Dealer advised charging to 100% always

[BLH]

Picked up my new Macan EV rwd
During the handover the dealer recommended always to change to 100% on your home charger. AC. I said this contradicts what I've read about the 80% across manufacturer rule. He said that is old thought methods and porsche now recommend charging to 100%. Only charge to 80% when leaving the car in an unused state for a period of time (unclear on what that time frame was)
When I asked why, he replied the science now was that the 20% left unused cells were consistently not being used/charged regularly therefore the cells would likely deteriorate more overtime.

anyone else has this advice?

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[SergeyIndy]

Complete and total nonsense, so let's agree not to listen to clueless dealers, that is the advice.. If they say, corporate told them, then let's see some proof. I have access to internal docs and the chemistry while improved did not change the fundamentals of battery care from Taycan. I can share tons of data and studies.

In short if you want to follow best practices then charging to 80% for daily use still stands as a general recommendation, charging to 100% only when you plan to use it asap, and keeping the car at 50% when at rest for long periods, and do not keep car at 25% or less for long periods. However, there is a camp that would say that there is nothing you can do to harm the battery so you can do whatever you want and BMS will handle it. I choose to follow best practices.

Quick look at the manual for 2026 that dealers do not read, so please print, and put that in front of their faces:

 

[BLH]

Complete and total nonsense, so let's agree not to listen to clueless dealers, that is the advice.. If they say, corporate told them, then let's see some proof. I have access to internal docs and the chemistry while improved did not change the fundamentals of battery care from Taycan. I can share tons of data and studies.

In short if you want to follow best practices then charging to 80% for daily use still stands as a general recommendation, charging to 100% only when you plan to use it asap, and keeping the car at 50% when at rest for long periods, and do not keep car at 25% or less for long periods. However, there is a camp that would say that there is nothing you can do to harm the battery so you can do whatever you want and BMS will handle it. I choose to follow best practices.

Quick look at the manual for 2026 that dealers do not read, so please print, and put that in front of their faces:

Figured that was the case. First EV. Dealer nonsense.

 

[Somehow]

In general this depends on the battery's chemistry / architecture. There are some battery types which should better be charged to 100%, but to my knowledge that's not the case with the Macan. But I don't really know much about the Macan's battery.

 

[SergeyIndy]

In general this depends on the battery's chemistry / architecture. There are some battery types which should better be charged to 100%, but to my knowledge that's not the case with the Macan. But I don't really know much about the Macan's battery.

And you would be correct, 100% recommendation applies to LFP (Lithium Iron Phosphate) EV batteries. Macan EV battery is a common NMC type that is not recommended to be charged to 100%, specifically NMC 811–class chemistry (high‑nickel NMC) the same family used in the Taycan and Audi PPE‑platform EVs.

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