Member Since: 22 Sep 2010
Location: Notts.
Posts: 8157
AGM battery on a D3?
Is there any reason or disadvantage that I shouldn't fit an AGM battery on a D3 apart from cost?It can when others can't,
It will when others won't,
It goes where others don't.
16th Apr 2016 9:21 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
The alternator voltage is a little high for most AGMs, but if you get one with a voltage spec that suits the D3 then it will serve you well.
Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 16 Oct 2012
Location: Kent
Posts: 494
None that I know of, best upgrade I made, no more "special programs off" warnings during the winter months anymore, much better suited to my needs because I do mainly short journeys and the AGM charges faster.
If you go to your LR dealer and buy a new battery for your D3 they will sell you an AGM.
I bought the Exide start stop AGM from euro car parts.
16th Apr 2016 10:09 pm
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
From memory the Exide AGM has a 14.6v charging limit, with a 15.0v peak emergency (for up to 1 hour) limit. The D3 will push out 15.3v or more in colder weather.Land Rover - Turning Drivers into Mechanics Since 1948
Last edited by Robbie on 16th Apr 2016 10:19 pm. Edited 1 time in total
16th Apr 2016 10:16 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8157
The one I have is a Varta!It can when others can't,
It will when others won't,
It goes where others don't.
16th Apr 2016 10:18 pm
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
Robbie wrote:
From memory the Exide AGM has a 14.6v charging limit, with a 15.0v peak emergency (for up to 1 hour) limit. The D3 will push out 15.3v or more in colder weather.
Ive noticed that with my D3 now showing 14.8 most of the time whereas a few weeks ago it was 15.1 all the time.
17th Apr 2016 3:10 am
Madrilleno
Member Since: 13 Oct 2014
Location: Nottingham
Posts: 1763
I think the conclusion was AGM, as Robbie said, properly specced. I went with wet-cell.
I did this 3 years ago now...
no issues...checking the alternator output who I get the opportunity 14.5 0r 14.6
The battery seems to handle the lifestyle its now serving.
I also fitted a same size battery to the Old Merc I have adoptedBREXIT - done properly.
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17th Apr 2016 8:44 am
Robbie
Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932
The D3 voltage is not fixed, it is dependent on temperature - so it will go above 15v when it is cold...Land Rover - Turning Drivers into Mechanics Since 1948
Member Since: 16 Oct 2012
Location: Kent
Posts: 494
Am I heading for trouble then?
17th Apr 2016 9:28 am
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8157
Good question, what are the consequences likely to be?- goosed alternator, goosed battery or worse! I've checked my alternator output this (slight frost)morning, it peaked at 15.5 volts with a wet cell battery fitted.It can when others can't,
It will when others won't,
It goes where others don't.
17th Apr 2016 10:36 am
parrafin23
Member Since: 04 Dec 2011
Location: Buskeud
Posts: 681
Mine peaks at 15.5v to 15.4v on cold mornings too.
Mr.P
20th Apr 2016 1:25 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8157
As Robbie says that is the problem with fitting an AGM battery on a D3, after doing my home work most AGM battery's have a maximum charge rate of 14.6 volts, the more you go over this rate the more likely the battery will overheat and warp the plates, particularly on a long journey, current is not a concern as they can be recharged in as little as 3 hours.
It would be interesting to know if a D4 alternator could be fitted to a D3 to overcome the problem! So unless you are like me and had an AGM battery gifted to you stick with a conventional wet cell.It can when others can't,
It will when others won't,
It goes where others don't.
20th Apr 2016 9:27 pm
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72934
But on a long journey the alternator output should drop down to low 14s or even 13.something volts?
20th Apr 2016 9:31 pm
M3DPO
Member Since: 22 Sep 2010
Location: Notts.
Posts: 8157
It could do depending on what accessories you have switched on and the state of charge of the battery and time of year. The most useful item could be a cockpit voltmeter.It can when others can't,
It will when others won't,
It goes where others don't.
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