Leisure battery and car battery in parallel?

Damian · Sep 1, 2016

If you wish to reproduce the article as a stand alone item then that would be allowed.
As it is, the web link did not take one to the article and a user had to trawl through the site to locate the article, along with services the company provided etc.

JTQ · Sep 1, 2016

Damian-Moderator said:
If you wish to reproduce the article as a stand alone item then that would be allowed.
As it is, the web link did not take one to the article and a user had to trawl through the site to locate the article, along with services the company provided etc.

If it did not take you to the link I inserted which was specifically
http://www. xxxxxxx.co.uk/battery-technology.php,
then the forum's server or your own browser must have corrupted the provided link by dropping the suffix used.

I provided the link directly to their page on "Battery Technology"; admittedly from there you can search the other topics they discuss, but the one directly dealing with the subject here was the one I linked.

ProfJohnL · Sep 1, 2016

Damian-Moderator said:
If you wish to reproduce the article as a stand alone item then that would be allowed.
As it is, the web link did not take one to the article and a user had to trawl through the site to locate the article, along with services the company provided etc.

As with JTQ's latest comment, the link I provided took you straight to the page that discussed the option of leisure battery verses cranking batteries.

I'm sorry Damian, Moderators are human too, and on this one I think you were heavy handed.

Dwarfer · Sep 4, 2016

From what I know about batteries, fitting more batteries in parralel will always increase the life of all batteries involved regardless of how they as connected or if they are matched or not. Gell and most agm batteries can be installed inside the living area of the van as they do not gas in the same way as normal wet batteries. Maintenance free and vented batteries which have a facility to connect a vented hose to the battery can be installed either inside the living area in a battery box or outside I'm a battery compartment but should be vented to the outside air with a small hose ( my battery compartment on my 1993 elddis has a vent to connect a hose from the battery to the outside but the hose has long gone) open vented batteries should only be in a battery compartment with very good ventilation.

It looks to me like a lot of leasure batteries on sale now they seem to more like starter batteries from about 30 years ago than actual deep cycle batteries. Starter batteries have got thinner and thinner plates over the years to achieve higher starting currents from the same size battery and so called deep cycle batteries are getting thinner plates as well probably more down to the cost of the lead but this will undoubtedly reduce the batteries durability to deep discharge. If you see a leisure battery which is advertised as being dual purpose as a starting battery or quotes high starting amps you don't get something for nothing and the only way to get high starting amps is throug more surface area which means either thinner plates or a phisicly very large battery.
( thinner plates do not surviive deep discharge but do give high starting amps, thick plates survive deep discharge much better but do not give high amps).

ProfJohnL · Sep 4, 2016

Hello Dwafer,

Based on the principle that for a current to flow in a conductor, there has to be a potential difference, then regardless of battery type or capacity, if two batteries have the same terminal voltage and they are connected in parallel, then no current will flow between them. So that fine. The problem arises if the batteries discharge or charge profiles differ ( for example even two batteries of the same make and model, but of different ages or state of charge) there can be some very high charge balancing currents created. Its these sorts of event that could overload cables and cause damage. Its generally accepted that allowing such currents to arise is a bad idea.

The thread was exploring new battery constructions which blurred the differences between cranking and leisure batteries. If the manufacturers claims are correct then another option for caravanners is to opt for one of these new technologies.

20170602yuanyuan · Jun 2, 2017

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Leisure battery and car battery in parallel?

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