brotherjethro
Posts: 10
Joined: Mon Jul 03, 2017 6:21 am
Delivery Date: 03 May 2017
Location: Vancouver, WA

12V battery capacity

Tue Aug 15, 2017 6:14 pm

Hi all,

Long time lurker, first post...

I've read a lot of threads which mention the supposed low capacity of the 12V battery. These threads cover a wide variety of topics, but seem to center on the idea that the 12V battery in the leaf is not meant for handling "normal" ICE car duties, such as starting an engine, etc.

I'm confused by this: The battery in my 2013 Leaf is a "51R" style lead acid battery, which is used in thousands (millions?) of ICE cars on the road today. As examples, my wife's 2017 Honda CR-V, and our older 2000 Honda CR-V both have an identical battery.

The battery in my 2013 Leaf advertises 500CCA on side, and I don't doubt it, as I have jump started many cars from our older CR-V.

What is the source of this idea that the 12V battery in the Leaf is so weak that it must be treated with special care? Is it the poor battery management firmware in the Leaf, which basically only charges at 13V?

As far as I can tell, the battery is perfectly normal, if a little small, and the only issue is that one needs to charge it manually occasionally to keep it topped off.
2013 Pearl White SV, bought used in 2017 with only 5100 miles. Vancouver, WA.

LeftieBiker
Posts: 6934
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12V battery capacity

Tue Aug 15, 2017 8:33 pm

You have misunderstood what you've read. The Leaf does indeed have a standard starting battery. The problems are, first and mainly, that the car doesn't always maintain the charge properly (especially with the 2013 leaf) and second, that a starting type battery isn't really appropriate for this kind of application - a deep cycle battery would be better. There were also quite a few defective batteries in the 2013 cars, from what I've read.

This really should have been posted in one of the existing topics. Maybe a Mod will move the thread there.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

brotherjethro
Posts: 10
Joined: Mon Jul 03, 2017 6:21 am
Delivery Date: 03 May 2017
Location: Vancouver, WA

Re: 12V battery capacity

Tue Aug 15, 2017 9:22 pm

Okay, thanks for that. So if it's just a matter of battery management, I understand that. It does seem to be quite poor, but at least it can be supplemented manually.
2013 Pearl White SV, bought used in 2017 with only 5100 miles. Vancouver, WA.

LeftieBiker
Posts: 6934
Joined: Wed May 22, 2013 3:17 am
Delivery Date: 31 May 2013
Location: Upstate New York, US

Re: 12V battery capacity

Tue Aug 15, 2017 9:41 pm

brotherjethro wrote:Okay, thanks for that. So if it's just a matter of battery management, I understand that. It does seem to be quite poor, but at least it can be supplemented manually.


Yes, although after doing that for three years and change, I can say with authority that it gets Old.
2013 "Brilliant Silver" SV with Premium Package and no QC, and 2009 Vectrix VX-1 with 18 Leaf cells.

The most offensive, tasteless phrase in use here is "Pulled the trigger." I no longer respond to posts that use it.

Evoforce
Posts: 634
Joined: Wed Mar 04, 2015 9:58 pm
Delivery Date: 28 Feb 2015
Location: Fountain Hills Arizona

Re: 12V battery capacity

Tue Aug 15, 2017 11:10 pm

And then there are some of us who have never had replacement batteries or put maintainers on them. I myself have (2) 2011 Leafs that still have original batteries in them. However, both are SL and have solar supplement.
*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

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