DaveinOlyWA
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Joined: Sat Apr 24, 2010 7:43 pm
Delivery Date: 10 Nov 2016
Leaf Number: 314199
Location: Olympia, WA
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Re: Replaced 12v Lead with 12v Lithium

Sat Mar 30, 2013 12:40 pm

TomT wrote:Interesting since I've left mine for weeks at a time (unplugged) and never had an issue. When I had my two year battery report last month they also tested the 12 volt battery and it got the highest possible marks... Go figure.

DaveinOlyWA wrote:i found that the only real risk is if leaving the car sit for extended periods of time. cold weather aggravates any lead acid batt so outside does compound it. there was one WA guy who parked his outside for 3½ days while at the ocean and temps were a bit colder than normal with lows in upper 20's, low 30's and his battery was completely dead. I think he said he measured his at like 7 volts. he jumped it and has had no lasting issues but he puts a lot of miles on his LEAF but also takes several trips a month. he has left his car sit for similar lengths several times without issue but thinking its simply mismanagement catching up.


like any battery chemistry, lead is affected by temperatures. it has to get pretty hot to make any significant difference but on the cold end, that is very reachable by most of the country including the relatively mild weather we get in the Pac NW
2011 SL; 44,598 miles. 2013 S; 44,840 miles. 2016 S30; 8341 miles. 363 GIDs, Ahr 82.34, Hx; 100% kwh 28.1
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Stanton
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Joined: Thu Feb 03, 2011 10:56 am
Delivery Date: 01 Sep 2011
Leaf Number: 7458
Location: Plano, TX
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Re: Replaced 12v Lead with 12v Lithium

Sat Mar 30, 2013 1:24 pm

KJD wrote:What is the amp hour rating of the new battery compared to the amp hour rating of the old battery ?


The Lithium battery is sized at HALF the AHr rating as the "stock" 12v battery that ships with the Leaf which puts it at around 20-22 AHrs. Remember, you really can't access anything below 50% in a lead acid, but (as we all know) you can theoretically access between 80-90% of the Lithium if necessary (protected by built-in BMS). My guess is you could run the radio (or lights, etc.) longer with this SMALLER Lithium battery than with the lead acid it replaced, but I'm not going to try it 8-)

I might take a voltage reading once-in-awhile, but I don't think I'm up for regular readings/monitoring. This battery typically sits between 12v-13v.
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

Solangelist
Posts: 13
Joined: Sun Jun 03, 2012 9:13 am
Delivery Date: 26 Apr 2012
Leaf Number: 123456

Re: Replaced 12v Lead with 12v Lithium

Sat Mar 30, 2013 3:17 pm

Is there a built in charger in the new lithium battery pack to accept the old lead acid battery charging profile? Or did you have to modify the original lead acid charging system for the new lithium?

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Stanton
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Re: Replaced 12v Lead with 12v Lithium

Sat Mar 30, 2013 4:02 pm

Solangelist wrote:Is there a built in charger in the new lithium battery pack to accept the old lead acid battery charging profile? Or did you have to modify the original lead acid charging system for the new lithium?


All of these "drop in" lead acid replacement batteries are engineered to accept the ICE charging profile, otherwise it would be too complicated for the average person to use. The difference between the good (read: expensive) and bad (read: cheap) Lithium replacements is usually built-in cell balancing and/or voltage min/max monitoring. The irony is the Leaf charging profile (very stable--and well controlled--DC charging) and maintenance "top off" checks every 5 days (with the ability to "quick charge") is ideally suited for a 12v Lithium starter battery, but they're just too expensive to put in every car.
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

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TonyWilliams
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Location: San Diego
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Re: Replaced 12v Lead with 12v Lithium

Sun Mar 31, 2013 1:05 am

For the record, the Rav4 EV Gen II has the same 12 volt issues. I've parked mine for 3 weeks, and left it on a 12 volt tender.

I also left the main traction battery unplugged as an experiment. That experiment didn't start out well when I left the daily morning heater timer on.

Fortunately, I could remotely turn it off.

derkraut
Posts: 1477
Joined: Fri Jul 16, 2010 7:39 pm
Delivery Date: 14 Jun 2011
Leaf Number: 004248
Location: San Diego vicinity

Re: Replaced 12v Lead with 12v Lithium

Sun Mar 31, 2013 3:43 am

My 2011 Leaf has been stored in my garage, unplugged, with the main traction battery @ 3 bars, for over 30 days now. When I get home next week, I expect to be able to jump in, power up, and drive off.

This is the longest I've ever gone without driving it. So...we'll see.
Derkraut
Color: Cayenne SLE, ETEC trim
reserved: 5/15/2010
Leaf del. 6/14/2011
Updated on 3/20/2017, 9 bars @34.5K+mi. 100% charge: Bat temp 72.5F, Gids=189, S=95.50, C=44.62, H=46.68 Traction bat=392.0V, 12V battery =12.0V

derkraut
Posts: 1477
Joined: Fri Jul 16, 2010 7:39 pm
Delivery Date: 14 Jun 2011
Leaf Number: 004248
Location: San Diego vicinity

Re: Replaced 12v Lead with 12v Lithium

Sat Jan 18, 2014 3:38 pm

Late follow up report......It powered up with no problem whatsoever.
Derkraut
Color: Cayenne SLE, ETEC trim
reserved: 5/15/2010
Leaf del. 6/14/2011
Updated on 3/20/2017, 9 bars @34.5K+mi. 100% charge: Bat temp 72.5F, Gids=189, S=95.50, C=44.62, H=46.68 Traction bat=392.0V, 12V battery =12.0V

Durandal
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Joined: Wed Sep 21, 2016 8:55 am
Delivery Date: 22 Sep 2016
Leaf Number: 025018
Location: Central Arkansas

Re: Replaced 12v Lead with 12v Lithium

Wed Jan 11, 2017 9:58 am

I intend on doing this when my 12v lead acid battery dies, then I'll pull the trigger on getting a Lithium 12v battery.
Pulled the trigger on going EV on 10/2016 with a 2012 Leaf, and a Tesla Model 3 reservation expected to receive in late 2018.

VitaminJ
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Leaf Number: 415775
Location: Morrison, CO
Contact: YouTube

Re: Replaced 12v Lead with 12v Lithium

Wed Jan 11, 2017 11:24 am

Ok, so this thread is almost 4 years old. The batteries being posted about then were way too heavy and way too expensive. There is no need for a large AGM or lithium battery designed to start an ICE car.

What we need is an exceptionally lightweight battery like this motorcycle battery:
https://www.batterystuff.com/powersport ... tTechSpecs

2lbs, $145. That's more like it.
2013 Ocean Blue SV w/ QC and LED

PM me about converting your 120v EVSE to 240v

BillHolz
Posts: 60
Joined: Tue Sep 27, 2016 6:32 am
Delivery Date: 07 May 2016
Leaf Number: 322345
Location: Norfolk, VA

Re: Replaced 12v Lead with 12v Lithium

Wed Jan 11, 2017 11:59 am

Yes, any 4 series LiFePO4 battery is likely to do the job. I would even consider an RC pack such as: https://hobbyking.com/en_us/zippy-fligh ... -pack.html which would require adapters to connect to the car top post connections. The motorcycle version is probably easier to adapt to the car.
2015 SV no QC

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