Home > Technical (L405) > Parasitic Battery Drain |
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Max94L405 Member Since: 27 Jan 2023 Location: Hampshire Posts: 41 |
Any update to this?
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11th Mar 2023 1:28pm |
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Gremlin500 Member Since: 11 Mar 2022 Location: Newcastle, UK Posts: 1421 |
Just a thought: if the aux battery is knackered, could it cause a drain on the main battery, perhaps?
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11th Mar 2023 2:47pm |
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MrWold Member Since: 26 Feb 2022 Location: West Sussex Posts: 135 |
Mine has just gone 9 days without being used from 12.8V down to 12.2V today. Was going to starting checking the fuseboxes but engine bay doesn't look easy and I already know how difficult the glovebox one is, so instead: Removed my aftermarket footwell and door LEDs and was about to check the drain when asleep, the car not me, but managed to lose a connection, so perhaps I was asleep as well, and ended up with battery disconnected and rear hatch locked. All sorted now and charging so will re-try that tomorrow. Plan to check the two rear fuseboxes at some point. Would be useful to know how long other people get if car isn't used. Chris 2014 FFRR 4.4 SDV8 Autobiography Barolo Black 2012 RRS SDV6 HSE Baltic Blue and before I saw the light: 2011 Suzuki Grand Vitara SZ5 1998 Ford Mondeo V6 Ghia X 1990 Citroen BX GTi 1973 Triumph GT6 |
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11th Mar 2023 4:04pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
I see nothing wrong with those voltages given the low ambient temperatures and the time scale, how are you measuring the 80mA? is that an average, peak or constant? |
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11th Mar 2023 6:19pm |
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MrWold Member Since: 26 Feb 2022 Location: West Sussex Posts: 135 |
Thanks for the advice on what to expect. So 9 days for 12.8 to 12.2 is acceptable? The problem is I don't know what I should expect hence my initial post.
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11th Mar 2023 6:43pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
The display on what?
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11th Mar 2023 7:11pm |
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MrWold Member Since: 26 Feb 2022 Location: West Sussex Posts: 135 |
I use a cheap multimeter connected inline between the battery negative post and the clamp. I realise it isn't going to be that accurate but there is a lot of difference between the workshop manual <20mA and my readings of 70-90mA hence my belief that I have more drain than I should have.
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11th Mar 2023 8:52pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
Any vehicle should be capable of being parked up, undisturbed for two weeks - as long as the starter battery is >80% charged to begin with. Not specific to JLR but we get a lot of issues with people 'checking in' with their vehicle - some sort of automotive separation anxiety I think. This causes the Telematics to wake up all the body modules and of course the gateway, this only lasts for ~30 mins before the current drain is back to expected levels but when this happens 3 or 4 times a day whilst the driver is on hols, it can cause a non-start condition, even though the battery is healthy.
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11th Mar 2023 9:34pm |
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Gremlin500 Member Since: 11 Mar 2022 Location: Newcastle, UK Posts: 1421 |
@Phoenix:
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11th Mar 2023 10:53pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
There is a lot of usage data that is recorded by the vehicle, I don't have any to hand but I'll add some anonymised screenshots to give an idea of parameters that are monitored by the vehicle systems - typically the concern is 'autostop not working' - actually, it is - it's preventing the engine from stopping due to low battery SoC, therefore it is working as intended, sometimes a difficult one to get across.... |
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11th Mar 2023 11:07pm |
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MrWold Member Since: 26 Feb 2022 Location: West Sussex Posts: 135 |
Thanks for your comphrehensive reply which is somewhat reassuring although I'm not sure that mine would last two weeks given that these have AGM batteries which I don't want to damage and that I'm almost down to 12V after 9 days. Batteries are cheap in the grand scheme of RR ownership but i see no reason to squander them unnecessarily.
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11th Mar 2023 11:10pm |
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Phoenix Member Since: 16 May 2022 Location: Gone Posts: 1631 |
Have a look at this, https://learnmetrics.com/agm-battery-volta...y-voltage/ it's not 100% correct but it's near enough - for a start, 13VDC is effectively 'surface charge' you'll never see that in reality - except in a very few minutes after switching the engine off. 11.8VDC will start the engine, even 11.0VDC 'might', dependent upon temperature. They also state that 10.5VDC is 0% charge, well, it does mean there's 0% above minimum voltage, but it's definitely not 0% charge.
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11th Mar 2023 11:41pm |
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MrWold Member Since: 26 Feb 2022 Location: West Sussex Posts: 135 |
Never had a problem starting even on my previous battery with almost permanent low battery warning because the auxillary battery is called on to help starting if necessary (this is a non stop/start V8 ).
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12th Mar 2023 8:35am |
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