Member Since: 13 Oct 2014
Location: Nottingham
Posts: 1742
Battery technology - Wet vs AGM
Can anyone enlighten me as to which battery technology is better for a particular vehicle.
As far as I have been lead to believe, AGM is superior to traditional wet batteries in modern cars with stop-start technology.
The AGM battery is a 'dry' system, where the electrolyte is held as a gel between the plates in a glass fibre matting type material - hence Advanced Glass Matt. They are used in stop-start vehicles because they have a faster recovery rate. They are also used when orientation is a factor - i.e. they work upside down.
I also understand that overall, the traditional wet battery can withstand longer high-load applications, e.g. extended cranking in cold weather, winch, etc.
If I am correct in my thinking above, I would expect that a wet battery would suit a D3 better than AGM, except where it's used on a lot of short trips, e.g. school run, etc.
Comments please...There are two rules for success,
1. Never tell everything you know.
Member Since: 11 Oct 2009
Location: Bledlow
Posts: 901
I think you answered your own question? Sorry, I don't have much to add but you have everything there that I am aware of -------------------------------------------------------------------
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have a look here
http://en.wikipedia.org/wiki/VRLA_battery#...ass_mat.29
an AGM isn't a dry battery it still has an electrolyte....
I am led to believe the cranking capabilities are the same or better
A stop start vehicle does many restarts...same size or larger engines.
Its one main feature is its ability to take a charge faster...
More costly - but does the job for me on two Land DroversBREXIT - done properly.
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17th Dec 2014 1:23 am
Madrilleno
Member Since: 13 Oct 2014
Location: Nottingham
Posts: 1742
It's 'dry' in the fact that it doesn't have a couple of litres of dilute sulphuric acid slopping about in it. Looking around, the only disadvantage I can find is an alleged shorter life (in some articles).
This makes me question some members' recommendation of wet cell batteries over AGMs.There are two rules for success,
1. Never tell everything you know.
Member Since: 24 Aug 2007
Location: Kent
Posts: 10564
Look at what LR fit as standard now to D4 and other LR products. They do it for a reason not based on cost as a "wet battery" could be sourced cheaper. AGM way to goMY17 D5 1st Edition Namib Orange
MY15 D4 HSE Kaikoura Stone
MY12 D4 HSE Nara Bronze Sold and gone
MY11 D4 HSE Stornaway Grey Sold and gone
D3 S spec Silver Sold and gone
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17th Dec 2014 8:30 am
Madrilleno
Member Since: 13 Oct 2014
Location: Nottingham
Posts: 1742
LR fit Disco 4 with AGM because they are stop/start capable. There may not be a wet battery which will continue to function for a sufficient length of time to make its use economical in the mid to long term, given the cost of warranty repairs and, more importantly for LR, loss of reputation.
The original question posed was to solicit a discussion of whether the additional cost of an AGM battery could be justified on a vehicle without stop/start technology; and whether this was affected by usage type - a point made in the last line of my original post.There are two rules for success,
1. Never tell everything you know.
Land Rover is quite specific about type of batteries and car's settings.
Look for SSM51557 and LTB00469.
They have different charging voltages in report with temperatures.
The car needs to be set (CCF) to provide proper charging voltages because the car knows to charge the battery based on ambient temperature.
Otherwise you will end up with either an undercharged battery or an overcharged battery. Both being destructive for the battery in time.
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17th Dec 2014 10:16 am
Russell
Member Since: 24 Aug 2007
Location: Kent
Posts: 10564
LR were fitting AGM battery to D4 long before stop start technology was available or thought about for D4. You go by LR recommendation or your own judgment, what ever feels right to you.MY17 D5 1st Edition Namib Orange
MY15 D4 HSE Kaikoura Stone
MY12 D4 HSE Nara Bronze Sold and gone
MY11 D4 HSE Stornaway Grey Sold and gone
D3 S spec Silver Sold and gone
Tow bar, full length roof bars, side steps, tow bar storage unit, surround camers.
D4 camera club
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