Temperature seems to be the largest factor.
Zero Emissions button --> Settings --> Long Life Mode (80% charge) --> ON
Tips:
* Don't do multiple quick-charges in a short amount of time.
* Try to garage or shade it when parked
* Charge to 80% when you don't need the car for a long tip
* Don't charge if there are more than six in battery temp bars or lower than two
* Lifting your foot off the accelerator rather than hitting the brakes.
Also you can set the charge timer (if you wish) by pressing the blue “e” Zero Emission button to the lower left of the navigation screen. This will bring up your
selection menu. You can select a 100% charge, or an 80% charge. You can set the charge to start and/or stop at any time you wish.
I am charging to 100% every time. Most people feel that stopping at 80%, so I wouldn't and don't worry about that.
Driving and charging habits from http://livingleaf.info/2012/07/care-and ... f-battery/
NISSAN recommends you use the following driving and charging habits, where possible, to help maximize the battery’s useful life:
* Avoid exposing a vehicle to ambient temperatures above 120°F (49°C) for over 24 hours.
* Avoid storing a vehicle in temperatures below −13°F (−25°C) for over 7 days.
* Avoid leaving your vehicle for over 14 days where the Li-ion battery available charge gauge reaches a zero or near zero (state of charge).
* Allow the vehicle and Li-ion battery to cool down after use before charging.
* Park/store your vehicle in cool locations out of direct sunlight and away from heat sources.
* Avoid sustained high battery temperatures (caused, for example, by exposure to very high ambient temperatures or extending highway driving with multiple quick
charges).
* Use the normal charging or trickle charging methods to charge the Li-ion battery and minimize the use of public Fast Charge or Quick Charger.
* Avoid sustained high battery state of charge (caused, for example, by frequently charging to 100% state of charge and/or leaving the battery above 80% state of
charge for long periods of time).
* Allow the battery charge to be below at least 80% before charging.
Moderate driving.
* Use of ECO mode.
* NISSAN recommends charging the batteries using the long life mode unless the vehicle is going to be driven a long distance. See “Charging timer” in the “CH. Charging”section.
* If the vehicle will not be used for an extended period of time, charge the Li-ion battery using the long life mode once every 3 months. Do not operate the charging timer repeatedly while the charge connector is connected to the vehicle after the Li-ion battery charging is completed. Doing so may discharge the 12-volt battery. The power of the Li-ion battery can be checked on the Li-ion battery available charge gauge. See “Li-ion battery available charge gauge” in the “2. Instruments and controls” for details.
