No doubt there is seasonality to Ah-hr readings but my more moderate, 4 season Colorado experience is quite different than yours:Marktm said:Below is the "degradation" in amp-hours for my 2012 Leaf with a replacement "Lizard" battery in Nov. 2016. Totally different climate, similar usage (light), garage stored, L2 charging only. However, the seasonal ups/downs are so consistent (will have the third "hump" in a couple of months) that indicates (in my case) that the slow average shift in battery temperatures has a significant influence on amp-hr readings.
Since you have only points in time readings - at essentially the same time of the year, the "seasonal" ups and downs are not likely influencing your perceived degradation. However, I would recommend that you do a similar "plot" in the future to understand better how much seasonal variation in your situation exists. It is possible you will see significant "recovery" due to higher average battery temps in the spring/summer/fall. In Houston, we don't have anything but summer except for 3 months of cold,wet winter :mrgreen:
BTW, the amp-hr reading is above 54.5 currently - and we have had a relatively cool spring - so I expect a fairly sharp rise in the next couple of months.
No uptick from March; if anything that is when my battery Ah-hr drops !
YOY is helpful.