vladm2018 wrote:I put a voltage meter in my 12V plug and monitored it through the day. When the car is ON and moving, the voltage is 13-14V as normal for most of the cars. Just switched OFF it is about 12.7V. What is interesting is when the car is ON without starting battery (no brake pedal pushed) it drains battery very fast. I thing the whole battery could be drained in about 30 minutes.
You might simply monitor it with nothing on after a fresh charge. Even a decent battery will rapidly drop some voltage immediately after JUST being charged. It slows down and levels off after awhile. That state is more revealing than right off the charger, and maybe a bit warm.
For example, noting that this is a 4 year old battery but with only 11K miles on the Leaf.
Immediately after a fresh full night charge on a battery tender - 13.06v
A few minutes after disconnecting - 12.88v
After sitting all day in a cool garage with nothing on - 12.32
From my limited experience it'll sit at that level or close for days.