cmb2020
Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
  
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Hi all
Replacing my battery current is a varta 95ah 850A
Would a 950ah and 950 amp battery sufficient please?
Same size and terminals same way round etc
It’s £100 and brand new from my good friend
Just want to make sure it won’t damage my 05 d3
Tia Disco 3 SE Manual 2005 V6 2.7
Buckley, North Wales
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 23rd Sep 2022 1:02 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
 
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It will be fine.
Length and height are sometimes worth checking
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| 23rd Sep 2022 1:25 pm |
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cmb2020
Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
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Legend cheers Disco 3 SE Manual 2005 V6 2.7
Buckley, North Wales
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| 23rd Sep 2022 1:26 pm |
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cmb2020
Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
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Hi again
I got a new battery installed….
In the secret screen when engine running the voltage flicks 13.5 and 14 volts. Rarely 14.5
Then when ignition off it shows 11-11.5 volts
Would it be safe to say the new battery is faulty or I have pointlessly replaced the battery and it’s more like the alternator please?
Is alternator easy to test with code reader or direct multimeter?
Tia Disco 3 SE Manual 2005 V6 2.7
Buckley, North Wales
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| 29th Sep 2022 10:42 am |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
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Unless you have had difficulty starting it I would say things are ok.
It’s no bad thing to have a new battery on these cars.
Keep the old one in good condition. Off direct concrete
Difficult to test alternators. There is a guide on here somewhere.
Only fit denso brand alternators to these cars.
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| 29th Sep 2022 12:34 pm |
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NJSS
Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 10481
 
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Pete K
Quote:Keep the old one in good condition. Off direct concrete
From:- https://www.mcgill.ca/oss/article/general-...d-concrete :-
Quote:Have you heard the one about batteries discharging when stored on concrete? Apparently, some people have taken to storing 12V batteries on wooden shelves to maximize their life expectancy. Is there a spark of truth to this or is this claim dead in the water?
A bit of research reveals this to be a zombie truth: it used to be that batteries would discharge faster when stored on concrete, but newer technology put the kibosh on this phenomenon. Yet the belief persists.
Sorry Pete 
NJSS
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| 29th Sep 2022 12:51 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
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It was only 14 years ago that they were having this issue.
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| 29th Sep 2022 1:11 pm |
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cmb2020
Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
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Yes trouble starting it it’s doing the exact same as my old battery. Starting up sounds rough and then screen warnings throw up like terrain and epb
Surely a new battery won’t be faulty so I’m thinking it must be something else. Disco 3 SE Manual 2005 V6 2.7
Buckley, North Wales
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| 29th Sep 2022 1:15 pm |
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Flapper
Member Since: 04 Feb 2015
Location: Gloucester
Posts: 329
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I have the same thing and changed the battery turned out to be the starter motor have a read of my thread:-
https://www.disco3.co.uk/forum/fast-d3-turn-200919.html
BG landrovers said it might be the earths but after they changed the starter my starting rpm jumped from 100rpm to 280rpm and it starts so fast.
as a test i put my old battery back on and its starts just as fast so 
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| 29th Sep 2022 1:22 pm |
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cmb2020
Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
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Flapper…
So yours was a starter motor and can you tell me how the starter motor would cause a new battery to run at 13.5v and 11.5v not running please?
Struggle to understand how starter keeps voltage down when it’s not in use? Disco 3 SE Manual 2005 V6 2.7
Buckley, North Wales
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| 29th Sep 2022 2:46 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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How long had the 'new' battery been unused for? What type of battery is ir?
There is nothing wrong with a charge voltage of 13.5VDC the charge strategy is controlled by the ECM, not the alternator regulator.
11.5VDC with the infotainment system on indicates a battery that is not fully charged, possibly because it has been stood, charge it up with the correct charger for the battery type and measure the rest voltage with a meter and the key out of the ignition.
The diagnostic screen is an indication of voltage, not a measurement, it only displays in 0.5V increments which is far too coarse a measurement for charging diagnosis
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| 29th Sep 2022 3:22 pm |
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Flapper
Member Since: 04 Feb 2015
Location: Gloucester
Posts: 329
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Cmb2020
I picked up on what you said about yours starting roughly and causing error codes
This is what mine did after long cranking and not starting my error code was the air bag light came on.
Second try it started never realy looked a the battery voltage just thought the battery was knackered and changed it. Only to find out the starter was fried and turning over very slowly may be drawing loads of amp, which would cain the battery.
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| 29th Sep 2022 5:02 pm |
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Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10360
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As said you should measure with a volt meter.
Usually after starting I would expect 15v
And then to go down to about 14v
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| 29th Sep 2022 5:31 pm |
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Flatlander
Member Since: 20 Jul 2015
Location: Here
Posts: 575
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The actual voltage very much depends upon temperature, assessed state of charge (or actual if a BMS is fitted) time since start and load demand. Anywhere from 12.3VDC to 16.1VDC are acceptable charge voltages - dependent upon the above and a few other calculated parameters. To make sense of the charge output, you need to also be reading the generator PWM duty cycle percentage , some diagnostic tools will expose it, some won't.
A low (12.6VDC, sometimes as low as 12.3VDC) system voltage will protect the battery and reduce emissions, a higher system voltage is needed to charge the starter battery in low temperatures (5deg. C. and lower) due to the 'reluctance' of Lead-Calcium batteries to charge efficiently at low temperatures.
There are different charge parameters for the different types of batteries (AGM, Pb/Ca, EF etc.) and your ECM will have the correct ones for the type of battery originally fitted to your vehicle, this is why it's important to replace like for like or with one that will accept the charge parameters without detriment.
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| 29th Sep 2022 6:25 pm |
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cmb2020
Member Since: 08 Sep 2020
Location: Buckley, North Wales
Posts: 1150
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Thanks to all
I’ve bought a second multimeter (ferrex Aldi brand)
Battery saying 12.6 now been sat few hours
I’ll check again morning before starting up
Then I’m going to tighten starter motor cable bolts as i disconnected it last year and may correspond with timing of the low power mode problem. Not a bad place to start.
Will disconnect anything electrical ive added around the time the problem started
Failing that, I’ll leave the car to go to sleep and do that parasitic drain test (or try anyway)
And then update
Thanks again Disco 3 SE Manual 2005 V6 2.7
Buckley, North Wales
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| 29th Sep 2022 10:37 pm |
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