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Thread: Flat battery. Please start engine.

  1. 23rd October 2018, 03:52 PM #1
    SteveL Guest

    Flat battery. Please start engine.

    Or similar message on the screen.
    My much loved 2010 D4 diesel HSE is a wonderful car.
    Using this resource I managed to eke out another few months out of my nearly 3 year old battery.
    Its gone, dead and will not accept a charge.
    I had a new Delkor fitted today. Started up after I managed to get the fob to mate with the ignition button, perfect. Thank you Google.
    Went for a drive to do a few jobs, stopped and within minutes the flat battery message came up again. Bugger.
    Started though, no problems.
    Speared around to a beaut mechanic who cleared out a few error messages and tested the battery with his very expensive magic thing.
    Perfect.
    went home.
    Message came up again when I garaged and it still shuts down everything.
    Now, it's not the key fob as that's a new battery..
    It can't be the cranking battery as that's new today. I don't have an aux battery.
    It can't be the alternator as even a dud one couldn't discharge a full battery in an hour or so in daylight.
    The Car locks, I've reset the windows, radio and clocks, all appears honky dory.
    I really notice the new battery and how much easier it starts (780 cca vs 900cca). Just that warning!
    Any ideas anyone?
    Regards
    Steve L.
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  2. 23rd October 2018, 04:31 PM #2
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    loanrangie
    loanrangie is offline LordRover Subscriber
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    Was the output of the alternator tested ? , they can kill a new battery quick smart when they go.
    MY08 TDV6 SE D3- permagrin ooh yeah
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  3. 23rd October 2018, 04:48 PM #3
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    rangieman
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    Quote Originally Posted by loanrangie View Post
    Was the output of the alternator tested ? , they can kill a new battery quick smart when they go.
    X2
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  4. 23rd October 2018, 05:28 PM #4
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    drivesafe
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    Hi Steve and unfortunately a number of Land Rovers models, including yours, have a design fault where the alternators can flatten a cranking battery in as little as 4 minutes.


    I found this out the hard way with my RR, and it has a larger battery than yours.


    BUT, from what you have posted up, I would rule that problem out at this time.


    You say you had the new battery fitted and then did some running around.


    A new battery does not come fully charged and if you were doing lots of short drives, there is a good chance you are actually discharging battery during every start and not driving long enough to recharge the battery again.


    If you have a battery charger, or can borrow one, try giving your cranking battery a good overnight charge.

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  5. 23rd October 2018, 07:45 PM #5
    rocket rod
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    When I replaced my battery recently, the RAC guy did a battery reset routine on his fancy gadget. I also looked up the function on my GAP tool and did a battery reset there as well. Could it be that the on board BMS still thinks the battery is flat if you haven't reset it? Just a thought.
    Rod

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  6. 23rd October 2018, 08:38 PM #6
    DiscoJeffster
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    Hey Rocket. Not at all. The BMS is important to have reset but won’t have such a dramatic effect.
    As has been said when the alternator fails its essentially a short to ground and will destroy a brand new battery if not identified.
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  7. 26th October 2018, 12:17 PM #7
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    Cannon
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    What Vehicle Battery Voltage would one see via Live Values on the GAPiiD tool when driving?
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  8. 26th October 2018, 01:38 PM #8
    DiscoJeffster
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    Flat battery. Please start engine.

    Quote Originally Posted by Cannon View Post
    What Vehicle Battery Voltage would one see via Live Values on the GAPiiD tool when driving?
    Completely variable. The BMS ensures it only charges when needed and on overrun etc. varies from 12v - 14.7v throughout the trip.
    2010 TDV6 3.0L Discovery 4 HSE
    2007 Audi RS4 (B7)
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