iron tofu

Hi,

I'm not sure if this is just in my country, but I've heard that the Q8 e-tron cannot be charged to 100% using rapid charging; it is limited to 80%. I was quite surprised to learn this after purchasing the vehicle.
Is there a similar restriction in your region? In my use case, I only have access to rapid chargers, as standard charging facilities are not available.

Additionally, I'm looking to bypass this 80% limit. Does anyone know of a good method to do so, perhaps by changing the OBD codes or something similar? Any advice would be greatly appreciated.

Ryanthegreat1

I don't know of such a limit.

They do slow down substantially after 80%. That's a limitation of the battery chemistry.

iron tofu

Hmm, This limitation was officially confirmed by Audi Japan's support. It was also mentioned in very small print in the brochure.

dcpmark

I'm not sure it's actually related to battery chemistry....I think it's artificially slowed down in the software to increase battery longevity.

iron tofu

GT can be rapidly charged up to 100%, but the Q8 e-tron stops at 80% and cannot be rapidly charged beyond that.

A4 Phil

I have charged my '19 e-tron to 100% using DCFC many times. It really does not even get that slow compared to other EV's. But on road trips I have done this. You would not try crossing SD without starting at 100%!

JohnnyJ

Yes, the more charged a battery is, the slower is the remaining charge.
Example:

Ryanthegreat1

Q8 has a very different battery chemistry with a much slower 80-100% charging rate.

The 19-23 fat etron is a DCFC freak.

A4 Phil

Here is the '19 e-tron charging curve. Not sure what the random one above is.
https://evkx.net/images/models/audi/...rgingcurve.svg

JNealCox

Pretty much ALL EV's dramatically slow charging from 80 to 100%. Typically, it takes about the same amount of time to go from 80 to 100% as it does to go from 10 to 80%. Nothing new here. This is simple physics. As the batteries fill up with electrons, the electrons start getting in each others way. This starts to generate heat that can damage the battery, so the charging rate is dramatically reduced to minimize the heating.