There may well be others, but when you stop the car and the battery is 2+ AH down from full, the car isn't adequately charging the accessory battery.lorenfb wrote:Try turning "on" the wipers while monitoring the battery voltage. This is one of the undiscovered charging
modes that the Leaf enters into, i.e. mentioned up-thread that anecdotal data takers failed to find,
where it charges greater than 14 volts. What other modes exist in the Leaf's charging algorithm that have
been overlooked where the Leaf charges greater than the 13 volts normally observed?
I have left my battery charging on two - 1 amp chargers for over 24 hours and the red light was still on - and both were very warm. I was actually surprised as I was expecting them both to go to "maintenance" (flashing green, no red) in about 1/2 that time based on the battery size (~40 AH?) and estimated SOC (from settled voltage curve). The charge voltage was 13.5 +, but I had no way of determining if the Leaf had any substantial drain during this charging - should have disconnected it.LeftieBiker wrote: How about a little input from others who use battery maintainers? How often does the maintainer go into full charge mode (usually a solid red light) when you connect it, how often into finish charge mode (flashing green or solid yellow) and how often do you connect the battery and it's either green (float) immediately, or within a minute or so?
Right, one always needs to first check the standby current (drain) to be assured that there's no parasitic drainMarktm wrote:
The charge voltage was 13.5 +, but I had no way of determining if the Leaf had any substantial drain during this charging - should have disconnected it.
Lost track - Is this the same battery that originally failed, or a replacement? If nothing is wrong with your Leaf's 12 volt system, I'd guess you have a bad cell in your battery - which should show up in the dealer's load test equipment.erichz wrote:Well, my 12v battery died again unexpectedly. I've now taken it to the dealership for testing to see if there's a slow drain somewhere, or (more likely) the battery itself is just not being charged sufficiently on shorter trips.
Might want to take it to a trusted mechanic that has a battery load tester and explain what has happened. See if the battery is definitely OK.erichz wrote:Got the car back from the dealer with no resolution. Their tests turned up no problems with either the 12v or a parasitic drain after 4 days of looking.