Leaf battery degradation case A: AZE0 24 kW⋅h—part 2 2020-10

Posted on 11 January 2021 in Electric vehicles

Part 2 in a series following the state of health (SoH) degradation of a Nissan Leaf AZE0 24 kW⋅h battery.

Vehicle specification:

Articles in the series Nissan Leaf battery degradation case A: AZE0 24 kW⋅h:

Summary

2019-10/2020-10
Period	Distance	∆SoH
12 months	8 421 km	−2.77 pp

A series of DC fast charges gave the SoH a temporary boost of 4.10 percentage points.
In the year ending October 2019 the vehicle travelled 8 421 km and the SoH reduced by 2.77 percentage points.

Battery parameters were recorded using Leaf Spy for Android. The table below shows the battery parameters for the year ending October 2020.

Battery degradation 2019-10/2020-10 as recorded by Leaf Spy.
Date	Odometer (km)	A⋅h	SoH (%)	Hx (%)	Fast charges	Type 1,2 charges
2019-10-07	31060	55.31	84.53	77.15	12	1160
2019-10-12	31873	57.96	88.63	83.85	21	1173
2019-10-20	32013	57.05	87.24	82.10	21	1176
2019-10-27	32184	56.45	86.32	80.94	21	1178
2019-11-03	32322	55.99	85.61	80.04	21	1179
2019-12-01	33031	55.16	84.35	78.46	21	1189
2019-12-09	33309	55.28	84.52	78.67	22	1192
2019-12-15	33463	55.05	84.18	78.24	23	1199
2019-12-22	33661	55.90	85.47	79.87	25	1206
2020-03-10	35585	54.45	83.26	77.15	25	1275
2020-08-23	38123	54.09	82.71	76.50	27	1359
2020-10-25	39481	53.48	81.77	75.38	27	1396

The count of Type 1 and 2 charges is higher than actual due to the Leaf's built-in charge timer recording one charge when the vehicle is plugged in, and a second when the timer initiates charging.
The increase in SoH from 84.53% to 88.63% in October 2019 is due to nine quick charges with in a 36 hour period while making the delivery journey.
In the year ending October 2019 the vehicle travelled 8 421 km and the SoH reduced 2.77 percentage points.
Vehicle was parked under cover.