lorenfb
Posts: 2427
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: DIY 12v Battery Change

Sat Apr 11, 2020 9:22 am

GerryAZ wrote:
Sat Apr 11, 2020 9:16 am
There is no need for Consult 3+ unless the HVAC compressor settings have been changed from factory defaults (unlikely unless someone paid a dealer to do it for improved cooling while stopped).
Presently, there're only two options to reset Leaf fault codes, the Nissan Consult tool or LeafSpy. That's why the Consult tool was mentioned.
Do you know of another option?
GerryAZ wrote:
Sat Apr 11, 2020 9:16 am
I recommend against connecting a booster battery to the terminals while replacing the battery.
And your reasoning is?
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F

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

Re: DIY 12v Battery Change

Sat Apr 11, 2020 10:25 am

DIagnostic trouble codes (DTCs) present due to failing 12-volt battery will probably be cleared by completely disconnecting the old battery and connecting a charged battery in its place. Connecting a booster battery will keep existing codes from clearing. CAN Bus errors often require disconnecting/reconnecting the 12-volt battery in addition to using Leaf Spy to get all DTCs cleared. Although I have used Leaf Spy to clear DTCs numerous times for other issues, I did not need to clear DTCs when I replaced the failed batteries in the 2011 and 2015. I plan to just disconnect the OEM battery and connect a new deep cycle AGM battery in its place in the 2019 as soon as the OEM battery starts getting weak.
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; traded 8/10/2019 at 82,436 miles
White LEAF 2019 SL Plus purchased 8/10/2019

lorenfb
Posts: 2427
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: DIY 12v Battery Change

Sat Apr 11, 2020 10:44 am

GerryAZ wrote:
Sat Apr 11, 2020 10:25 am
DIagnostic trouble codes (DTCs) present due to failing 12-volt battery will probably be cleared by completely disconnecting the old battery and connecting a charged battery in its place.
You totally missed the point! New fault codes may be developed the result of losing 12V power to some ECUs. Furthermore, some ECUs
may boot-up to their default states requiring the use of a diagnostic tool (possibly only the Nissan Consult tool).
GerryAZ wrote:
Sat Apr 11, 2020 10:25 am
Connecting a booster battery will keep existing codes from clearing.
That's totally another issue.
GerryAZ wrote:
Sat Apr 11, 2020 10:25 am
CAN Bus errors often require disconnecting/reconnecting the 12-volt battery in addition to using Leaf Spy to get all DTCs cleared.
Right, and a CAN bus error may occur while an ECU is communicating with another ECU when power is removed.
Hopefully the Nissan Consult tool won't be required, i.e. still requires another effort if just using LeafSpy.
GerryAZ wrote:
Sat Apr 11, 2020 10:25 am
Although I have used Leaf Spy to clear DTCs numerous times for other issues, I did not need to clear DTCs when I replaced the failed batteries in the 2011 and 2015.
That's anecdotal.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F

NewcastleFalcon
Posts: 5
Joined: Sat Feb 15, 2020 4:09 am
Delivery Date: 15 Nov 2019

Re: DIY 12v Battery Change

Sun Apr 12, 2020 1:40 am

One of the youtube vids on the subject, uses an additional 12V battery, as already mentioned in replies to this thread.

With no endorsement implied here it is for discussion/criticism.
To be fair it is qualified by the accompanying comments

The Battery Shop

This video covers the basic 12 volt battery replacement procedure for this 2014 Nissan LEAF. Although this video may provide you with the basic procedures, we recommend that you check with the vehicle manufacture's step by step procedures found in service/repair manuals for the vehicle you are working on.

The use of a memory saving procedure will keep the vehicle's computers memory's alive during the battery replacement procedure. Refering to our Memory Saving video will provide you with various memory saving procedures that can be used according to vehicle manufacturer's requirements.

Some late model vehicles must have the 12 volt battery registered with the vehicle's Battery Control Module or Computer after replacement. See these videos on Battery registration and coding for more details on the procedures.

https://www.youtube.com/watch?v=sS3ssRpJYdg
Regards Neil

LeftieBiker
Moderator
Posts: 14898
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 30 Apr 2018
Location: Upstate New York, US

Re: DIY 12v Battery Change

Sun Apr 12, 2020 3:48 am

I've also seen, on older vehicles, little 9 volt batteries used to hold the logic memory.
Scarlet Ember 2018 Leaf SL W/ Pro Pilot
2009 Vectrix VX-1 W/18 Leaf modules, & 3 EZIP E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

lorenfb
Posts: 2427
Joined: Tue Dec 17, 2013 10:53 pm
Delivery Date: 22 Nov 2013
Leaf Number: 416635
Location: SoCal

Re: DIY 12v Battery Change

Sun Apr 12, 2020 8:38 am

LeftieBiker wrote:
Sun Apr 12, 2020 3:48 am
I've also seen, on older vehicles, little 9 volt batteries used to hold the logic memory.
Yes, that, via the cig lighter socket, has been used, but requires power there in key-off mode.
#1 Leaf SL MY 9/13: 76K miles, 47 Ahrs, 5.0 miles/kWh (average), Hx=70, SOH=73, L2 - 100% > 1000, temp < 95F, (DOD) > 20 Ahrs
#2 Leaf SL MY 12/18: 10.3K miles, SOH 109Ahrs/115Ahrs, 5.2 miles/kWh (average), DOD > 20%, temp < 105F

powersurge
Posts: 1742
Joined: Wed Oct 21, 2015 10:24 am
Delivery Date: 06 Dec 2014
Location: Long Island, NY

Re: DIY 12v Battery Change

Mon Apr 13, 2020 10:38 am

That video was recommended by Nissan for its mechanics so people do not complain that they lost the presets on their radios and other "custom settings". It has nothing to do with correct mechanics or safety.....

It is really not necessary. I like changing around my radio stations after I change a battery.

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