% might actually matter at some point.

I also use too much power, even with TACC/AP enabled so YMMV.

kichwas | December 6, 2018

@Coastal Cruiser; in late 2018 are we really attacking someone’s credibility because they sound too female?

kichwas | December 6, 2018

I charge to 90% daily, my pattern for the last month. Was doing 80% before that.

Today for the first time ever I just finished a charge to 100% to see if and how that would calibrate things.

I found the video useful for the notion of finding out if you have a range issue. If someone is seeing bad range on the display, the advice in the video will at least let you know if it’s lost track or if you have an actually bad battery...

Zidarich | December 6, 2018

In case anyone was wondering what the definition of misogyny was, CST’s post above has it pretty well covered from a variety of angles. Well done.

SUN 2 DRV | December 6, 2018

Zidarich: Not really... He didn't disparage her lack of Tesla knowledge BECAUSE she is cute and knows about makeup. He told the facts pretty much as they are self-evident from her own video.

spockagain34 | December 6, 2018

And SUN 2 DRV in with 2nd place on the misogynistic posts. | December 6, 2018

I was charging my MX to 90% and the card starting displaying warnings about battery practice, so I reduced it to 89%. 90% is OK. 80% is probably a tad better re:battery aging but not much. Range charging to 100% once in a while, like before a road trip is OK. Tesla has never been very consistent about this. I thought the Like Tesla video was helpful.

By the way, discharge current experiences wide swings depending on how you drive but battery voltage is very steady in the vicinity of 350 volts for all Teslas. If someone posts "wide voltage swings", I would view that as a sign of lack of understanding of how the Tesla battery pack operates. | December 6, 2018

Car not card--victim of poor proof-reading :-((

SUN 2 DRV | December 6, 2018

Cool, I don't mind being in the same league as CST!

jordanrichard | December 6, 2018

In almost 5 years of ownership, I have never seen a warning about charging to 90%. You might have accidentally set to perhaps 91%, becaus eanything above 90% will give you a warning.

Want to know what is best practice, look to those that have a lot of miles and see what they did or didn’t do.

Coastal Cruiser. | December 6, 2018

kichwas said: "@Coastal Cruiser; in late 2018 are we really attacking someone’s credibility because they sound too female?"

Not at all. Ask lilbean. Maybe she will explain it to you. I actually did second he recommend of the video. I admire the lady because she was using 90% of her brain being cute, and still managed to decipher that somewhat complicated looking graph pretty well with the remaining 10%.

I make no apologies for occasionally not being politically correct. I also made a post today about a new Congressperson in NY, who just happens to be female, who made one of the stupidest statements about Tesla I have ever heard. Which is saying something. I put her in the running to win, place, or show as the dumbest person in Congress. If she wins she knocks Barbara Boxer out of first place. And this has nothing to do with gender. ;>

Joho.keith | December 6, 2018

I’ve driven EVs for almost 7 years (early Honda EV, S and 3) and this topic continues to be rehashed. My experience has been very consistent. Daily charge to 80% does not degrade the battery. I can’t comment on daily charges to 100%. If 80% works for you, you are safe.

gballant4570 | December 6, 2018

Put the charge limit to the top of the daily charge section. Plug it in every day after driving. If its cold in the morning, add an hour's charge and warm up the interior before unplugging. Be sure to move the limit back to where it was before the morning charge after plugging back in.

If you are thinking about charging more than this, you are wasting your life.

CST | December 6, 2018

Yay! I've finally won something!
BTW, worth the watch:

sameer1302 | January 25, 2019

So it Looks like charging daily to about 90% is safe. BUT still is lesser the better?

I don't drive to work. (Yes we do exist, don't commute but still buy Teslas... Just to experience the future).
My average daily need is less than 50 miles.

For optimal results what option is recommended for people like me?
I am planning to set the daily charging limit to as less as 50%. Would this be bad OR good for the battery management?

-New M3 Mid range owner

jjgunn | January 25, 2019

If you're only driving 50 miles or less - charge to 60%-65% - drive the car down to 40%-45% & charge back up to 60%-65%

As a general rule of thumb, The closer you can keep the battery to 50% the longer the battery life should last - Got that from Jeff Dahn.

sameer1302 | January 25, 2019

Thank you jjgunn!! Thats very helpful

swanson21 | January 25, 2019

"I don't drive to work. (Yes we do exist, don't commute but still buy Teslas... Just to experience the future).
My average daily need is less than 50 miles."

umm, an avg daily need of 50 miles seems way over the avg daily commute of the population, don't see why you had to include that you "don't drive to work" if you're logging those kinda miles but some people just have to brag I guess

CST | January 25, 2019

I don't drive to work and MY daily need is less than 49 miles! Beat that!

SteveWin1 | January 26, 2019

I do drive to work and my daily usage is probably 20 miles a day. I still charge to 90% in case something comes up and I need extra range... You never know. Plus when I take friends and co-workers on drives, if they see my battery is low, it reinforces their worries about EVs and low range. AND, the cars get slower with lower SOC. I didn't get a performance just to let some punk in a noisy Corvette beat me off the line at a stop light. ;)

kevin_rf | January 26, 2019

My daily commute is 95 miles, plus errands and only charge to 75%. And yes I live in New England.

Hal Fisher | January 26, 2019

SteveW, I live in CA and had a 97 z28 supercharged for awhile. Nobody ever wants to race here it seems so i just went with the rwd unit. I almost pity the ones around here who paid for performance expecting to use it. Everything is stop light to stoplight. I go fast only for others to catch me at the light, might as well putt along like they do here (san diego and upper bay area). Just a warning that it might not be worth it to buy the performance in my area.

Hal Fisher | January 26, 2019

Also, even now I’m afraid I’ll catch someone off guard if I jump around. They may think they are quick only to pull out in front of me, then their car has to down shift and mine doesn’t so i have to avoid or hit them.

SteveWin1 | January 26, 2019

@Hal, yeah. You can always take it to the track on the weekends.

syclone | January 27, 2019

If you listen to some of the "experts" here, you end up with a car that that has an effective range of 30 miles (45 -55%). 90% of them will trade or sell the car in 3 - 4 years (or when the next bit 'thing' comes along).
Drive your car, enjoy it - the battery will outlast your ownership.