dcarleaf
Posts: 12
Joined: Sat Mar 05, 2016 2:54 pm
Delivery Date: 04 Mar 2013

Re: 12v battery dies repeatedly

Wed Jan 04, 2017 10:57 am

The dealer ran diagnostics overnight and found nothing drawing on the battery, and the car started fine this morning. Could this be simply a problem of leaving the car plugged into the charger all night, even after the charge is complete? I tend to do that in winter so I can run the heat in the morning while the car is still on the charger, and it has never been a problem before, but I'm wondering now if that's the cause (which of course I'll test).

GerryAZ
Gold Member
Posts: 1250
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: 12v battery dies repeatedly

Wed Jan 04, 2017 12:39 pm

Leaving the charging cable connected overnight should not be a problem unless the 12-volt battery is really weak. It will discharge the 12-volt battery a bit, but should not cause an issue unless it is plugged in for a longer period of time (perhaps 36 hours or longer).

Gerry
Gerry
Silver LEAF 2011 SL rear ended (totaled) by in-attentive driver 1/4/2015 at 50,422 miles
Silver LEAF 2015 SL purchased 2/7/2015

SageBrush
Posts: 744
Joined: Sun Mar 06, 2011 2:28 am
Delivery Date: 13 Feb 2017
Location: Colorado

Re: 12v battery dies repeatedly

Wed Jan 04, 2017 2:44 pm

dcarleaf,

Ask your dealer for the actual 12v draw amount through the night. If it cannot be provided I would be skeptical that they know what they are talking about.
2013 Model 'S' with QC & rear-view camera
Bought off-lease Jan 2017 from N. California with 63.9 Ahr after 22k miles
Car is now enjoying an easy life in Colorado

dcarleaf
Posts: 12
Joined: Sat Mar 05, 2016 2:54 pm
Delivery Date: 04 Mar 2013

Re: 12v battery dies repeatedly

Thu Jan 05, 2017 5:52 pm

They were able to give me the draw, but they didn't find anything unusual. They ran diagnostics for two days and nights--on the charger and off. The car started for them every time. I'm at a loss at this point. I've ordered a portable battery jump starter and will try to continue diagnosing it on my own. I appreciate all the good suggestions y'all gave me. Thanks.

arnis
Posts: 710
Joined: Sat Jan 23, 2016 3:21 pm
Delivery Date: 23 Jul 2014
Leaf Number: 015896
Location: Estonia, Europe

Re: 12v battery dies repeatedly

Fri Jan 06, 2017 2:20 pm

Disconnect OBD adapter if you have that.
Check battery terminals. They must be clean and not wiggling.
Get a hold of multimeter, open the hood and lock the car. Leave it to charge.
Check voltage every few hours. Write down.
Continue checking voltage after charge cycle ends.
Report.
Short range EVs <30kWh -- Medium range: 30-60kWh -- Long range: >60kWh
Charging: Trickle <3kW -- Normal 3-22kW -- Fast 50-100kW -- Supercharging >100kW

dcarleaf
Posts: 12
Joined: Sat Mar 05, 2016 2:54 pm
Delivery Date: 04 Mar 2013

Re: 12v battery dies repeatedly

Sun May 28, 2017 1:28 pm

Update on this situation: From January 5 until May 27, the Leaf ran as it always had--no dead 12v at any time. On May 27 in the afternoon, it's suddenly dead again. This time I had a battery pack that I used to jump it, but I would prefer not to do that too often. The only common denominator I can find among all the instances (though this may not be relevant) is that in every case (if I recall correctly), two or three days before the dead battery occurred, the car had been in the shop for some sort of maintenance and the 12v was disconnected during the maintenance. Why it would happen two or three days after that, I have no idea, so I suspect it's not the cause. I'm still stumped, though.

cwerdna
Gold Member
Posts: 6720
Joined: Fri Jun 03, 2011 4:31 pm
Delivery Date: 28 Jul 2013
Location: SF Bay Area, CA

Re: 12v battery dies repeatedly

Sun May 28, 2017 3:18 pm

Each time you jump start the car from a dead battery, your actions after that (driving somewhere, or rather car in READY mode (green car w/arrows icon), charging via L1 or L2 EVSE may not be sufficient to charge up the 12 volt completely. After all, we already know the 12 volt charging algorithm on the Leaf is crap.

And, unfortunately, running a lead acid battery flat can be bad for it.

I'd suggest getting a 12 volt charger to separately charge up the 12 volt. I have one of the Tecmate Optimate 4's (https://tecmate.com/?post_type=products ... y-chargers). I have no idea what would happen if you charged on L1 and L2 while using this, so I'd recommend not doing that. I charge connected to the + post and have black connected to the black wire connection attached to the PDM stack, instead of the battery's negative post.

'13 blue Leaf SV w/premium package (owned)
'13 blue Leaf SV w/QC + LED & premium packages (lease over, car returned)
'06 Prius

User avatar
Stanton
Forum Supporter
Posts: 1901
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
Contact: Website Twitter

Re: 12v battery dies repeatedly

Sun May 28, 2017 4:13 pm

dcarleaf wrote:...the car had been in the shop for some sort of maintenance and the 12v was disconnected during the maintenance. Why it would happen two or three days after that, I have no idea, so I suspect it's not the cause. I'm still stumped, though.


Because that's how long it took for what little charge was left in the battery (after they probably "topped it off") to drain. This happened to me when my battery pack was replaced. Bottom line: once a 12v battery is "drained" the damage is often irreparable.
2011 Blue Ocean SV w/floor mats & window tint
12v LiFePO4 battery & FIAMM 74100 horns
Wet Okole seat covers (front)
Tor's low-power heater mod
2013 sun visor
3G modem upgrade
L2 EVSE Upgrade
Battery Pack replaced (Rev E) @51 months and 41k miles

User avatar
jlv
Posts: 421
Joined: Thu Apr 24, 2014 6:08 pm
Delivery Date: 30 Apr 2014
Leaf Number: 424487
Location: Massachusetts

Re: 12v battery dies repeatedly

Tue May 30, 2017 6:52 am

Just wondering: Have you had the TCU updated?
'13 SL+Prem (mfg 12/13, leased 4/14, bought 5/17)Tesla S 75D (3/17)
Model 3 reservation
(Probably no LEAF2 for me)

powersurge
Posts: 612
Joined: Wed Oct 21, 2015 10:24 am
Delivery Date: 06 Dec 2014
Location: Long Island, NY

Re: 12v battery dies repeatedly

Tue May 30, 2017 7:06 am

I suggest that all leaf users with this concern get the following items... 1) a "Battery Tender" battery charger. It charges slowly, and you can leave it plugged into the 12v battery for months at a time because it is computer controlled. 2) Get a Harborfreight battery tester that you can do a "load test" on the battery to be assured that the battery has a good voltage, and then that the battery is good and can deliver when a heavy load is placed on it.. .. (Diagnostics 101).

I cannot imagine that the original poster put in a brand new, fully charged battery, and the battery was dead in only 1 day. If that is true, then you can test with an ammeter to see how much current is being drawn from the battery when the car is completely "off". This issue is a common one with cars, and should not be a "murder mystery"..... good luck...

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