gshepherd
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Joined: Wed Apr 27, 2016 12:01 am
Delivery Date: 03 Jun 2016
Location: Seattle / Phoenix

Re: 12v Battery -- Leaf storage for four to five months

Tue May 23, 2017 9:44 pm

EVger wrote:I am planning to leave my Leaf in the garage for four to five months. I would appreciate some information:
Can I just leave the car without the 12v likely to go dead? (Does the electrical system go to sleep and/or does the 12v draw a charge from the traction battery, but not so much as to dangerously drain the traction battery over several months?)
Should I leave the EVSE plugged in to charge the traction battery? (Which would probably maintain a 100% SOC on the traction battery for a considerable time.)
Should I use a battery tender for the 12v battery? If so, what is the most convenient way to make the connection? (Just use the alligator clips? On the negative terminal or the car frame?)
Thanks for your help.


Based on the admonishment I the manual to not leave the LEAF main battery at high charge for extended periods of time, I left my 2016 SV at 60%. I also left it unplugged as that is one less thing subjected to lightning strikes and brown outs on the grid. I did have a Battery Minder desulfating maintainer connected to the 12V battery (yes, that was connected to the grid).

Upon return six months later, the main battery was at 59% and the same capacity as before I left. Always good to check the 12V battery electrolyte levels and top up with distilled water if necessary. First "battery report" from the dealer gave five stars across the board. Interestingly the "extended time at high state of charge" seems to be removed from the report.

I believe the 2015 and newer models top up the 12V battery every 24 hours for five minutes if not driven or charged. I've seen mine do this. Perhaps the battery maintainer was overkill. Nevertheless, it all worked out for my Seattle to Phoenix snowbirding. Granted, my LEAF was stored in practically ideal temperatures.
2016 LEAF SV

LeftieBiker
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Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12v Battery

Tue May 23, 2017 10:34 pm

Interestingly the "extended time at high state of charge" seems to be removed from the report.


Presumably because they no longer give the option to charge to 80%.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

GerryAZ
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Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: 12v Battery

Wed May 24, 2017 2:51 am

EVger,

If you leave the car at 60% to 70% state of charge and not plugged in, it will be fine in moderate or warm temperatures. In extremely cold temperatures, higher initial charge would be OK since it might need to run the battery heater down near 0 degrees F. Make sure there is nothing plugged in to the OBDII port, nothing is left on, and all doors are closed (and locked, if desired). I have parked my 2011 and 2015 for up to 3 weeks at my office or the airport numerous times without issue (except the one time I left the Bluetooth adapter plugged in to the OBDII port on the 2011 and came back to a dead 12-volt battery after only 6 days). The SOC of the traction battery is essentially the same after 3 weeks as when it was parked. According to the manual, the 2011 would charge the 12-volt battery for 5 minutes every 5 days. The manual says the 2015 will charge the 12-volt battery periodically as necessary so I think it monitors the voltage instead of just charging every 5 days. In either case, both cars keep (kept) the 12-volt battery adequately charged.

A "battery tender" is OK if you are comfortable leaving something plugged in unattended for that long, but I personally do not trust them so I either periodically charge batteries on other vehicles or disconnect them to prevent discharge. I like the fact that I don't need to do anything with the LEAF except make sure it is parked at half charge.

Also, the telematics unit and CarWings (EV Connect) go dormant after the car has been parked for 2 weeks so do not be alarmed when you cannot check status remotely (SV and SL models).
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

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Marktm
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Posts: 359
Joined: Thu Jan 21, 2016 10:49 am
Delivery Date: 09 Jan 2016
Leaf Number: 022737

Re: 12v Battery -- Leaf storage for four to five months

Wed May 24, 2017 5:16 pm

EVger wrote:I am planning to leave my Leaf in the garage for four to five months. I would appreciate some information:
Can I just leave the car without the 12v likely to go dead? (Does the electrical system go to sleep and/or does the 12v draw a charge from the traction battery, but not so much as to dangerously drain the traction battery over several months?)
Should I leave the EVSE plugged in to charge the traction battery? (Which would probably maintain a 100% SOC on the traction battery for a considerable time.)
Should I use a battery tender for the 12v battery? If so, what is the most convenient way to make the connection? (Just use the alligator clips? On the negative terminal or the car frame?)
Thanks for your help.


My experience is with a 2012 Leaf with the original 12V battery. After joining this forum over a year ago, I began to read about isolated incidents of completely dead Leafs due to failed batteries. It got me more than a little worried. After a series of "tests" I concluded that for my vehicle, the "charging" system was certainly not optimum (never truly "floated" nor "equalized" the FLA battery). My best (test) guess was that the SOC was maintained at 70% or less almost all the time - marginal for sulfation prevention. My solution has been to use one of the Northern Tool $25 desulfating trickle charger if I do not use the Leaf for more than a week or so, equalize the battery every couple of months, and keep my amazing 12 ahr lithium battery "jump starter" in the trunk ( I have one to start my 6500 watt generator).

If I were to leave my Leaf for several months, I'd first fully charge the battery with a conventional 15+ amp charger, then put the trickle charger on it - if nothing else but to actually float it and possibly even desulfate it (although I have no proof that they actually work!). My battery has never failed me (yet).
2012 Leaf SL; 36,000 miles. Battery replaced November 1st, 2016.
Rural cabin with 6750 watts Grid tied PV. Off-grid solar Leaf charging capable (level II).

camasleaf
Posts: 611
Joined: Sun Sep 26, 2010 5:20 am
Delivery Date: 17 Jun 2011
Location: Camas, WA

Re: 12v Battery

Tue May 30, 2017 8:00 pm

I had to replace the 12V battery in the 2011 SLe Leaf, 6 years without 2 weeks. I bought the Costco battery for $73.

I was abroad for 3 weeks and my wife forgot to use the car or power it up. She also looked for something inside for an hour and left the light on. The battery was dead when I came back. I charged it and it worked for a week with daily use. Over the weekend, not being used, it died again.

The car is parked outside during the day 11 hours, 4 days a week, the little solar panel likely helped extending the battery life. In garage overnight. Short trips over the 3 day weekends.
2011 SLe 06/17/11 Over 76000 miles 71%SOH 15.7kWh
2015 SV 09/02/14, Over 36000 miles soon to be returned for a 2018
5.7kW DC System

LeftieBiker
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Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12v Battery

Tue May 30, 2017 9:02 pm

I've been trying for 2 years to get a Nissan dealership to add distilled water to my 12 volt battery. Usually they just don't do it, but today they told me that the car has a maintenance free battery. I guess I'll have to do it myself.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

Lambtron
Posts: 61
Joined: Mon May 25, 2015 12:39 pm
Delivery Date: 05 Aug 2011
Leaf Number: 6977
Location: North Las Vegas, Nevada

Re: 12v Battery

Sun Sep 24, 2017 10:18 am

LeftieBiker wrote:Even a Battery Tender Jr, with a whopping 0.75 amps, will keep a Leaf battery charged if given long enough. I'm using one now, and it usually only takes an hour or two to top off my battery.


Can this, while being connected to battery positive and Chassis ground be used at the same time as Traction battery charging or will it screw something up? IE: Do they need to be charged separately?

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Marktm
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Posts: 359
Joined: Thu Jan 21, 2016 10:49 am
Delivery Date: 09 Jan 2016
Leaf Number: 022737

Re: 12v Battery

Sun Sep 24, 2017 11:13 am

I've actually hooked up a 15 amp battery charger (as well as the "tender") while the Leaf is "started" - just to see the effects of battery voltage and current flow with LeafSpy - no apparent affect on any operations.
2012 Leaf SL; 36,000 miles. Battery replaced November 1st, 2016.
Rural cabin with 6750 watts Grid tied PV. Off-grid solar Leaf charging capable (level II).

LeftieBiker
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Joined: Wed May 22, 2013 3:17 am
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Location: Upstate New York, US

Re: 12v Battery

Sun Sep 24, 2017 11:28 am

Lambtron wrote:
LeftieBiker wrote:Even a Battery Tender Jr, with a whopping 0.75 amps, will keep a Leaf battery charged if given long enough. I'm using one now, and it usually only takes an hour or two to top off my battery.


Can this, while being connected to battery positive and Chassis ground be used at the same time as Traction battery charging or will it screw something up? IE: Do they need to be charged separately?


I charge them together all the time. No problem.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

lorenfb
Posts: 1407
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: 12v Battery

Sun Sep 24, 2017 11:44 am

LeftieBiker wrote:
Lambtron wrote:
LeftieBiker wrote:Even a Battery Tender Jr, with a whopping 0.75 amps, will keep a Leaf battery charged if given long enough. I'm using one now, and it usually only takes an hour or two to top off my battery.


Can this, while being connected to battery positive and Chassis ground be used at the same time as Traction battery charging or will it screw something up? IE: Do they need to be charged separately?


I charge them together all the time. No problem.


Hopefully whatever charger/maintainer's is used, that the output 'floats' (isolated) relative to the 110V line.

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