DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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An interesting concept in preventing a flat battery...don't know what effects it would have on the D3 'brain' though. TFC over to you 
http://www.batterybrain.com/products/index.html 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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 18th Jul 2006 5:17 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
  
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complete waste of dosh...  there is no correlation built in between battery capacity, temperature and voltage - which are the three factors that affect startability*
The Disco 3 has power management built into many systems, disconnecting active systems won't do it any good at all 
(*new word, copyright 10forcash )
That's the end of that one eh?
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| 18th Jul 2006 9:11 pm |
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DG
Site Moderator
Member Since: 12 Dec 2005
Location: The Gaff
Posts: 50934
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I knew you wouldn't let us down TFC 
I am learning that it's best just to put things forward either to be 'ooooo'd & aaarr'd' at ....or ....as in this case, completely tw*ted 21 year LR veteran > D2 GS 2003 > D3 S 2006 > D3 HSE 2009 > D4 HSE 2013 > D4 HSE 2015 > D5 HSE 2018 > DS HSE R-Dynamic P300e 2021
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| 18th Jul 2006 10:51 pm |
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dylansdad
Member Since: 04 Apr 2006
Location: Solihull
Posts: 745
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so doesnt this help in the case where you leave the door open or the car is parked say at the airport for a week and the alarm keeps sounding? or some such mistake? i.e. if detects the battery is getting low and disconnects load from it to preserve whats left to get you going when you return?
as for it being something I want... im not saying that, but I have seen the solar trickle chargers, and with the dealer telling me the car doesnt actually generate enough power when moving to fully recharge the battery ...EVER....sort of worried me into thinking I might get one.
(apparantly they are recommending all D3s batteries should be put on charge when in for any work) 2004 TDV6 HSE Auto Zambezi Silver
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| 18th Jul 2006 10:56 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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In terms of battery charging, the Disco3 can 'hold it's own' under normal operating conditions - i.e. start to stop of over 7 miles..... the LR dealers have to use battery chargers for any work involving software upgrades as WDS / IDS will not function correctly with voltages of less than 12.65VDC - which is above the static voltage of a fully charged lead-calcium battery
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| 18th Jul 2006 11:07 pm |
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dylansdad
Member Since: 04 Apr 2006
Location: Solihull
Posts: 745
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I can see what youre saying, but the dealer (and the LR recovery guy who had to start me 3 different times when having batter issues) both said the same.
They were saying that unlike 'older' vehicle designs the D3 was so loaded with electronics they were seeing lots of low battery issues which is why there is this unofficial policy in place.
They were also specific about the fact that in a situation where the battery had been discharged to the point it couldnt restart the car, no matter how long a drive you did you would not get the battery back up to full without a visit to the dealer to recharge.
I was also given duf info by another LR recovery guy who told me it was ok to jumpstart my car with normal jumpleads something I am now well lectured and educated in avoiding  2004 TDV6 HSE Auto Zambezi Silver
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| 18th Jul 2006 11:15 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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It's true that a lead - calcium battery does not like deep discharge and will only recover with a bench charge, any diesel engined vehicle is difficult to start with jum-leads, the accepted practice is to charge the bettery via the jump leads from the donor vehicle for a minimum of 10 minutes before attempting a start
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| 18th Jul 2006 11:20 pm |
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dylansdad
Member Since: 04 Apr 2006
Location: Solihull
Posts: 745
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thats what I was told by the origional guy, but was seriously warned NEVER to do so by the second (and I have to admit - good) LR guy and then the dealer.
something to do with standard jump leads having no surge protection and a deep discharged battery would not stop your ECU from being fried by the initial surge of connecting the charging vehicle. they claimed that if this happened they would be able to tell via LR diags.
My jump leads were standard ones, Id never even heard of these special jump leads. 2004 TDV6 HSE Auto Zambezi Silver
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| 18th Jul 2006 11:24 pm |
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PSC
Member Since: 01 May 2006
Location: Johannesburg
Posts: 255
  
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There should not be any problem with using "standard" jumper cables to start the D3, just make sure that the donor car's engine is NOT running when you connect the jumper leads.
Most "spikes" are caused by arcing confusing the regulator on the donor cars alternator (which can only occur when the alternator is working).
One could also make sure that the ignition has been off for at least 2 minutes so as to ensure that the ECU has shut down (if you are paranoid )
Obviously the donor vehicle should have a battery that is in good condition.
-- Paul
Last edited by PSC on 19th Jul 2006 10:27 am. Edited 2 times in total
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| 19th Jul 2006 10:22 am |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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Not disputing what you were told.....
However there are several methods of connecting & using jump leads so as not to create a 'surge'
you can either:-
connect with the donor vehicle's engine off, then start up the donor vehicle and allow it's alternator to charge both batteries for ten minutes first with revs @1500 or so, once started, switch off the donor vehicle and switch on lights & heated everything on the started vehicle before disconnecting the jump leads
or
Switch on lights, heated - everything on the donor vehicle, connect leads, switch off the electrical loads and allow to charge then as per above.
The biggest cause of voltage surge is starting the vehicle and applying revs, if it is started and allowed to idle for a couple of minutes, this will prevent any voltage spikes, it's also difficult to interogate a fried ECU, whatever the cause
Do you have any info on these 'special' jump leads - i've not come across them
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| 19th Jul 2006 10:25 am |
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Jamo
Member Since: 18 Jan 2006
Location: Esperance, Western Australia
Posts: 1170
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I flattened my battery sufficently so that the car wouldn't start, by leaving the coolerbox on for two days.
I started the car using a portable battery pack (regulated). The 400km drive home was sufficient to completely recharge the battery. Have a nice day!
2010 Cayenne Diesel with PASM & Off Road Pkg
2005 HSE D3 (Sold)
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| 19th Jul 2006 10:29 am |
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dylansdad
Member Since: 04 Apr 2006
Location: Solihull
Posts: 745
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10forcash wrote:
Do you have any info on these 'special' jump leads - i've not come across them
no specifics other than that they are not available at your normal halfords and they contain surge protection. 2004 TDV6 HSE Auto Zambezi Silver
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| 19th Jul 2006 6:54 pm |
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LRtuning
Member Since: 22 Feb 2005
Location: AUSTRALIA + UK
Posts: 468
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Engine ECU can be programmed as low as 11.4Volts adn that goes for must systems on the car as the contain microprocessors and memory chips that program at 5v  Money talks.Sex sells.Mud sticks.Time flys.  happens.People talk.Impressions last!
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| 19th Jul 2006 7:10 pm |
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10forcash
Member Since: 09 Jun 2005
Location: Ubique
Posts: 16534
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What's the upper limit TC? ISTR it's somewhere in the region of 18.5VDC
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| 19th Jul 2006 7:13 pm |
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LRtuning
Member Since: 22 Feb 2005
Location: AUSTRALIA + UK
Posts: 468
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Usually around the 17-18Volt mark....but try this at home Money talks.Sex sells.Mud sticks.Time flys. happens.People talk.Impressions last!
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| 20th Jul 2006 6:13 am |
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