jonathan18:

 

Wow, that is a significant number! When we sold my wife's Leaf after six years of ownership it still had the battery it came with (unsure how old that was but it was Japanese; we were the first NZ owners). 

 

Then again, when we sold it the HV battery had degraded to something like 7 or 8 bars from 12, and I know which of these problems I'd rather have...

 

I had to replace the 12v battery in mine after about a year of ownership. The battery would have been about 6 years old if original so normal life expectancy for mine.

I've been seeing about 1.7% per year degradation on my HV battery. SOH goes down about 5% summer to winter but then bounces back about 3% winter to summer. I keep my HV battery at about 60% SOC as much as I can. I charge it up to 60% when I get home from work using the timer in my phone. It takes about 10% SOC an hour of charging and 6 minutes per 1% using the granny charger. So, it's easy to work out how long it needs to charge to reach 60%. The charge timer is programed to top it off to about 80% just before I leave for work, and it is back down to about 60% when I get there. This regimen keeps the battery at about 60% SOC for about 19 hours per day, the rest of the time it is either charging or discharging.