ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15264
  
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| Low Battery message after Ctek charge. |
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Not really being using the D4 since Covid.
So been keeping it on trickle charge with my ctek7 (on agm mode).
On Monday, I unplugged as mrs ronp was going to use the D4
3 miles down the road when she stopped for diesel, the 'low battery please start engine' message appeared on the dash.
I put it back on the ctek when she got home and went out to analyse it this morning: -
Ctek showed battery fully, so unplugged it.
Went into the car to remove my ctek reminder on the steering wheel and the 'low battery' message came on.
Drove to town and back (6 miles total) and the Stop Start didn't kick in as it normally would.
Back home I've just connected it back up to the ctek and the battery was reading 3/4 charged after 5 min and fully charged after 45min.
My thoughts are a duff battery, but had both batteries replaced last year and only covered around 5k since and been connected to the ctek when not in use.
Could overuse of the ctek kill the battery?
Your thoughts on what's causing this is most appreciated.  ...... always on the road less travelled 🚧
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 9th Dec 2020 11:57 am |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 13020
 
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earth lead.
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| 9th Dec 2020 12:54 pm |
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33Lurcher
Member Since: 29 Jun 2017
Location: Glossop
Posts: 228
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Got a DS now and we have been using CTEX charger every couple of weeks for the last 2 months after low batt warnings .
I thought it was the battery as a week after fully charging the warnings reappeared , took it to dealer last week they said nothing wrong with battery .
They say its the Dash cam draining it , so I have disabled the parked recording function so it only records whilst driving .
Will see how it goes .
Last edited by 33Lurcher on 9th Dec 2020 3:03 pm. Edited 1 time in total
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| 9th Dec 2020 1:01 pm |
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Kilovolt
Member Since: 29 Jun 2015
Location: South Derbyshire
Posts: 1067
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Although I have a single Lead Acid and not an AGM battery on my D4 (no stop-start), it sat connected to a CTEK from the beginning of lockdown and sat there for at least 4 months. It started the first time and a voltmeter reports battery volts good (stationary and running).
I also have a BMW E36 M3 that permanently lives connected to a second CTEK (like 10 months of the year) and it is always in good health. Again, lead-acid.
I am not familiar with the stop-start system - are both batteries AGM? I was just thinking if one was AGM and one was lead-acid, then the CTEK would not how to deal with both (at the same time).
Just a thought, good luck "Track day running - Don't put your foot back on the accelerator until your absolutely sure you don't have to take it off again"
Current Ride: D4 XS Commercial Baltic Blue SDV6 fully loaded with heated everything 
Track Days: BMW E36 M3 Evolution MY 1996 (3.2 Litre 377 BHP sat in 1,250 Kgs of car, with a pro safety cage and some serious braking power)
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| 9th Dec 2020 2:58 pm |
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Gareth
Site Moderator
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26774
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What’s the actual voltage Ron? The car might be saying low battery, when it’s actually not. Mine does similar. It’s never failed to start though.
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| 9th Dec 2020 3:30 pm |
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lespes
Member Since: 17 Sep 2009
Location: Sitting Down
Posts: 2232
 
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Have found before that with an external charge the BMS doesnt seem to take this in to account.
Try a Battery reset, details in Wiki D4 Landmark MY16 Santorini Black THE LAST
D4 HSE MY12 Marmais Teal: Gone. Missed a lot!
Freelander 2 SD HSE MY11 Silver:Thankfully gone.
D4 HSE MY11 Silver: Gone missed !
Range Rover Sport MY06 HSE Buck Blue: Gone missed!
Discovery D2 TD5 Facelift MY Red Gone Missed!
Discovery D2 TD5 Cobalt Blue: Gone Missed!
Discovery D1 Auto Oxford Blue Not missed at all!
Discovery D1 Avalon Blue First LR! missed!
Now demoted to a VW
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| 9th Dec 2020 3:33 pm |
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Gary_P
Member Since: 03 May 2016
Location: Kent
Posts: 1668
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Good point. I seem to remember the Battery Management System requires the battery to be charged with the negative connected to the chassis or earthing point to allow it to register it (sorry for the non engineering based explanation).
Did you charge in the this config or did you connect directly to the battery terminal?
Cheers Gary
-------------------------------------------
Discovery 4 HSE 2016MY
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| 9th Dec 2020 3:51 pm |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10806
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I am aware of the battery reset procedure for the D3, here:- https://www.disco3.co.uk/wiki/Hard_Reset
They contain the words:-
Quote:CAUTION: MY14 vehicles and later with Stop/Start have an additional battery fitted; the implications of this for the hard reset technique are not fully understood.
Hopefully there is something for battery reset procedure for the D4 elsewhere? Failing which is the hard reset technique now fully understood?
NJSS Am I Gammon or Woke ? - I neither know nor care.
2016 Discovery 4 Landmark
2011 Mercedes Benz SL350 (R230)
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel,
none Electric or H2 fuel cell - yet.
There are 10 types of people in this world: Those who understand binary, and those who don’t.
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| 9th Dec 2020 4:14 pm |
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charlietortoise
Member Since: 29 Oct 2011
Location: Staffordshire
Posts: 511
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I get the exact same thing. Charge it up then you get a low charge start engine, I fitted a new battery, reset the count etc and I still get it. I just ignore it now. Discovery 4 3.0 HSE 2010 year. I like it a lot. Now with winch 😂
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| 9th Dec 2020 4:26 pm |
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DrRobH
Member Since: 10 Oct 2015
Location: Hampshire
Posts: 927
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IID has a live reading to show % charge or health or something like that... Visitor from fullfatrr.com
RR Vogue SE 2011 4.4 TDV8
1974 Lightweight
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| 9th Dec 2020 5:42 pm |
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CarlW
Member Since: 07 Aug 2005
Location: Lancashire
Posts: 113
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Have you tried charging the 2nd battery separately with the Ctek? It's not charged from the main battery when the ignition is off so that could be low if it's been standing for a while.
Can't see leaving the Ctek connected to the main battery causing a problem (unless its faulty) I have two Ctek's connected permanently to my motorbike and Disco and they're both on a time switch which comes on for about 90mins per day. My motorbike was bought new in 2000 and is only on its 2nd battery in 20 years. Disco 4 Landmark
Mercedes Benz SLK CDi
BMW 335D Touring
Defender XS SW 2010 - gone
TDV8 2008 RRS - gone
Disco 3 HSE 2005 - gone
BMW R1150GS
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| 9th Dec 2020 8:07 pm |
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ronp
Member Since: 29 Nov 2006
Location: North Yorkshire
Posts: 15264
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Many thanks for all responses.
Doesn't seem as conclusive as I'd hoped.
Don't know the battery voltage, but would suspect it's down (due to stop/start now not operating).
Ctek is wired to + & - battery terminals, but has been for over a year now with no issues.
Now got it booked in to my local garage to investigate.
The D4 has been faultless to date, so hopefully I'll get this sorted.
...... always on the road less travelled 🚧
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| 9th Dec 2020 8:11 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
 
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I have no knowledge of the d4, but wifes car has bat in boot, but you must charge/jump start it using the under bonnet lugs, apprantely this is so the cars bat managment system knows what is going on?
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| 9th Dec 2020 8:17 pm |
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notyalc
Member Since: 07 Mar 2020
Location: Northumberland
Posts: 75
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+ve lead on the pos terminal -ve lead on a chassis ground.
Otherwise the BMS gets confused.
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| 9th Dec 2020 8:25 pm |
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NoDo$h
Member Since: 02 May 2006
Location: Finding new and exciting ways to milk badgers.
Posts: 19689
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Worth chucking a Foxwell BT100 into your tool kit - a very simple battery analyser, for around £30 will tell you the condition of your battery, CCA capability etc. vs the stated capacity and tell you good/charge/replace with the numbers behind it.
I've had batteries with a good voltage but dire capacity following charging before now. You stick a volt meter on it and everything is great, but when it's under load it all starts to crumble. I know it's not considered "kind" to say no these days, but no. Just no, ok? And if it's not ok, still no.
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| 9th Dec 2020 8:45 pm |
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