RegGuheert wrote:Did you let the car sit for an hour or so without opening the doors (like to pop the hood)? If you took the measurement right after popping the hood, then this is about the voltage I would expect with the car loading the battery.
I have monitored the voltage on many many occasions - even with the battery disconnected and "settled". It seems to range between 12.3 to 12.4. After an extended "trickle" charge it does go to the 12.7+, but after any "normal" driving situation of several days, it settles back to the lower voltage ~60% SOC best as I can tell. Based on the work done at the start of this post - understanding the charging voltages, it all makes sense. IMHO, the NIssan engineers (for a 2012 at least) designed for a 70% + SOC "normally" to prevent too much sulfation and knowing that the 12 volt battery loading is mostly minimal, the high quality battery would last OK! I did confirm that mine is the original battery - almost 4 years old, so probably a reasonable balance of low 12 volt energy use and longevity of the battery. Again IMO - certainly welcome any other opinions! Any Nissan engineers want to chime in?
I'm going to try and find a used Northstar Blue 40 AH telcom battery and try it - cannot afford a new one!
BTW, The "wiper" use likely is way too short to do any significant charging - again IMO! We have had plenty of rain here in South East Texas!!!
2012 Leaf SL; 43,000 miles. Battery replaced November 1st, 2016.