If I have the car doors open for a while or tinker with the stereo (engine off) it only takes a few minutes for the warning on the dash saying "Low Battery Please start engine"

And on the centre screen it says "low power, shutting down"

If I use the @753 hack' and access vehicle signals I can see that at rest the battery voltage starts at 11.9V and when it drops to 11.7 I get these warnings. I reckon its less than 4 minutes.

When the engine is started it charges at 14.2V.

Can someone do the same and see what the battery is registering at rest please? Should it be over 12V?

Should it shut down systems so quickly? It means I can't sit in the car without the engine running, even just listening to the radio with no lights or heating/air con etc. Seems daft. Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top

*Gone:L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

Just been out and tried mine which hasn't run since mid day yesterday. At rest it is showing battery volts at 11.9 / 12 volts and when I start the engine it charges at 14.5 volts. From past experience when using the radio with the engine off it doesn't take very long to get the low voltage message, I believe it is a Range Rover " feature " . Agueroooooooooo. 93-20
I swear you will never see anything like this ever again....watch it..drink it in.

Do you love your car so much you sit inside it and listen to the radio?

If I happen to be waiting for SWMBO coming out of the hairdresser or suchlike, then yes. Agueroooooooooo. 93-20
I swear you will never see anything like this ever again....watch it..drink it in.

I would think it may be a slight duff battery. Ideally when fully charged they should be sat around the 13.2V mark although the cottage does not provide a very accurate indication of the state of charge.

I've been able to have mine sat playing music through the stereo for a couple of hours (could be viewed as an expensive upgrade in someone's iPod speakers they had)

[edit] of course with all the FF's electrickery if could be drawing enough when off to drop the terminal voltage, best way would be to see what the level is when it's open circuit (ie everything disconnected) [/edit]

Thanks for the replies.

Does anyone know at what voltage the car will not be able to turn over?

I know my Defender sits for long periods unused and the battery drops to 10.5V and won't start and needs a trickle charge again. Discovery 4 HSE
1998 110 TUM HS FFR Hard Top XD WOLF
1982 Series 3 Hard Top

*Gone:L462 D5 HSE LUX, L663 Defender 110 HSE, Discovery 3 HSE, 2014MY Range Rover Sport 5.0 Supercharged AB Dynamic; L405 Exec Vogue SE 4.4, 5.0 Supercharged Autobiography, Defender TDCi XS CSW, Defender TD5 HT, Vogue SE TDV8, Vogue TD6, RRSport SC 4.2V8, Classic 3.9 Vogue Auto, Land Rover Series 3 SWB

In my experience with large industrial diesels with 24 v systems (2x12v) , then each battery would have to be at least 12.5v to give a reasonable chance of turning an engine sufficiently to start it depending of course whether it was a cold engine or already been run etc. I think the screen voltage shown on the Range Rover is somewhat misleading as when entering the 753 mode on the screen then other things are already running in the background thus bringing the recorded voltage down. I suspect if you isolated the battery from all systems and then take a reading across the terminals then with a healthy battery a reading of 12.5vdc or even higher would be obtained, probably nearer to 13vdc. Agueroooooooooo. 93-20
I swear you will never see anything like this ever again....watch it..drink it in.

Hi rr 2010 is a bit new for a dodgy battery issue but we are talking about a range rover after all. Lol it is four years since new. The electronic load on the battery may have been so excessive that the "quality parts Land Rover use on such expensive cars that mostly footballers and CEO buy they don't give a ****) I would go and have the battery tested at a good garage you know and trust NOT a main dealer. A good replacement will cost you £120-160. You could try first disconnecting the battery for a while, can't remember the sequence for such a new car so search the forums.
Hope it helps
George Traded in my Audi TT 225 for my Range Rover TD6 Autobiography in Java Black. Range Rover now sold.