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Hopefully is efficient!!!
Finally
Am I reading the results correctly in that the cell retains 3880mAh of the original 4850mAh after 1000 cycles? Doesn't that kinda suck?
The answer would be it depends on what you think sucks. It does mean that after 300,000 miles you should still have 80% capacity. You will probably have more because you didn't fully drain and then recharge the battery to 100% every time.
That's nearly 300,000 miles worth (1,000 cycles x 130kwh battery x 2.25 mi/kwh). At that point you'd still have a 240 mile range battery. I'd say that's pretty good.
If 1 cycle is "314 miles", that's 314,000 miles with an 80% retention rate. Isn't that kinda good? What's a Tesla look like at 300k miles? Or 100k miles?
A cycle is indifferent to how you charge, it just means a full 100%, so the 300k miles is accurate, regardless of if you do it all in full charges or lots of small ones.
Is it at least a 21700 cell and not an 18650 cell?Well, that absolutely confirms that the door flashlight doesn’t contain the “7777th identical cell” - as my flashlight contains a 3.2V, 2Ah cell:
That is not what I understand. If say you charged and discharged the battery from 55% to 50% until you have reached the equivalent of 1000 cycles the battery should be much less degraded than if you did full discharges and recharges. I gleaned this from an interview with Bob Gaylen, but I don't remember which show.
There may be differences in degradation between strategies, but a cycle is 100% of the capacity, however you arrive to it. I'm not sure whether that test specified how they were discharged for those results, but they were discharged the equivalent of 300k miles.
