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2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 7:45 am
by Phatcat73
I've owned my 2013 SV for over a month now. I took it in about 3 weeks after ownership due to waking up to a dead 12-Volt Battery. Dealer replaced the battery. They said the OBC tested fine. Now two weeks later, same thing. My 12-Volt registers 5-Volts on my multimeter.

What would cause the 12-Volt to drain? Doesn't the car "go to deep sleep" after shutting it off? I usually leave my keys in the car (garaged). Does the transponder being in vicinity of the car cause it to drain?

Baffled?!?

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 8:16 am
by garygid
Do you drive it daily?

Driving or Charging should charge the 12v Battery.

So, I you drive most days, it sounds like the 12v Battery is not getting charged,
or there is an unusual current drain. The dealer should be able to easily measure
the current drain without the "keys" in the car, and see if there is an
abnormal drain. Then, in the same test, toss the keys in and see what happens
to the current.

I would think that the RFID overnight, or for a day, would
not be a problem, but... try not doing that. :D

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 9:10 am
by Phatcat73
I drive it daily and it was plugged to my L2 charger overnight.

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 9:15 am
by RegGuheert
If you have a voltmeter, I suggest putting the car in READY mode, in park, and measuring the voltage at the battery. You should see either 14.4V or 13.1V. Anything lower than 13.0V in READY mode would seem to indicate the DC-DC converter is not charging the battery properly.

But I do think that leaving the fob in the car overnight might be what is draining the battery in the car. In any case, that will likely drain the battery in the fob.

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 9:24 am
by ampitupco
RegGuheert wrote:But I do think that leaving the fob in the car overnight might be what is draining the battery in the car. In any case, that will likely drain the battery in the fob.
I've been doing this for over a year. No issues with my 12v battery or fob battery yet.

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 9:24 am
by TomT
I've regularly done this for a long time and it has had no affect on either the fob or the 12 volt battery.
RegGuheert wrote:But I do think that leaving the fob in the car overnight might be what is draining the battery in the car. In any case, that will likely drain the battery in the fob.

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 9:32 am
by Ingineer
The OBC does not charge the 12V battery, ever. The component that does is the DC-DC converter. It's right under the aluminum cover next to the OBC, but it's a different beast. Easy enough to check it as others have already posted.

I'd suggest NOT leaving the fob in or near the car. Keep it with your wallet inside.

-Phil

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 11:22 am
by Phatcat73
RegGuheert wrote:If you have a voltmeter, I suggest putting the car in READY mode, in park, and measuring the voltage at the battery. You should see either 14.4V or 13.1V. Anything lower than 13.0V in READY mode would seem to indicate the DC-DC converter is not charging the battery properly.

But I do think that leaving the fob in the car overnight might be what is draining the battery in the car. In any case, that will likely drain the battery in the fob.
Thanks. Great idea. I put it in ready mode mode and read 14.4 Volts. I'm at a loss. I'll keep the fob out of the car and see if that changes anything.

Any other ideas? Should the Leaf go into deep sleep as most cars do after X minutes? My Escape goes into a deep sleep after 12 minutes. Door ajar light, headlights, etc... all shut off.

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Sun Apr 21, 2013 1:18 pm
by Nubo
Sounds like there is a ghost load somewhere. May take a bit of detective work with a meter to track down which circuit is involved.

Re: 2013 Leaf - Dead 12-Volt Battery every 2 Weeks

Posted: Thu Apr 25, 2013 7:44 am
by Phatcat73
Dead again this morning - 12V registered 5V and I needed another jump. This time I didn't leave the key fob in the car all week since the last time it died - 4 days ago. It appears to only die in my garage overnight, whether the car is plugged to my L2 or not. This morning I also had a 72% charge whereas I normally set it to charge to 80%.

She's going in tomorrow. This will be my 5th trip to the service dept since purchasing the Leaf on 3/6. I still love the car, but am seriously concerned at driving one of the first production cars out of Smyrna. Car was built on 1/24.