islandbayy
Active Member
I would not say slightly different. Having less range after 9000 miles then my old pack did after 34,000 miles is astronomically different. It continues to drop. coming up to 10,000 miles on the replacement, and it's now hovering between 198 and 200.evidence is pretty conclusive that a) packs decline ~5% early in lifetime, b) then they stabilize and decline at very low rate, c) each pack is slightly different. You seem worried that new pack is slightly different from old and projecting linear decline. seems to me too early to be worried about too small a difference.
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Rate of decline has not changed. Almost at 10,000 miles, and now hovering between 198 and 200 miles. Must be a referb pack.OK, I see.. the concern is the rate of decline... is the rate of decline lessening at all after 9K miles?
My assumption is that this is a refurbished pack. And from those here who have had such pack replacements I believe that the stance Tesla takes is that you will receive a pack of comparable health/capacity.
Thus, I expect that the cells in the pack you got would have also already had ~34K miles worth of "wear" on them. Thus an additional couple of mile of degradation in nearly 10K wouldn't seem to be that out of the norm.
I also suspect that a refurb pack may present the car with an initial "learning curve" where the algorithm SOC estimate may need some time to acquire enough charge cycle sampling points to determine the actual capacity. This would make it appear the pack was rapidly losing capacity initially, whereas it may have been initial estimate error.
As for it already having ~34,000 miles of ware on it already when I got it, considering i have one of the highest mileage 60 cars, it would seem unlikely. Maybe a few thousand. Especially considering its a B pack, so manufactured quite a while after my 60 A pack was, gives it even less time to have mileage put on.
Learning curve, maybe, but after almost 10,000 miles, no sign of the range drop slowing or stopping. I even had a almost shutdown in terms of how low the pack got (got home with 2 miles left, and was unloading, didnt shut my drivers door all the way and heat and seat heaters stayed on. Didnt notice until a while later the pack was wayyyy low), and charged it from almost shutdown level to 100% as I had a lot of driving this holiday weekend. Weather was Abnormally warm, and charged at a high amperage. That gave a perfect time for it to measure power going back into the pack. It replenished ~54 kW roughly. In comparison, When this pack was new, a 100% charge from charge now would consume about 63kW.