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Battery voltage
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Shadow71
 


Member Since: 19 May 2019
Location: Stoke on trent
Posts: 45

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4
Battery voltage

Hey all. I am looking for thoughts on this one. With the gap tool in and on live values. Before starting the battery was at 12.4V, just before starting it drops to 9.5V and on running it goes up to 14.5V. I know the agm batteries charge at a higher rate but should it drop that low? The battery is about 3 years old now so could it be on its last legs.

I took it off a while back and put it on the smart charger which said the capacity had dropped to about 60%.

Any thoughts only good ones though please.  
Post #236658014th Apr 2024 10:23 pm
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itsaguything
 


Member Since: 20 Dec 2023
Location: Manotick, On
Posts: 151

Canada 2015 LR4 3.0 SCV6 HSE Lux Auto Aintree GreenLR4

Simple. An at 60% of capacity battery… is done.
A fully charged battery (AGM) is at least 12.6 v.
Moreover the 14.5v you read is not the battery reading but the charging from the generator reading.

Cheers. 2015 LR4 HSE Lux Aintree Green
2013 LR2 HSE Radiance Red
2007 XKR Jaguar Racing Green
2005 XJR Jaguar Racing Green
2002 S-Type R British Racing Green  
Post #236658815th Apr 2024 12:47 am
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Shadow71
 


Member Since: 19 May 2019
Location: Stoke on trent
Posts: 45

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Hi. That’s good but what about the 9.5V  
Post #236663215th Apr 2024 5:05 pm
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jenseneverest
 


Member Since: 12 Jun 2017
Location: somewhere
Posts: 769

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Manual Zambezi SilverDiscovery 3

replace the battery.  
Post #236663515th Apr 2024 5:34 pm
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Gary_P
 


Member Since: 03 May 2016
Location: Kent
Posts: 1527

Ukraine 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

Voltage always drops when starting the car. From memory it should be around 10.5v, so 9.5v does sound low. Gary
-------------------------------------------

Discovery 4 HSE 2016MY  
Post #236663815th Apr 2024 6:17 pm
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Shadow71
 


Member Since: 19 May 2019
Location: Stoke on trent
Posts: 45

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Thanks all. Not the answer I wanted but probably what I expected. It could maybe explain the lack of the start stop also then maybe  
Post #236664715th Apr 2024 9:01 pm
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Gary_P
 


Member Since: 03 May 2016
Location: Kent
Posts: 1527

Ukraine 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

That's the give away ...... Gary
-------------------------------------------

Discovery 4 HSE 2016MY  
Post #236666116th Apr 2024 12:03 am
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Shadow71
 


Member Since: 19 May 2019
Location: Stoke on trent
Posts: 45

United Kingdom 2016 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Cheers guys. You told me what I didn’t want to know. Still probably cheaper than some problems it has  
Post #236666616th Apr 2024 6:30 am
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