Hacker News Board Hacker News, browsed like a classic message board
Live data from Hacker News

Tesla Model S battery degradation data

steinbuch.wordpress.com

Post reply on HN
Print view View original

161–170 of 257 posts

Re: Tesla Model S battery degradation data

#161

Post by heydonovan »

spullara wrote: post #109
GuB-42 wrote: post #102

That's quite impressive. What I am wondering is why they do do well, barely losing 10% in 5 years, compared to phone or laptop batteries that last maybe 3 years on average. AFAIK, they use the same technology, in fact, I wouldn't be surprised if the same batch of cells end up partly in Teslas and partly in laptops.

I believe this is due to the fact that by default Tesla recommends that you don't fully charge or discharge the battery if you don't need the range. For phones people charge them all the way everyday (or more) and often discharge them all the way.

How can we prevent a battery from fulling charging? We plug a car/phone in at night, and wake up to it 100% charged.

Re: Tesla Model S battery degradation data

#162

Post by photojosh »

Coincoin wrote: post #157
photojosh wrote: post #140

Earlier quoted context omitted.

2 000 km = 2 Mm? You're not thinking of the mebi-, kibi-, etc debacle, are you?

Yes. I'm old school, 1K is 1024, 1M is 1024K, 64K is 65536 and I refuse to use kimblebits and such. Ah... screw it: https://www.xkcd.com/394/

I'm with you, but it's a non-issue when it comes to non-computer units, which is what we're discussing here.

Re: Tesla Model S battery degradation data

#163

Post by photojosh »

bigiain wrote: post #146
photojosh wrote: post #125

Earlier quoted context omitted.

I'm curious at to when that example would ever be suitable; memory sizes should be grouped in 3s as well. The only one I can think of is phone numbers, e.g. Australia is a 4-3-3 grouping for mobiles. But a space has been the standard delimiter there anyway.

Dashes were "the standard delimiter" for a long time for Australian phone numbers. 451-4153 was my phone number growing up (and yeah, I'm showing my age with a seven digit phone number... A friend of mine was on 99-0066 up until the early or mid '90...)

Fair enough. I grew up overseas, so my local knowledge only kicks in in '99.

Re: Tesla Model S battery degradation data

#164

Post by photojosh »

microcolonel wrote: post #149
photojosh wrote: post #126

Earlier quoted context omitted.

> Why even talk about thousands of kilometres when you can speak in tens of megametres? Probably because when you're speaking about them colloquially, you don't say "kilometres" you say "kays". That probably varies by locale too, I'm in en_AU. How is it over your way? I do like the nerdiness in the idea of saying "two megs" instead of "two thousand kays", but it's never going to happen.

> I'm in en_AU. How is it over your way? It's mixed here in en_CA (I've lived in Calgary, Vancouver, and Toronto at different points). In my experience, kay is used for kilometres when talking about manual travel/exercise (bicycle, running) as in "couch to 5k", but it's almost always klicks or kilometres when talking about driving, and usually only kilometres when talking about most other forms of transport.

We occasionally use 'klicks' interchangeably with 'kay' or 'kays', but it's pretty rare.

Re: Tesla Model S battery degradation data

#165

Post by aphextron »

GuB-42 wrote: post #102

That's quite impressive. What I am wondering is why they do do well, barely losing 10% in 5 years, compared to phone or laptop batteries that last maybe 3 years on average. AFAIK, they use the same technology, in fact, I wouldn't be surprised if the same batch of cells end up partly in Teslas and partly in laptops.

The real killer for laptop batteries is the fact that they are kept at 100% charge plugged in while under extreme thermal stress. Temperature + full charge kills li-ion batteries. Do your laptop a favor and never charge to 100% unless you really need to.

Re: Tesla Model S battery degradation data

#166

Post by monitron »

heydonovan wrote: post #161
spullara wrote: post #109

Earlier quoted context omitted.

I believe this is due to the fact that by default Tesla recommends that you don't fully charge or discharge the battery if you don't need the range. For phones people charge them all the way everyday (or more) and often discharge them all the way.

How can we prevent a battery from fulling charging? We plug a car/phone in at night, and wake up to it 100% charged.

Tesla's cars have a charge limit you can set, after which the car simply stops. I believe they come by default at 90%. You're supposed to override it if you want to go on a long road trip.

Would be cool if there was a similar feature available on phones. Maybe you could rig up something with Tasker or the like on an Android.

Re: Tesla Model S battery degradation data

#167

Post by kurusii »

stephengillie wrote: post #113
wongarsu wrote: post #101

Earlier quoted context omitted.

>but there's not really any standardization of this as far as I know There is. Resolution 10 of the 22nd General Conference on Weight and Measures [1] (the body responsible for the SI system) forbids the use of comma ordot as thousands separator. Other institutions like NIST have followed suit, forbidding or at least recommending against it. The recommended approach is to use spaces as thousand separators (or ideally…

[Comments cannot be deleted once a reply has been made.]

As a side note (not to you particularly--I see this a lot), you can't delete a comment once a reply is made in order to preserve context to the replies. This is probably for people like me, who come after the replies are written.

With this in mind, why side-step the inability to delete your comment by just replacing it with something else? It's technically allowed, but isn't that against the spirit of the original rule?

Re: Tesla Model S battery degradation data

#168

Post by stephengillie »

kurusii wrote: post #167
stephengillie wrote: post #113

Earlier quoted context omitted.

[Comments cannot be deleted once a reply has been made.]

As a side note (not to you particularly--I see this a lot), you can't delete a comment once a reply is made in order to preserve context to the replies. This is probably for people like me, who come after the replies are written. With this in mind, why side-step the inability to delete your comment by just replacing it with something else? It's technically allowed, but isn't that against the spirit of the original ru…

The comment was losing points and thus obviously incorrect. I'm not going to let it sit around and burn internet points!

Re: Tesla Model S battery degradation data

#169

Post by kalleboo »

photojosh wrote: post #124
digikata wrote: post #119

Earlier quoted context omitted.

A lot of these could be mitigated if phone makers were willing to put in a slightly larger capacity battery and apply more conservative max-min limits in their battery management system. But I guess companies are happy to keep sales up via planned obsolescence.

My phone rarely gets below 50%, and I'd say it only gets below 20% a handful of days a year. But yes, I've often thought it would be nice to have a toggle to say "Prolong battery life (as in years)... I only want a 90% charge since I'm not going to be using much tomorrow." I've wondered too whether I should only use a slow (1A) charger for the overnight charge rather than the full 2.4A. But then again, I only keep my…

It looks like Sony's Android phones have this option https://www.phonearena.com/news/Sony-Xperia-Marshmallow-upda...

Re: Tesla Model S battery degradation data

#170

Post by kalleboo »

monitron wrote: post #166
heydonovan wrote: post #161

Earlier quoted context omitted.

How can we prevent a battery from fulling charging? We plug a car/phone in at night, and wake up to it 100% charged.

Tesla's cars have a charge limit you can set, after which the car simply stops. I believe they come by default at 90%. You're supposed to override it if you want to go on a long road trip. Would be cool if there was a similar feature available on phones. Maybe you could rig up something with Tasker or the like on an Android.

It looks like Sony's Android phones have this option https://www.phonearena.com/news/Sony-Xperia-Marshmallow-upda...
Post reply on HN