OK to full charge to 100% regularly?

Kingske

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Well this has been covered extensively before. Different chemistries and configurations push the cells differently. Some cars, like the I Pace, say charge to 100% always. The Taycan SPECIFICALLY says DO NOT charge to 100% unless you need to, use 85% max. So they believe if you do it when you don’t need it it will impact longevity.

When in doubt go with what is recommended by the manufacturer. Look in your manual.
I also wonder whether a pattern of consistent charging to 100% of the usable capacity may jeopardize your warranty rights on the battery, given Porsche's consistent written directives to only charge to 85% unless the car will be used for a long trip the next day. Would Porsche not be able to download a log of the car's charging sessions one way or the other?
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daveo4EV

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I seriously doubt porsche can compromise the warranty because you charge to 100% all the time - Porsche's battery management software (BMS) controls the battery - it's all on them to make sure they don't damage the battery.
 

DennisB

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probably because that is what their internal testing said is the best for the battery.
Correct, but that's Porsche's interpration and offcourse they tested it, but if you look at the test review that stated that a 80% charge when using the full capacity battery shows almost no degredation with 10.000 cycles.

If the degredation is minimal why unneccasary extend the lifespan of a battery/vehicle that would never make those miles.

Porsche Taycan OK to full charge to 100% regularly? 1606393559087


The main discussion here is the range you get out of your Porsche. It already was a big topic when the Taycan was introduced and the first results came out.

If you add everythin up it looks like you could get a lot more miles out of your battery, but Porsche doesn't provide this. I'm just trying to understand why. Maybe they first need to have the pratical data of reallife usage of the car, or it's a safety measure for the battery.
 

Scandinavian

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Correct, but that's Porsche's interpration and offcourse they tested it, but if you look at the test review that stated that a 80% charge when using the full capacity battery shows almost no degredation with 10.000 cycles.

If the degredation is minimal why unneccasary extend the lifespan of a battery/vehicle that would never make those miles.

1606393559087.png


The main discussion here is the range you get out of your Porsche. It already was a big topic when the Taycan was introduced and the first results came out.

If you add everythin up it looks like you could get a lot more miles out of your battery, but Porsche doesn't provide this. I'm just trying to understand why. Maybe they first need to have the pratical data of reallife usage of the car, or it's a safety measure for the battery.
Please remeber that the graphs shown here are from Jeff Dahn, and reflect the new Tesla Batteries, not the present generation batteries in Taycan.
 


feye

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Scandinavian

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I am not sure you have seen this video. It is produced by a guy working with battery design. His introduction was

“ I did a PhD in Electrochemical Engineering, and currently work on battery design so battery topics are my specialist topic.”

It is a longish video with a lot of good information but quite technical. But the summary at the last two or three minutes is the best advice I have seen in a nutshell. Enjoy!

 

Englishtony2002

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The facts about Li-Ion chemistry are well known, and have already been covered in this thread. More frequent fast charging and more time spent charging to and holding charge above 90% degrade the battery chemistry. I don't think that's the discussion point here though. If you don't plan to keep the car a long time (more appropriately don't plan to put a large number of miles/KMs on the car) AND you don't care about the value to whomever gets the car after you, then charge however you want - it's not likely to matter to you. Porsche may be able to turn on diagnostics about how a battery was treated over its life to support the used Taycan market but unless such efforts could be demonstrated to enhance brand loyalty or new car sales, I don't see them actually doing this. Tesla did not do this.

I put almost 100K miles on a 2012 Tesla Model S P85. Rarely charged to 100% (but did not hesitate to do so if I thought I might need it - probably ten times a year), 80% the rest of the time. 100% range when new - 265 miles. Range when sold - 245 miles. So taking care of the battery is helpful, based on a sample size of 1.
I put 80 miles on a Tesla S 90D in just over 5 years, 100% range dropped by 10%. More than 50 % of all charging was Supercharging too, and often to 100% at home as I do a lot of long trips.
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