Thanks Doug for the follow up.
Roadster Owner Based Study of Battery Pack Capacity Over Time and in there are instructions about using the log parser and it will also talk about how to view the "weakest" sheet (group of cells). The sheet number should change over time. If it doesn't then that means you have a bad sheet and should take it in to Tesla.
Twilight Blue Roadster 2.5 - #1098 / Grey Model S Performance - #1459
Now, with 41K miles on the car (and so ~32K miles on the battery) it's charges up to somewhere in the 182-187 range (again after letting it sit for a while after the charge completes). I think that the replacement battery I got was a good one.
Thanks bolosky, that's a great data point and information on balancing the battery pack!
What was the the reason for the battery pack
My 1.5 Roadster just reached 15,000 miles yesterday. After last night's standard mode charge the ideal range showed 187 this morning. Over the past year and 9,500 miles that I've owned this car, the highest ideal range I recall seeing is 189 so there has been very little reduction in range during this time.
Each morning I check the ideal range and it's typically 186 or 187 miles. Tuesday morning it showed a new low of 185 so I figured it was the beginning of the expected range reduction due to the age of the car and mileage. I was pleased to see it back to 187 this morning!
The factors around my daily observations are fairly consistant day to day. The car begins charging at 1:00am, I head out for the day about the same time each morning after checking the recharge went OK and note the ideal range estimate, then return home that evening with about 110 miles of range left so the amount of daily recharge has little variation.
In any case, the 185 - 187 mile ideal range more than meets my needs (plus I have hcsharp's cool J-1772 adapter in case I happen to need a recharge along the way!).
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