Hi Phil, I forgot to write it down when I measured, but it was low enough that there was essentially no charging current, so I think closer to 13V. As a hack to keep my older battery charged, I disconnected the current sensor on the aux battery terminal, so the car would constantly see a large (negative) current from the bidir sensor that I think outputs a 0-5V for something like -100 to +100 A of measurement, 0A being in the middle so 2.5V. I still use that hack today, to keep my smallish Lithium aux battery charged up to 14V.
Oh, when I check old screenshots of LeafSpy, then it shows either 12.96 or 13.04V, I presume that is the ADC resolution (0.08V on a 5V range means 6 bits??) and a charge current of 1A. Without sensor connected, it shows 13.92V at a reported current of -105.37A due to the unconnected sensor input. Cor. On Sun, Aug 2, 2026, 11:02 AM (-Phil-) <[email protected]> wrote: > Yeah, they didn't implement a proper temp-compensated 3-stage, but I > remember the float being 13.5v? (measured at the battery) Am I wrong? > > On Sat, Aug 1, 2026 at 11:16 PM Cor van de Water <[email protected]> > wrote: > >> Phil, >> Sorry but I got to correct you there, the Leaf will *charge* the aux >> battery for a short time after starting the vehicle, whether driving >> or charging (when contactors are closed, as you write), HOWEVER, as >> soon as the charge current drops below 10 Amps and on an older battery >> that is almost instantly, the DC/DC stops charging it and switches to >> a maintenance voltage which will essentially NOT charge the 12V >> battery any further. If I am not mistaken, the charge voltage is 14V >> and the maintenance voltage is at or below 13V which means that almost >> no current is absorbed by the aux battery, which is what you WANT for >> a fully charged battery, but since an older battery can be almost >> empty but due to not accepting 10 Amps of current at 14V, it will get >> 13V and stay essentially empty the whole time, that is why Leaf >> batteries die early. They never properly get charged, let alone >> balanced (occasionally overcharged to re-balance the 6 cells) by the >> car. >> >>
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