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The problem is that it loses track *immediately* after anything but a 100% charge. I do tons of 100% charges, often I do them 4x in a single day while towing in order to get reliable estimates. E.g.: 1. Charge to 100%, drain to 0%. Trip meter reads ~133 - 135kWh consumed (see the infographic...

I have done this a few times, though not 100% to your spec. I frequently charge to true 100% on both L2 and L3, often 4 - 5x/week. I occasionally let it sit at 100% and go to sleep after charging, so that it can get an unloaded voltage reading. And I've drained from 100% to ~5% and let it sleep...

Hmm. Rivian Service confirmed that it was abnormal behavior and a bug, and that it affected a brand new Max Pack that they took to the RAN alongside mine. They claimed it affected "all Max Packs" (they did not specify generation.) They said senior engineering leadership was aware, and promised a...

I'm hoping this fixes the Max Pack charge curve bug that I uncovered. But I think that may have been too recent to make it into this update. Context: https://www.rivianforums.com/forum/threads/strange-calibration-issue-on-gen2-max-pack-service-has-not-seen-this-before.55431/

If you're trying to see if you're affected by this bug, you can't tell by comparing SoC and rated range in miles. What you need to do is fast charge from < 10% to 100%. Keep an eye on when it flips to "99%", and check how many kWh have been added. And then check again at 100%. Also watch how...

The problem also doesn't occur in the same way on L2, I should've been more clear about that. It adds about 5kWh for me from 99% to 100%, on an L2. Vs 20kWh on an L3. It also appears to be normal for Max Packs to add ~3 - 4kWh extra in that top 1%...there seems to be a bit of extra capacity...

Yeah, that appears to be a separate effect. Mine similarly drops in the cold as well, though I haven't had the battery below about 20F and haven't seen nearly as big a drop as yours. Your drop seems pretty high for cold-locking, but maybe that's normal at that temperature. If I ever get my...

A senior service manager called me back with an update. They charged a brand new gen2 Max Pack at the RAN as well. It has the SAME issue! Nobody was expecting that. They have determined that this is a firmware issue and may be affecting all (gen2?) Max Packs. Senior engineering leadership has...

As a temporary workaround, I used Claude to build an iOS app that monitors my Rivian SoC via API, and calculates the correct value in real time. The behavior is different charging vs discharging (it doesn't just hang out at 99%, it drains normally), and depends on how low I drain before...

My gen2 R1S Dual Max Performance adds only about 115kWh to get from zero to an indicated "99%", where it shows "370 miles" (gen2 Max Pack is specced for 140kWh.) If I drive from there, my nav estimates are usually WAY off. I've had a 23% estimate turn into 2%, even slowing down and drafting a...