So apparently, always charging to 100% is OK (?)

[Valen]

The current gen of batteries is more or less based on the same tech which is lithium-ion.

The next gen "solid state batteries" is still on testing purpose.

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[satchurator]

It's really not a good idea to take a Sales Associate's technical suppositions as the definitive word and embrace it as overriding fact. Even if it's what you would prefer to believe. There's so much bad information quoted from SAs in this forum!

Do you want to give the service department or Porsche a future excuse to deny your warranty battery replacement because you didn't adhere to the charging guidelines?

I would like to think that Porsche's HV battery engineers took into account the full capacity vs. usable in determining the 80% mark as the owner-facing charge target for maintaining HV battery health.

I just bought an Audi Q4 e-tron for my wife (which incidentally has an 80% target charge baked-in as 'battery protection') and the SA in that experience spoke confidently and eloquently through a mish-mash of misunderstood truisms about charging. I gave up on correcting him. An average person, new to EVs would have heard his confidence and considered him 'knowledgeable'.

 

[diegomedinaf]

I was chatting with my SA today, finalizing plans for the delivery of my new GTS tomorrow, and he mentioned something I found very interesting yet remain slightly skeptical about. I was asking about recommended charging practices and even referenced a thread on these forums, specifically Squiden’s words of wisdom, to see what his thoughts on this topic was.

My SA is a very knowledgeable person in general, which is surprisingly uncommon with car sales personnel that I’ve encountered over the years, and his family has owned and operated this Porsche dealership for over 30 years. so he knows his Porsche stuff.

He basically said that charging to only 85% is not necessary because Porsche has already designed the Taycan to never charge to the full capacity of the battery even when it says 100%. All EVs leave this headroom to some degree, but he claims the Taycan does so even more than others. Apparently when it says 100% on the Taycan’s display, it’s really more like 90%. So if you charge to “100%” every time, you’re really only charging to around 90% which is within a stone’s throw from the magic 85% number. So if I charge my Taycan to 85% as often recommended by many here, I’m really only charging 85% of 90% which is more like around 75% (check my maths lol).

My SA said to just enjoy the car, don’t worry about charging so much and just charge to 100% when you can, and avoid fast-charging unless really necessary. He says regular home 240V AC charging with 40A or so to 100% is already optimal for battery health because Porsche in all their German wisdom have already sorted this out for all Taycan owners so that they have one less thing to worry about.

Makes a lot of sense to me. I think I’m sold.

If fast charging is not recommended, why would they give you access to Electrify America and they’re fast chargers where you can get 30 minutes every day to charge your battery?

I have a level 2 48A at home and I can regulate the amperage on it. Should I bring it down to 40 would that really make a difference?

I have a time to set to 85% by 5:30
Am which I have not used yet. I got the car fully charged and yesterday I was able to test the fast charger in 150Kw EA station.

im going to stay with the 85% cap unless need to do a long trip, I want to see data before going the extra 15%

 

[W1NGE]

Multi manufacturers and each car manufacturer will have their own software layered on top.

Regardless, the principal will be the same as we persist with li-ion.

Two years time things will change / improve.

 

[DerekS]

My first sales advisor told me something similar; "if you're not going to keep the car more than 3 years just charge to 100% every day."

I found that kinda selfish, and opted to charge to 85% anyway matching the manual's recommendation.

 

[daveo4EV]

I was with you up until No.4……….?

yeah it was late and I was being lazy.

 

[masmole]

If fast charging is not recommended, why would they give you access to Electrify America and they’re fast chargers where you can get 30 minutes every day to charge your battery?

Regular fast charging is not recommended for optimal battery health. Obviously, for some people who drive very long distances daily and rack the miles up, this is not possible as using the available DC fast-charging networks becomes necessary. A necessary evil. But for people who don't need to fast charge regularly, "slow" home AC charging is the better option.

I have a level 2 48A at home and I can regulate the amperage on it. Should I bring it down to 40 would that really make a difference?

No need. 48A is still just level 2 and considered "slow" AC charging, which is optimal for battery health. Even Taycans equipped with 19.2kW chargers with owners equipped at home to do such charging are still fine, since it's still technically "slow" compared to the DC fast chargers.

 

[daveo4EV]

93 is not a prime number.

93 = 3 x 31!

yep I was wrong - post updated - I'm sure the BMS will also penalize me.

 

[Dee]

100% on the display doesn't mean 100% battery capacity.
The car only uses 90% of that 100% cuz there's a 10% spare.
At the bottom, not the top.
So if you are charging to 100% the battery is full, 110%.
So when you're down to 0%, there's still 10% left.

Now what I've read about the Macan EV Porsche is going to use more of that 10% cuz on the Taycan it was just to be conservative on new tech but now that there's more data, it's possible to use more of the total capacity without the risk of draining the battery to near 0%...

Other thing:
Charging to 100% is just what the BMS is saying but in reality all cells are charged to the level of the worst cell*.
That means when you charge to 100% when the car is new, there is more range than when the car is 10 years old but it still says 100%.
So there's a difference in what the display says and what the actual capacity is.

*Overcharging can cause heating, fire or even explosion of the cell so all cells are balanced to that individual cell.
In the beginning the differences are very small but along the way they get bigger.
That's also the reason that, when you change one or more "bad cells", the entire battery pack can go back to it's original full capacity.

Just my 0,02.

 

[tbinmd]

Why not go by what Porsche says in the owners manual? The revised manual (from the uPdate) for our MY22, says for daily use charge to 80% for none long journeys.

 

[W1NGE]

Regular fast charging is not recommended for optimal battery health. Obviously, for some people who drive very long distances daily and rack the miles up, this is not possible as using the available DC fast-charging networks becomes necessary. A necessary evil. But for people who don't need to fast charge regularly, "slow" home AC charging is the better option.




No need. 48A is still just level 2 and considered "slow" AC charging, which is optimal for battery health. Even Taycans equipped with 19.2kW chargers with owners equipped at home to do such charging are still fine, since it's still technically "slow" compared to the DC fast chargers.

There is a setting in the PCM to throttle ultra rapid charging for regular users.

 

[Jhenson29]

93 = 3 x 31!

24668515962533768453176688640000000 = 3 x 31!

 

[Sidicks]

24668515962533768453176688640000000 = 3 x 31!

I see what you did there!

 

[NJ-Taycan]

Perhaps there is some validity to what the OP’s statement from their SA. If the battery is 93.4kWh but only 83-87kWh’s are usable, then wouldn’t charging to 100% always leave some built-in reserve?

 

[daveo4EV]

Perhaps there is some validity to what the OP’s statement from their SA. If the battery is 93.4kWh but only 83-87kWh’s are usable, then wouldn’t charging to 100% always leave some built-in reserve?

yes - but unless we know "where" the buffer's are in the 93.4 kWh - most are at the bottom and less is at the "top" of the battery range...so we don't know how stressful 100% actually is on the battery - because Porsche has not disclosed the "hold back" amounts and what the split is between the bottom and top range buffers…

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