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From time to time, I charge my GT to 90% (level 2). I am wondering about how real the negative effects are on the car's batteries. I only plan to keep the car for 3 or 4 years, so this isn't a huge concern for me.

The reason I charge to 90% is because I am driving more lately, and my current charging setup is a little cumbersome to use. I would like to charge to 90% all the time, but have some reservations.

I have read a bunch of articles on best charging practices, and the consensus is that charging to 90% speeds battery degradation, but I can't find good data on how much this hurts the batteries.

Thoughts?
 

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2019 e-Tron 55 Premium Plus with Full Driving Assistance
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Audi went super conservative regarding charging, and they limit user's access to the top and bottom portions of the battery. So when you charge to 100%, it's not really that, it's more like 96% or so. And the same with bottom portion, I don't remember exact numbers, hopefully other people here will post them. This was done specifically to prolong battery life and prevent damage from charging.
I charge to 100% twice a week because I drive a lot to work and don't have a home charger. Honestly, I don't care much, I trust in Audi's battery tech, and hopefully I'm right :)
 

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From time to time, I charge my GT to 90% (level 2). I am wondering about how real the negative effects are on the car's batteries. I only plan to keep the car for 3 or 4 years, so this isn't a huge concern for me.

The reason I charge to 90% is because I am driving more lately, and my current charging setup is a little cumbersome to use. I would like to charge to 90% all the time, but have some reservations.

I have read a bunch of articles on best charging practices, and the consensus is that charging to 90% speeds battery degradation, but I can't find good data on how much this hurts the batteries.

Thoughts?
I wouldn't be concerned about 90% while using L2 charging. Using L3 charging even to 80% would be much worse. The etron maintains buffers at both ends of the battery to minimize charge/drain degradation. The etron will not let you "fill up" the top 2% of the intrinsic battery capacity (ie, when you charge to "100%" , you are charging only to 98% of the intrinsic capacity). Also, the etron will not let you drain the last 8% of charge from the battery .
 
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