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Battery voltage
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bembo449
 


Member Since: 14 Jan 2020
Location: Gainsborough
Posts: 256
Battery voltage

my multi meter says my battery is 12.3v at rest and 14.4v with car running , which i would say is fine but when iid is plugged in the car says its only 12.1v ??  
Post #21790169th Oct 2020 9:16 am
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

The difference between the IId and your multi meter are probably just due to tolerance in the measuring devices.

However, 12.1V or even 12.3V is a partially discharged battery. A battery can show 12V when totally discharged.

It would be good to put that on charge for a day, and see if it recovers. You really want to see 12.7/12.8V after it's been charged. Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone  
Post #21790259th Oct 2020 9:34 am
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Lee Trinder
 


Member Since: 12 Aug 2018
Location: Henley in arden
Posts: 515

2007 Discovery 3 TDV6 HSE Auto Stornoway GreyDiscovery 3

Hi, the battery in mine shows the same values as that and has always been fine, not showing any faults. Once when the I’d tool was plugged in it showed 11.9v but started and ran fine.
Do some of these cars struggle more than others?  
Post #21791219th Oct 2020 8:05 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

My IID often shows 12.1 and sometimes as low as 11.9.
Been like that for well over 5 years, and at least two possibly three different batteries.

Car is battery hungry with ign on and engine off.

Running voltage is mid 14 to 15.2 volts pretty much all the time, due to short commutes.  
Post #217921210th Oct 2020 11:27 am
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