GerryAZ wrote:lorenfb wrote:Given all the hysteria on the Leaf's 12V battery, you'd think there would be answer to this one:LeftieBiker wrote:
The problem with the above is that the car makes no effort to FULLY charge the 12 volt battery even under optimum conditions. It either charges for a fixed amount of time or to a too-low voltage. As a result the 12 volt battery in a pre 2014 will be chronically undercharged unless you use an external charger once or twice a week...lorenfb wrote:
So the 2014+ Leafs have an improved charging algorithm? Haven't heard of this before, is it posted somewhere?
If so, are the pre-2014 Leaf's capable of having the ECU, e.g. the BMS, responsible for 12 battery charging re-flashed?
My 2013 has never had any 12 volt battery issues and I don't use a maintainer, although my SL with a PV cell
does supply about 50ma in moderate sunlight over the standby battery drain of about 30ma.
It may depend upon usage patterns, but my 2011 kept its 12-volt battery charged and my 2015 has been keeping its original Nissan 12-volt battery charged. The original battery in the 2011 lasted at least as long as typical OEM batteries last in my climate. The original battery in the 2015 is still OK so it is doing better than normal. I NEVER used an external 12-volt charger on either LEAF, but did have to jump start 2011 and 2015 one time each (left Bluetooth unit plugged in to OBDII port of 2011 while parked for extended time and upgraded telematics unit kept systems awake on 2015 while parked for a few days).
Thanks for the feedback on your Leaf, i.e. numerous factors affect a necessity to externally charge the 12V
battery. Given that you are/were somewhat technically involved with your present/past Leafs, have you
heard of Nissan changing the 12V battery charging algorithm in later Leafs?