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JMC



Member Since: 01 Feb 2009
Location: Aberdeen-Angus
Posts: 786
Scotland 2012 Range Rover Westminster TDV8 Orkney Grey
Full battery voltage....

I've seen a few posts discussing the acceptable voltage on a battery, so decided to test mine this morning.

I've made a lead which goes from the (Draper Expert) charger in the garage and runs to the white 7-pin electrics of my tow-bar, which means I can put the battery on an overnight trickle charge when the car is locked.

Click image to enlarge


This morning, I was pleased to find that the battery lamp on the charger was indicating green, meaning it was fully charged. I pulled the plug out and fetched a multimeter to see what it was showing:

Click image to enlarge


Whistle The older I get, the more I realise that people confuse wrinkles for wisdom Smile
Post #607420 26th Sep 2021 4:12pm
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knwatkins



Member Since: 11 Sep 2020
Location: Poole, Dorset
Posts: 778
United Kingdom 2014 Range Rover Vogue SE SDV8 Corris Grey

That'll be surface charge on the battery. It's isn't an accurate reading.

You should leave the battery for 12 hours for the surface charge to disappate before taking a voltage reading. Turning your headlights on for a couple minutes should achieve the same thing also. As soon as current is drawn, the voltage will settle down to the nominal battery voltage. Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey
Post #607434 26th Sep 2021 4:50pm
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Rambles



Member Since: 16 Apr 2011
Location: UK
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2011 Range Rover Vogue SE TDV8 Stornoway Grey

The AGMs typically operate at 70% to 80% charged in operation. So 12.3 could be a typical voltage reading after a long run.
Post #607439 26th Sep 2021 5:24pm
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Rambles



Member Since: 16 Apr 2011
Location: UK
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2011 Range Rover Vogue SE TDV8 Stornoway Grey

deleted repeat post
Post #607440 26th Sep 2021 5:24pm
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JMC



Member Since: 01 Feb 2009
Location: Aberdeen-Angus
Posts: 786
Scotland 2012 Range Rover Westminster TDV8 Orkney Grey

knwatkins wrote:
You should leave the battery for 12 hours for the surface charge to disappate before taking a voltage reading.

Twelve hours on and I've re-checked the battery voltage. It's currently sitting at 12.81v which I'm very happy with.

The car is new to me, so I've no idea how old the battery actually is. Thumbs Up The older I get, the more I realise that people confuse wrinkles for wisdom Smile
Post #607481 26th Sep 2021 10:51pm
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knwatkins



Member Since: 11 Sep 2020
Location: Poole, Dorset
Posts: 778
United Kingdom 2014 Range Rover Vogue SE SDV8 Corris Grey

That's great Thumbs Up Kev

2014 L405 RR Vogue SE 4.4 SDV8 in Corris Grey
2010 L320 RRS HSE 3.0 TDV6 in Stornoway Grey
Post #607504 27th Sep 2021 1:35pm
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