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Home > Maintenance & Mods (L405) > Auxiliary battery state of health

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Killiestu

Member Since: 23 Jan 2023
Location: Kilmarnock
Posts: 21

2013 Range Rover Autobiography TDV6 Corris Grey

Auxiliary battery state of health

Click image to enlarge

Morning all,

Quick bit of advice required...
My start stop has stopped working recently on my 2013 L405 AB.
I have done a quick health check on the auxiliary battery and this is what it shows.

Do we think it need replacing?

Click image to enlarge

18th Feb 2023 9:57am

oggy

Member Since: 09 Sep 2020
Location: padstow cornwall
Posts: 395

2007 Range Rover Vogue SE 4.2 SC V8 Java Black

i would try putting it on a battery charger conditioner before replacing it might bring it back to a good state new vehicle purchase
2007 supercharged 4.2 java black .sand leather vogue se trim
previous cars .
range rover classic 200 tdi
discovery 1 200 tdi
freelander 2 2008 hse
discovery 1 300 tdi
p38 4.0 ltr man r380 ex royal support vehicle on v5c
discovery td5 man off roader

18th Feb 2023 10:40am

stan
Site Moderator

Member Since: 13 Jul 2010
Location: a moderate moderated moderator moderating moderately in moderation
Posts: 35265

there's an argument that some say the stop/start is a pain..certainly if you want this function then try to charge the battery or replace it.. ... - .- -.

Y. O. L. O.
.

18th Feb 2023 10:57am

MrWold

Member Since: 26 Feb 2022
Location: West Sussex
Posts: 135

2014 Range Rover Autobiography SDV8 Barolo Black

Stop/start on a 2013? I'm confused as I thought it came in later than my MY14 2014 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

18th Feb 2023 12:00pm

Killiestu

Member Since: 23 Jan 2023
Location: Kilmarnock
Posts: 21

So quick update.
I went down to the local euro carparts and spoke to them about testing a good battery.

The little tester I have shows up " good - recharge" but on mine it was " recharge and test" this might be due to something called surface charge and can be a sign of an unstable battery.
Anyway I have bought and fitted the new battery and we're all good.
Start stop is working a treat.

18th Feb 2023 12:37pm

Alistair

Member Since: 11 Feb 2011
Location: Peterborough / Bordeaux / Andorra
Posts: 7923

2013 Range Rover Vogue SE SDV8 Santorini Black

MrWold wrote:
Stop/start on a 2013? I'm confused as I thought it came in later than my MY14 2014

That was my reaction too - maybe it was an option on earlier cars, like TPMS was, then became mandatory later ?

18th Feb 2023 2:34pm

Killiestu

Member Since: 23 Jan 2023
Location: Kilmarnock
Posts: 21

Well I have changed both batteries now and car is all good and start/stop is working 🙂

2nd Mar 2023 4:59pm

Phoenix

Member Since: 16 May 2022
Location: Gone
Posts: 1631

I'd take the measurements above with a very large pinch of salt, however, an internal resistance of 5 mOhms or above is a good indicator of a defective or reduced capacity battery. 17 mOhms suggests to me that the test lead resistance isn't 'zeroed out' as would be the case with a calibrated tester, but also says all is not well with the battery - just not in a quantifiable way.

BTW, DON'T go putting a standard multimeter across a battery to measure internal resistance, at best, you'll get a strange negative reading, at worst, you'll have a one-shot handwarmer....

2nd Mar 2023 6:35pm

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