Recent content by AAKEE

No, it is not like that. The 4.5% buffer is the part of the battery below 0% on the screen. But these 4.5% can be used to drive on. The shut down level is most certainly below most of these 4.5%, and the shut down limit is 2.5V/cell, which would mean 240V on a 3/Y pack. We can see the BMS...

Lead acid batteries is very sensitive. They start to degrade when discharged to 50%, just like the LV 12V lead acid batteries used earlier in teslas. They sulfate from low SOC, and should not be discharged below 50%, and preferably they are held at 100% all the time. Its a completely other...

As long as the cells did not go way to low in voltage, the battery would have the least degradation in this state. 0% true SOC (a.k.a - 4.5% displayed SOC) causes the least calendar aging. There is very much research on this and 99.9% of all research agrees to this: The lowest calendar aging...

The contactors disconnect every time the car sleeps. And connects when it wakes up. Its easy to hear the clonks when the car wakes up or falls asleep. The same connectors will open when the BMS sees that the battery reaches the lower voltage limit. This is done to protect the battery from...

Tesla has only one charging advise. This charging advise is the same regardless of the chemistry tou have in the cells. Its also the same if you live in a very hot or very cold climate. Tesla do not at all aim for the lowest degradation. Tesla tries to male sure you do not run out of juice at...

It would be interresting to hear about this car, about the battery and range etc. Could you report back when you know?

Cyclic aging is very very small during normal operation. We can reduce the cyclic aging by using smaller cycles and do these at lower SOC. 10% DoD series. Lowest degradation is 35-55% SOC in this test. On a Tesla display this is around 32-53% displayed SOC due to the buffer. Even using the...

Except from short range, no, I work far away from home and aim to arrive with low SOC. I still have a little to be able to cirmumnavigate any accident etc, as I go live into readinnes when I arrive at work (not good to be late). So I aim to arrive with ~ 10-20% and I have the car parked not...

I often use that picture to show both how similar the three chemistries behave and show a good average for Calendar aging for NCA. That picture is very good for these two things, but it is not the conclusion in all aspects. The very high droop is not present in all NMC test, in many cases it is...

Most answers already given. For longevity you would like to have the battery below 60% as much of the time as possible. The cells do not need to be stretched. Ever, really. Low SOC and small cycles reduce the degradation. The technique to ”stretch” is to help the BMS to estimate the battery...

[Sense] is subjective in this case. If longevity and to reduce degradation is the goal, low SOC is preferable both for calendar- and cyclic aging. You can not reduce degradation by charging past 55-60%. As long as the energy from 55-60% or less is enough for daily driving (chemistry...

Nope, its not. This is how calendar aging is affected by SOC and temperature. For NCA cells (Panasonic) stay at 55% displayed SOC or lower. For NMC/NMC(A) (LG) stay at 60% displayed or lower. 50% is on the good side and causes about 50% of the calendar aging above 60%. The calendar aging...

The LG M50 cells are not high power cells. A lot of tests shows that they are not, neither for charging nor discharging. We can also see in tests that high charging power clearly causes a extra wear from quite low charging power so from that we can assume that Tesla need to limit the charging...

Well, yes. I guess he means keep it connected? Low SOC cutvthe calendar aging in half, which makes extra sense hot days. When deiving, these apply: (My MSP but from memory it was the same values for my 2021 M3P) Target for passive cooling of the batt is 40C. (Most certainly means using...

If it was for the past 6 years, it is not NMC. Before 2021 all batteries was NCA. (The Not worry part is correct :) )