coolfilmaker
Posts: 319
Joined: Mon Jul 18, 2011 6:55 pm
Delivery Date: 29 Jul 2011

12 Volt Lead Acid Battery Replacement

Mon Jul 18, 2011 7:20 pm

I just learned of the horrifying fact that leafs come with lead acid batteries. Does anyone know of an appropriate replacement? I have read of lithium ion replacement batteries for ICE but I'm wondering if anyone knows of one that works well. The thought of reducing my range even one tenth of a mile with a lead weight is nauseating. Thanks

Herm
Posts: 3765
Joined: Sun May 23, 2010 3:08 pm
Delivery Date: 29 Aug 2012
Location: Timbuktu, Mali

Re: 12 Volt Lead Acid Battery Replacement

Mon Jul 18, 2011 8:04 pm

Get yourself a 4 cell LiFePO4 pack, it will outlive you and me together. 30Ah should be plenty.

coolfilmaker
Posts: 319
Joined: Mon Jul 18, 2011 6:55 pm
Delivery Date: 29 Jul 2011

Re: 12 Volt Lead Acid Battery Replacement

Mon Jul 18, 2011 8:15 pm

That's what I was thinking. Any specific recommendations on where to get one?

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EVDRIVER
Posts: 5508
Joined: Sat Apr 24, 2010 7:51 am

Re: 12 Volt Lead Acid Battery Replacement

Mon Jul 18, 2011 8:21 pm

Be sure that you are in compliance with any LEAF sensors like the battery terminal temp sensor and any 12V monitoring, etc. The LEAF has more checks on the battery then a normal car, it's a bit ironic.

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TonyWilliams
Vendor
Posts: 9372
Joined: Sat Feb 19, 2011 1:48 am
Leaf Number: 00000
Location: 100 Mile Club San Diego
Contact: Website

Re: 12 Volt Lead Acid Battery Replacement

Mon Jul 18, 2011 8:29 pm

Herm wrote:Get yourself a 4 cell LiFePO4 pack, it will outlive you and me together. 30Ah should be plenty.



And you can put it anywhere !!!
JAMP JR tm, the low cost 40 amp J1772 charge station
JESLAtm, the premium 40 amp J1772 portable charging solution
JLongtm the J1772 extension cord
JdeMOtm, the CHAdeMO outlet for your electric car
JDaptortm, the J1772 power outlet

www.QuickChargePower.com

RickS
Posts: 162
Joined: Wed Sep 01, 2010 6:04 pm
Delivery Date: 11 Jun 2013
Location: Tempe, AZ

Re: 12 Volt Lead Acid Battery Replacement

Sat Jul 23, 2011 6:53 pm

I am running a 40Ah GBS LFMP pack in my Prius for the aux battery:

http://elitepowersolutions.com/products ... ucts_id=90

It serves a similar purpose, basically boot up the car, act as a 12 volt reservoir, power accessories when the car is in accessory mode and act as an emergency brake booster power supply.

The OEM lead 12 volt has strange 2/3 size automotive posts so you just about have to go get a replacement from Toyota which is in the $150 range on the low end. I ended up not spending too much more for the lithium pack. I am running individual cell balancers for an added level of safety and longevity. The car under charges the pack slightly giving it about 3.5 volts per cell (3.6 is the target charge voltage). The under charge should extend the battery life actually. It's been in there for six months now and is working well. I plan to pull it at about a year and run a capacity test on it to see how it's really holding up.

The only down side is there is no forgiveness for over discharging. If you were to leave an interior light on and it drains the battery to 0 volts the battery is dead, it does not come back. A typical application in an EV has a battery management system which has interlocks to prevent over discharging or over charging.

When the lead battery dies in my Leaf it's being replaced with lithium as well.

*Disclaimer* I work at Elite Power Solutions
leafbatteriescanttaketheheat.com/

Volusiano
Posts: 1461
Joined: Thu Feb 24, 2011 2:41 pm
Delivery Date: 03 Jun 2011
Location: Phoenix, AZ

Re: 12 Volt Lead Acid Battery Replacement

Sat Jul 23, 2011 11:43 pm

If the charging system on the Leaf for the 12V battery (not to be confused with the 3.3Kw charger for the main battery pack) is designed to charge Lead Acid batteries, you can't just swap in a different chemistry type battery and expect that the current charging system is compatible with the new battery type, can you?

That 12V lead-acid battery in the Leaf looks pretty small so it can't be heavy enough to really have an effect on the Leaf's mileage.

What is the price difference between replacing the 12V lead-acid battery with a different type battery anyway? Is it really worth it?

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TonyWilliams
Vendor
Posts: 9372
Joined: Sat Feb 19, 2011 1:48 am
Leaf Number: 00000
Location: 100 Mile Club San Diego
Contact: Website

Re: 12 Volt Lead Acid Battery Replacement

Sat Jul 23, 2011 11:48 pm

Volusiano wrote:
That 12V lead-acid battery in the Leaf looks pretty small so it can't be heavy enough to really have an effect on the Leaf's mileage.

What is the price difference between replacing the 12V lead-acid battery with a different type battery anyway? Is it really worth it?



It doesn't appear to be "worth it" to you. Some of us, myself included, don't want to have 1850's technology lead and acid in their 21st century car.
JAMP JR tm, the low cost 40 amp J1772 charge station
JESLAtm, the premium 40 amp J1772 portable charging solution
JLongtm the J1772 extension cord
JdeMOtm, the CHAdeMO outlet for your electric car
JDaptortm, the J1772 power outlet

www.QuickChargePower.com

User avatar
Nekota
Posts: 615
Joined: Sat Dec 11, 2010 11:16 pm
Delivery Date: 12 May 2011
Leaf Number: 2182
Location: Sunnyvale, CA

Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 5:53 am

TonyWilliams wrote:
Volusiano wrote:
That 12V lead-acid battery in the Leaf looks pretty small so it can't be heavy enough to really have an effect on the Leaf's mileage.

What is the price difference between replacing the 12V lead-acid battery with a different type battery anyway? Is it really worth it?



It doesn't appear to be "worth it" to you. Some of us, myself included, don't want to have 1850's technology lead and acid in their 21st century car.


Hmmm - speaking of old technology those round wheels are pretty ancient technology.. ;)
I'm still keenly awaiting those foldup ones on that modified DeLoren with Mr. Fusion energy pack 8-)

On a more serious point, the charging technology used is important and dropping in a LiCo chemistry battery pack to replace the lead acid could be dangerous. I learned that NiCd batteries explode when charged with constant current compared to flooded lead acid when I was about 10 years old. I was blind for about 2 days after the second NiCd cell exploded as I was disconnecting the charger from the remaining cells in the pack.
Res 20Apr2010 / Ordered 27Sep2010 / Delivered 12May2011

PV System

smkettner
Posts: 6607
Joined: Mon Aug 09, 2010 10:13 pm
Delivery Date: 26 Feb 2014
Location: Orange County, CA

Re: 12 Volt Lead Acid Battery Replacement

Sun Jul 24, 2011 7:43 am

TonyWilliams wrote:It doesn't appear to be "worth it" to you. Some of us, myself included, don't want to have 1850's technology lead and acid in their 21st century car.

Is your battery contructed with a wood box and sealed with tar? Or do you have six glass jars connected in series?

You might consider a modern AGM battery. (still lead/acid)

BTW, does anyone know the group size of the tiny battery? Or what does the little thing actually weigh?
1 bar lost at 21,451 miles, 16 months.
2 bar lost at 35,339 miles, 25 months.
LEAF traded at 45,400 miles for a RAV4-EV

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