Bob
Posts: 300
Joined: Fri May 24, 2013 7:13 pm
Delivery Date: 30 May 2013
Location: New Hampshire

Re: Replaced 12v Lead with 12v Lithium

Tue Feb 20, 2018 10:24 am

You're right that heat kills the big battery. (aka LiIon traction battery).
I've never seen data showing that cold kills the small battery (aka lead-acid 12V battery). Heat definitely kills lead-acid batteries. That is well documented.
On ICEs, cold temperature puts heavier demand on lead-acid batteries, so people with ICEs see their cars fail to start in cold weather, but that's for another forum.
Bob

GerryAZ
Gold Member
Posts: 1876
Joined: Mon Nov 22, 2010 6:47 pm
Delivery Date: 12 Jun 2011
Location: Phoenix, AZ

Re: Replaced 12v Lead with 12v Lithium

Tue Feb 20, 2018 7:24 pm

Heat definitely kills 12-volt batteries, but it is not as much of a problem in a LEAF because under hood temperature is much lower than an internal combustion vehicle. Causes of early failure of 12-volt batteries in my climate:
1. High under hood temperrature.
2. High charging voltage.

The LEAF has much lower under hood temperatures than ICE vehicles and charging voltage is slightly lower than some other cars. These two issues translate to longer battery life in a LEAF under my useage/charging conditions.
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

Evoforce
Posts: 832
Joined: Wed Mar 04, 2015 9:58 pm
Delivery Date: 28 Feb 2015
Location: Fountain Hills Arizona

Re: Replaced 12v Lead with 12v Lithium

Tue Feb 20, 2018 11:31 pm

GerryAZ wrote:Heat definitely kills 12-volt batteries, but it is not as much of a problem in a LEAF because under hood temperature is much lower than an internal combustion vehicle. Causes of early failure of 12-volt batteries in my climate:
1. High under hood temperrature.
2. High charging voltage.

The LEAF has much lower under hood temperatures than ICE vehicles and charging voltage is slightly lower than some other cars. These two issues translate to longer battery life in a LEAF under my useage/charging conditions.


+1
*2011 Leaf 1 bought 2/28/15 @ 28,000ish mi 10 bar (8 bars @ 11/25/15 @ 37,453 ) (New lizard @ 39,275 mi @ 1/20/2016) Now 52,166 mi.
*Tesla Model S 61,000 mi
*2011 Leaf 2 bought 4/28/15 @ 24,000ish mi 12 bar (new lizard Dec. 2014 @ 22,273 mi) Now 35,485 mi

User avatar
keydiver
Posts: 1080
Joined: Mon Sep 05, 2011 1:04 pm
Delivery Date: 08 Dec 2011
Leaf Number: 16484
Location: Hobe Sound, Florida
Contact: Website

Re: Replaced 12v Lead with 12v Lithium

Wed Mar 14, 2018 6:47 pm

No, I'm not confused. Heat speeds up the chemical reaction in all batteries. Everytime i have had a 12 volt battery go bad here in south Florida, the mechanics say the same thing: "the Florida heat cooks batteries. You can't get more than 3 years out of them" .
I've actually had better luck than that, usually 4+ years. The Leaf battery was especially impressive considering how it got bricked a few times by their bad charging scheme, and it still came back to life again. My Galant VR-4's were the worst, because of the underhood heat.
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