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Stanton
Posts: 2033
Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
Contact: Website Twitter

Re: 12 Volt Lead Acid Battery Replacement

Mon Jun 20, 2016 11:07 pm

rawhog wrote:To anyone that has replaced the 12V battery. Did you go through all of the steps the manual calls out? Or, just replace the battery like any conventional car. Pull negative cable first , then positive. Reverse for installing new battery.


If you're talking about the "wait 5 minutes after shut down before disconnecting 12v", then YES. Otherwise, it's just like replacing any other starter battery.
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

BrockWI
Posts: 616
Joined: Fri Mar 28, 2014 6:28 am
Delivery Date: 28 Mar 2014
Leaf Number: 423875
Location: Green Bay, WI.
Contact: Website

Re: 12 Volt Lead Acid Battery Replacement

Mon Jun 20, 2016 11:15 pm

I just swapped my 12v like normal. I admit I didn't realize there was anything specific we were suppose to do with the Leaf. At the same time I had the stock 12v go completely dead so many times I figured it would be no worse than when that happened.
3 kw solar pv - XW6048 - 8 L16's
4 ton GSHP
2003 VW TDI 170k miles - 52 mpg lifetime
evse level 2 - Clipper Creek HSC-40
2013 S model with QC package Mar of 2013
@60k miles - 61.72Ahr - 94 SOH - 95.61 Hx - 268 GID

TimLee
Posts: 2810
Joined: Thu Jan 20, 2011 9:40 am
Delivery Date: 17 May 2011
Leaf Number: 2026
Location: Chattanooga, TN

Re: 12 Volt Lead Acid Battery Replacement

Tue Jun 21, 2016 7:05 am

rawhog wrote:To anyone that has replaced the 12V battery. Did you go through all of the steps the manual calls out? Or, just replace the battery like any conventional car. Pull negative cable first , then positive. Reverse for installing new battery.

Could you elaborate on what the manual calls for on replacement?
I observed the dealer technician replace mine for the second time through the waiting room observation window and I did not observe anything other than standard practice for changing a 12V battery.

Tim Lee
Chattanooga, TN

Man. Date: 03/10/11, VIN # 2026
Delivered 05-17-2011
Blue Ocean, 2011 SL-eTec

jkline
Posts: 102
Joined: Mon May 02, 2016 10:46 am
Delivery Date: 01 May 2016
Location: Eastern, WA

Re: 12 Volt Lead Acid Battery Replacement

Thu Jun 23, 2016 12:58 am

When I replaced mine, I hooked a battery charger up to the battery connections, loosened them, removed old battery, connected new one, removed charger cables and done.

rawhog
Posts: 457
Joined: Fri Apr 23, 2010 2:45 pm
Delivery Date: 11 Apr 2011
Leaf Number: 898
Location: Vacaville, CA

Re: 12 Volt Lead Acid Battery Replacement

Thu Jun 23, 2016 5:57 am

great idea.
Reservation #63E3842D Blue
VIN=868 CA License plate= 99 MPGE
Deliverd 4-5-11 w/ 8 miles on her

rawhog
Posts: 457
Joined: Fri Apr 23, 2010 2:45 pm
Delivery Date: 11 Apr 2011
Leaf Number: 898
Location: Vacaville, CA

Re: 12 Volt Lead Acid Battery Replacement

Thu Jun 23, 2016 5:59 am

TimLee wrote:
rawhog wrote:To anyone that has replaced the 12V battery. Did you go through all of the steps the manual calls out? Or, just replace the battery like any conventional car. Pull negative cable first , then positive. Reverse for installing new battery.

Could you elaborate on what the manual calls for on replacement?
I observed the dealer technician replace mine for the second time through the waiting room observation window and I did not observe anything other than standard practice for changing a 12V battery.

Look at the manual. There are numerous steps that are referenced from the original item of disconnecting the battery. Some steps involve the Nissan service tool.
Reservation #63E3842D Blue
VIN=868 CA License plate= 99 MPGE
Deliverd 4-5-11 w/ 8 miles on her

c4Lvin
Posts: 10
Joined: Wed Jun 18, 2014 11:57 pm
Delivery Date: 19 Jun 2014

Re: 12 Volt Lead Acid Battery Replacement

Thu Jul 21, 2016 3:43 pm

jkline wrote:When I replaced mine, I hooked a battery charger up to the battery connections, loosened them, removed old battery, connected new one, removed charger cables and done.

Would it not be dangerous for the Leaf's electronics to go faulty with a high voltage 14.5 upwards charger going into the terminals? I can imagine it with the battery on since that's where the energy is stored and resistance but directly to the cables is quite risky no? My 2011 Leaf's battery shows about 12V with the car off and 12.9X while the car is on. So I figured it's a good time for me to give it a slow 1A charge via my Radio Control (RC) charger that does Pb batteries. It's taking a good charge seems like as it's topping off now at 14.3-14.4V and put in 6aH into it. Still going at this very minute. Hopefully it can keep and hold it's charge once it's fully done.

bmartin
Posts: 18
Joined: Thu Dec 31, 2015 1:55 pm
Delivery Date: 20 Jun 2015
Leaf Number: 2012

Re: 12 Volt Lead Acid Battery Replacement

Sat Jul 30, 2016 10:23 am

c4Lvin wrote:
jkline wrote:When I replaced mine, I hooked a battery charger up to the battery connections, loosened them, removed old battery, connected new one, removed charger cables and done.

Would it not be dangerous for the Leaf's electronics to go faulty with a high voltage 14.5 upwards charger going into the terminals?



I've seen my Leaf battery go above 14v with Leafspy. I have thought about replacing the stock battery with a li-ion or a lifepo battery, I would build a DIY battery to maximize energy storage. I wouldn't do it for costs, but to improve the quality of the vehicle.

Using a BMS like this, you could create a battery that could be over 2x the capacity of the lead acid battery, with less weight. My Leaf has a solar panel, and I've seen it produce several amps to the battery on a bright day. Realistically the safest would be to go with LifePo cells, 3.2 nominal and 12.8v 4s nominal voltage. This BMS would be ideal. A 3s li-ion bms may work, but that is lower voltages, 12v being max and 11v nominal.

There are also 45-60Ah BMS available but that might be overkill and will cost extra. I've read that you supply current to the BMS, and it will regulate cell charging, including Constant Current charging from lead acid charging methods. This should be safe up to 6 cells in parallel (All in parallel same charge/manufacturer lot). I would look into 15Ah Lifepo Cells, they are 165mm tall, so should fit in an enclosure. But probably not any/many in parallel, there are also 20Ah/30Ah cells available that will fit in the enclosure. I really like what DjDemonD did here.

Quick calculations: you could store 4 in a row (parallel), and 4 in a line (series) in that enclosure, with room for the BMS. Using 16 20Ah cells you could store about 1kwh (16 cells * 20Ah * 3.2v = 1024kwh), or 320Ah. That is almost a 10x increase over the Lead Acid hazard. I run many accessories off of my 12v system so I see many benefits. Though the cost would be almost $500 for all needed parts and cells.
2012 Nissan Leaf SV - Purchased June 2015 with 16.2k miles.
Lost 1st bar 09/2016 at 37.7k miles, 84% SOH
01/01/2017 - 41k miles, 86% SOH, 226 GIDs

Projects:
Happy Leaf Bluetooth ELM app
Carwings Siri Intigration
Leaf Underglow/charging port lights

rwherrick
Posts: 48
Joined: Sat May 14, 2011 6:30 pm
Delivery Date: 03 Mar 2011
Leaf Number: 0445
Location: San Jose, CA

Re: 12 Volt Lead Acid Battery Replacement

Sun Oct 30, 2016 2:58 pm

The people who have proactively replaced their 12V batteries after 4 or 5 years are on the right track. Or at the very least, done a battery test. I got a call from my wife a month ago that she was stranded, and the Leaf wouldn't start, and was acting flakey (abnormal panel displays; every light on, and yellow "EV system warning light" on). We tried "jump starting it", but it only barely helped. I had to get the car towed to the Leaf dealership. As soon as they replaced the 12V battery, everything was back to normal. I guess one of the plates got brittle and "fell" onto another, and shorted a cell. That can happen at this age - the car was about 5.6 years old at the point it happened. But the bad thing is that with a regular ICE car, you notice "slow cranking", and get some warning. With the Leaf, you probably won't get any warning before something like this happens, so just know that getting 5 years from a lead acid battery is doing well, and don't wait too long to replace it. The dealer charged $111 for replacing the 51L type battery.

- Bob

LeftieBiker
Posts: 8385
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12 Volt Lead Acid Battery Replacement

Sun Oct 30, 2016 4:28 pm

Replacing the 12 volt battery every 4 years is generally a good idea, but I and other people with 12 volt system issues experienced problems much sooner. Mine was at just abut 14 months. I still have that same battery, though, and it works fine as long as it gets regular external charges. So just following a timetable for battery replacement will only help those who aren't going to see charging problems.
2013 "Brilliant Silver" SV with Premium and no QC, a 2009 Vectrix VX-1 W/18 Leaf modules, and 3 EZIP E-bicycles.
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.

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