🔋 Baseline for HV Battery SoH Performance (Battery Degradation Data by Taycan Owners)

[Hans21]

Are you all shure that a deep cycle or DC charging has any influence on the reported SOH number using the OBD method?

On my own 2023 Taycan Base RWD with battery plus I didn't charge beyond the 80 % target set on the car for a month or ~ 5.000 km. It resulted in the exact same SOH read out every single time I checked. See that flat line around the 94,23 % SOH number.

That is mainly AC charging at home, maybe 3 or 4 DC charges on the road. Even if I try this out right now I can always get the same number as long as I don't charge up to 100%.

At the end I did charge a few times to 100 % so I got different read-outs again. At first lower than the 94,23 but then once I started balancing more it reported higher numbers again. Currently it sits at 94,74 %.

I'll see if I can deep cycle it later this week to verify. I was looking into this data only recently because of the battery recall letter I got asking me to limit charging to 80 %. I was worried it wouldn't balance if doing so, and indeed it doesn't balance the battery when a target is set.

So if you're sticking to such a target make sure to charge to full from time to time.

Blue line on bottom graph is the imbalance readout every time it reached that 80 % target over that 1 month or 5.000 km. It only increased over time. Untill I started charging to 100 % again.

The red line can be ignored as it's all over the place because of the different SOC values and other variations in conditions.

Edit: the highest SOH I've seen so far was at 12.000 km when it reported 94,87 % at 100 % SOC. I'll try to balance it a few time at lower kW to see if I can beat that again.
There might be some truth about that deep cycle as I see that latest higher number was after charging slowly (1.9 kW lower limit of included Porsche wall charger) after it dropping just a few percentages when parked. So not deep cycling at all.

 

[SergeyIndy]

16k miles. Happy that SoH holding steady.

 

[tchavei]

Are you all shure that a deep cycle or DC charging has any influence on the reported SOH number using the OBD method?

Yes. My SoH changes whenever I do 2 things: charge to 100% and/or blast the battery with 270kW charging rate. Must be the equivalent of a face slap "Wake up you useless lithium piece of sh**" ?

I usually recover around 0.5%. I would probably get more back if I did the full procedure like recommended (deep discharge, rest, full charge, drive)

 

[Hans21]

Okay so I can confirm on mine it will only change the SOH reading when charged to 100% AND ODO changed. Just dropping voltage stationary and charging back up has no effect on SOH. And skipping the 100% also still freezes SOH readings.

Deep cycling or not doesn't seem to have any influence (or at least it also changes if not deep cycled). For DC charging I'll do some more readings when I get to DC charge. Don't use that much.

 

[tchavei]

Another update (I think I'm driving too much ?)

Km: 46000
SoH: 89.41%

Charged twice to 100% this period which explains the recovery in SoH

 

[Tay Chi]

Thank you all for the wealth of information provided here. Here is mine

1. Unknown
2. 7800 miles (12500km)
3. SoH 88.77
4. DC charging. 80kw
5. MY2023

After rebalancing, SoH went to 90.68
Is this reasonable for this mileage? How often can rebalancing be done? Is there a limit to its benefit?

 

[tchavei]

Thank you all for the wealth of information provided here. Here is mine

1. Unknown
2. 7800 miles (12500km)
3. SoH 88.77
4. DC charging. 80kw
5. MY2023

After rebalancing, SoH went to 90.68
Is this reasonable for this mileage? How often can rebalancing be done? Is there a limit to its benefit?

In theory we should avoid charging to 100% except during road trips (when you will immediately travel after charging up) as battery chemistry apparently degrades when leaving the battery topped up to 100% over long periods. There's a reason manufacturers usually deliver battery powered products at 50% charge... That's the level a battery suffers least amount of degradation.

Almost 91% doesn't seem bad for your mileage. The first 1k km is where you lose most health then it slowly stabilises. It also depends on climate. Warm/hot climates wear out the battery faster than cold climates.

Cheers
Tony

 

[SergeyIndy]

Thank you all for the wealth of information provided here. Here is mine

1. Unknown
2. 7800 miles (12500km)
3. SoH 88.77
4. DC charging. 80kw
5. MY2023

After rebalancing, SoH went to 90.68
Is this reasonable for this mileage? How often can rebalancing be done? Is there a limit to its benefit?

That is in line with the data that we have for your mileage. There is no guidance on how often to rebalance, but I plan to do it every 5k miles with intent to monitor any cells going bad, because this is when they come forward. However, I capture cell SoC, Voltage, and Temp every time I take SoH measurements which is every 1k miles.

 

[ckyr]

1) unknown
2) 89.66%
3) 13177 miles
4) Roughly 850kWh
5) 2023 GTS

 

[hus2k7]

1) unknown
2) 85.1%
3) 30k miles
4) only charge at home
5) 2020 turbo s

is this bad or reasonable degradation?

 

[Bognar67]

1) unknown
2) 85.1%
3) 30k miles
4) only charge at home
5) 2020 turbo s

is this bad or reasonable degradation?

Seems relatively bad.

 

[hus2k7]

Seems relatively bad.

I havent done this battery recharge thing, this is just me checking. I will have a go wih the reset and requote numbers

 

[Bognar67]

I havent done this battery recharge thing, this is just me checking. I will have a go wih the reset and requote numbers

As a reference my MY2022 car (without balancing procedure):

 

[hus2k7]

So according to chatgpt (i know), I never charge to 100%, I can't remember the last time I did, so its telling me to rebalance my battery. but its saying to let the car rest at 100% for a few hours, this seems contradictory?

Tip	Why it helps
? Occasionally charge to 100%	Enables the system to detect and equalize cell voltages properly.
? Let the car rest at 100% for a few hours (e.g., overnight while plugged in)	Balancing usually happens during idle time, not during charging itself.
? Don’t always stick to 80–85%	Staying too long at mid-range SoC can prevent balancing from ever being triggered.
? Check cell voltages (via OBDeleven or other tools)	Useful if you’re tracking battery health or think you might have an imbalance

 

[Bognar67]

So according to chatgpt (i know), I never charge to 100%, I can't remember the last time I did, so its telling me to rebalance my battery. but its saying to let the car rest at 100% for a few hours, this seems contradictory?

Tip	Why it helps
? Occasionally charge to 100%	Enables the system to detect and equalize cell voltages properly.
? Let the car rest at 100% for a few hours (e.g., overnight while plugged in)	Balancing usually happens during idle time, not during charging itself.
? Don’t always stick to 80–85%	Staying too long at mid-range SoC can prevent balancing from ever being triggered.
? Check cell voltages (via OBDeleven or other tools)	Useful if you’re tracking battery health or think you might have an imbalance

Yes it is. 100% is bad to the battery, but balancing needs this. Do not do it so often and will be all right.