GerryAZ said:
The original 12-volt battery seems to be fine now, but I probably shortened its life by completely discharging it.
Gerry
Make sure your Nissan service department does a capacity test of the 12V battery prior to 3 years, 36,000 miles. Running it to dead cannot have been good for it.
The 12V battery is covered for full replacement up to 3 years, 36,000 miles.
My service department checked my 12V when I had the second annual main pack "test" done, and the 12V capacity was very bad. They replaced it under warranty at no cost to me.
My 12V battery was likely impacted by having the LEAF in On instead of Ready while listening to the radio for lengthy periods. Although the DC to DC will activate periodically in On mode and charge the 12V battery, it lets the 12V voltage drop too low before doing this.
Any extended use of the 12V system needs to be with the LEAF in Ready mode.
Although a lot of people have not killed the 12V with 3 or 4 weeks of non use of the LEAF, others have had problems with doing this.
Anything more than a week, I would recommend disconnecting the 12V or having it on a good quality battery maintainer.