The Adjustment (Updated from April 30, 2018)

 The new Gen 2 batteries promise to not only deliver more range but will also be more robust lasting longer with a better chemistry. 

Well, at least that was the promise. I was buzzing along seeing a very slow drop in stats after taking the car off the lot a few months ago. As always I try to get a car that whose battery is less than a month old so my build date of 01/18 was perfect when I picked up the car in Mid February. 

As always, I was logging LEAF Spy readings every morning (that I drove the car) and unlike the Gen 0ne packs that bounced around all over the  place making it nearly impossible to see how the pack was doing, my Gen 2 pack was moving like Molasses. It was actually quite boring. Losing .01% here and there a few times a week. I figured it would be more than 6 months to lose one percent but then one day I checked it and...

I had lost over ¼% OVERNIGHT!  What happened? That was more than what I had lost in the first 4,000 miles and 2 months of driving!  But that was only the beginning. The next day it was another .38% loss and it kept going and going.  When the dust finally settled a week later, I had lost almost 2%. 

I quickly verified this with a full charge reading and yeah; GIDs and kwh available also dropped accordingly. 

I wondered what did I do wrong?  How come the stats NEVER go up like they did on the Gen Ones? At first I thought maybe I was DC'ing too much. After all, its free and hard to resist plus with working all over the Puget Sound Region, sometimes a full charge wasn't enough so boosting it during the day became a common habit. I have work I need to do to complete any assignments so I would simply stop, plug in, get the work done then go.  This saved me from having to cut into my home time to do it so it was a win-win. 

Although hot weather hasn't been a factor yet, I did do a few trips when the pack got heated to 10 temperature bars but only a few times. So guess we will continue to monitor. 

EDIT  (10-15-2018) 

Back again and yeah, it has happened again and seeing a pattern here.  Unlike Gen 1's, the stats NEVER go up. Only a slow decline or no change.  I have gone thru 2 more adjustments and they are coming in once every 3 months AND Aligned with my build date (01/18)   Interesting! 

I have to admit I am "not" concerned with the rapid drop having lost over 5% in nearly 12,000 miles simply because this is new chemistry which was supposed to hold up better. There is also a major revamping of the BMS control over DC charging (unfortunately) slowing the charge rate much earlier than my 30 kwh to reduce heat buildup.  I suspect the rate of degradation will slow dramatically in year 2.