Alan

[Alan @alanlcit]

@dbierce @dylaneworden @brandenflasch Yep that's a Panasonic NCA, thanks for confirming. (If it's LG then it's NMC.) Cold helps for sure. Hot, not so much.

[Alan @alanlcit]

@dbierce @dylaneworden @brandenflasch This is NCA I think? The LG NMC do considerably better than the Pana (though they suck at charging).

[Alan @alanlcit]

@brandenflasch @eivissacopter Putting aside management of initial degradation and whether a buffer is allocated, the bigger problem is that Tesla capacity loss (in the US Pana packs) is way way worse than most manufacturers (even including others' hidden buffer loss). Somehow 20% in 4 years is now "fine?"

[Alan @alanlcit]

@brandenflasch Specifically, they do. 2024 Model Y LR AWD uses 251.3Wh/mi constant, so shows loss of range below 77.9kWh. And that is approximately denominator used for health test. But pack starts at 80-82kWh. So 6% is about 9-10%.

[Alan @alanlcit]

@brandenflasch That's why I said they pick something lower than the start point for the denominator - makes it look better than it is. (By as much as 3-5% in some cases.)

[Alan @alanlcit]

@brandenflasch Exactly. And they do. That's why they should provide the denominator. But they don't.

[Alan @alanlcit]

@greggertruck @brandenflasch @MilMileBattery This is not new information; the washer fluid system compressor noises have been heard for months.

[Alan @alanlcit]

@grok @gregm12 @neverdemocrat0 @AustyUSA Yup. Absolutely f’ing clueless useless clanker.

[Alan @alanlcit]

@gregm12 @grok @neverdemocrat0 @AustyUSA Definitely @Grok is about as dumb as a rock. Or a box of rocks. Probably it is going to make some inane comment in response to this.

[Alan @alanlcit]

@grok @neverdemocrat0 @AustyUSA Well since you were wrong about 400V/800V being the reason for the difference, I don't really care.

[Alan @alanlcit]

@grok @neverdemocrat0 @AustyUSA This is absolutely false. The voltage of the system only is an issue if current somewhere in the system is a limiting factor. Most of the Tesla charge curve is limited by the C-rate of the pack. Max current from v3 Supercharger is around 700A so minimal impact.

[Alan @alanlcit]

@adambecker1 @AustyUSA @toidinamaisey Yep, considerably slower than the OG pack even when new (250kW around 25%, and 140-150kW at 50%).

[Alan @alanlcit]

@adambecker1 @AustyUSA @toidinamaisey Yeah, it can be significant. Only 35k on my 2019 but nerfing comes for us all. In any case your pack always charged more slowly than my original pack. You’ll probably start taper in the low 10s now. Just arrive at 5% - have to optimize more and more as taper collapses.

[Alan @alanlcit]

@AustyUSA @adambecker1 @toidinamaisey The nerfing is so bad. Curious if other manufacturers will have to do this. We’ll know in a few years.

[Alan @alanlcit]

@adambecker1 @AustyUSA @toidinamaisey February 27th 2026. If you have Supercharged more or you have more miles (not sure which), Tesla seems to nerf you more. But this is definitely nerfed - tapers at ~21% used to be ~25%.

[Alan @alanlcit]

@AustyUSA @toidinamaisey It’s actually degraded a bit from original, just not as much as some with more miles/supercharging. Taper currently begins around 21-22% (instead of around 25% which these packs (if low use) did until 2023ish (software update nerfed it)).

[Alan @alanlcit]

@toidinamaisey Same reasoning applies at 17%. Voltage at 17% (which is 4.5+0.955*17=20.7% "energy" SOC due to 4.5% buffer) is obviously lower than the weighted average pack voltage. So coulombic SOC is considerably higher than 21%.

[Alan @alanlcit]

@toidinamaisey No, that's the coulombic SOC. You probably have a 4.5% buffer still but that means that coulombic will be higher (since voltage of those electrons is lower they have to be more numerous to get 4.5% energy).

[Alan @alanlcit]

@AustyUSA @toidinamaisey Not sure about your OG 2170 data - I think it was better than that. I know it's the average but makes sense to compare best case. My OG pack is degraded 19% but adds 11%-80% (~42kWh) in ~22 minutes. Is that 39 minutes a typo? 1%-60% seems right (my 11%-60% is about 13 min).