Annual Battery Check results in lower Ahr and health

[IraqiInvaderGnr]

3-25-14 AHr=62.49 SOH=95% Hx=97.97% Odo=19,783 2QC & 1338 L1/L2

3-24-14 AHr=67.36 SOH=100% Hx=111.05% Odo=19,726 2QCs & 1330 L1/L2

I took my car in for a annual battery check and for some reason all my values dropped on LeafSpy app. Does anyone have any reasoning for this? Just find it odd that there was that much of a drop.

 

[bradbissell]

Did they also reprogram the PDM? This is a recall item on 2013s. That might reset the numbers and lead to new values. They will probably return close to their prior values over time.

 

[IraqiInvaderGnr]

I've no idea if they did but the values did return to normal this morning. AHr=67.36 SOH=100% Hx=112.82. I also noticed something strange the L1/L2 value increased by 4 instead of one even though I only charged once and don't use climate timer.

 

[klapauzius]

That same thing happened to me last year, although mine is a 2011 and it was 2 years old at the time.
Mine was reporting 65 AH capacity back then, which was not realistic.
So the car itself sometimes overestimates capacity, but what influences these estimates is a mystery to me...I thought there were seasonal changes, i.e. lower estimates at higher temps and higher estimates in the cold, but I could not confirm this.