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Old 20 July 2007, 14:08   #1
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Battery, dud or goer

How do I check if a 12v battery is OK, I don't have a specific graverty do da. I have a multi-meter tho.
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Old 20 July 2007, 14:16   #2
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Andy,

I suppose you've dismissed taking it to Halfords. They do it for free.

Nick.
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Old 20 July 2007, 14:38   #3
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Thought I'd ask here first. It's a "new" battery and the little green blob isn't showing. I took delivery of it yesterday and put it on charge. Seemed to charge OK, but still no green blob. Any suggestions?
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Old 20 July 2007, 15:23   #4
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My green blob never showed in the three years I had the battery on the boat. Worked absolutely fine tho.

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Old 20 July 2007, 15:32   #5
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Don't you get the coloured blob when its knackered ?
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Old 20 July 2007, 15:54   #6
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You should get the green blob when it's OK. It'll go black if it's discharged (it's not an indicator of it being knackered)


Tap it fairly hard in the area of the blob with your finger.

If that doesn't work,the thing with the green blob should be screw in like a cell cap at a guess.Take it out. The green blob is a plastic bead. Make sure it can move. They get stuck.
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Old 20 July 2007, 16:07   #7
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OK, I did take it out and give it a tap and yes it did look rather sticky in the bottom.

V's read 12.99 so I guess that's a healthy voltage

I'll leave some positive feedback now.
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Old 20 July 2007, 16:25   #8
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As a rough guide:- A reading of 12.66 volts indicates a fully charged battery; 12.45 volts is 75% charged, 12.24 volts is 50% charged, and 12.06 volts is 25% charged. These values are for a battery off load and only a general indication. To fully check the battery's condition you would need to do a full load test.
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Old 20 July 2007, 17:31   #9
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If you can get the battery out, take it to a garage and have them do a load test on it. Rechargeables often will take and show a full charge, but the voltage diminishes rapidly as current is drawn from it. Mostly a symptom of sulfation not allowing lead to acid exposure, I think.

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Old 21 July 2007, 12:55   #10
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Quote:
Originally Posted by Hightower View Post
OK, I did take it out and give it a tap and yes it did look rather sticky in the bottom.

V's read 12.99 so I guess that's a healthy voltage

I'll leave some positive feedback now.
I got an energy 85AH leisure battery from eBAY (one of these http://cgi.ebay.co.uk/NEW-85AH-CARAV...QQcmdZViewItem)
that I also couldn't see the green dot. The rest voltage was 12.68V (just dug out emails). When I contacted the seller he told me they were really difficult to see and sure enough when I looked at it under a better light the green dot was visible. Voltage sounds fine for your battery.
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