12v Battery voltage is 15v, not an overcharging issue!

[chris-red]

What would cause a 12v battery to put out 15v? I bought the battery new, filled it with electrolyte left it overnight and in the morning it was 15v, I trickled charged it with an optimate and still 15v, the electrolyte level is correct. What would cause this?
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Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[Copycat73]

try a different volt meter.
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Whatever I post I have no citation and no intention of providing one..
caveat emptor

[chris-red]

[Copycat73]

leave it to stand 24 hours.
____________________
Whatever I post I have no citation and no intention of providing one..
caveat emptor

[chris-red]

[pdg]

On a normal digital meter display the '5' and the '2' are pretty much mirror images of each other. Here is a '5' followed by a '2'

https://image.shutterstock.com/display_pic_with_logo/61711/61711,1298051348,2/stock-photo-number-from-white-digital-display-series-71444248.jpghttps://image.shutterstock.com/display_pic_with_logo/61711/61711,1298051037,1/stock-photo-number-from-white-digital-display-series-71444254.jpg





To that end, have you checked your eyes are both in the right way round and pointing the same direction?
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Any and all advice given should not be followed - if you have to ask it means you don't know so get a man in to do it for you.

[RhynoCZ]

15v you say? No es posible.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[G]

If it's actually putting out 15v, the optimate shouldn't even try and charge it - it should immediately see it as (beyond) fully charged.

If it was a 7 cell rather than 6 cell lead acid battery I'd expect it to be putting out around 15v, but that seems unlikely.

If it was a lithium battery, also possible - but filling it with battery acid probably would have changed that!

[Copycat73]

in true BCF tradition ...
jpg.s of said battery and volt meters showin voltage readin ...
or it never happened...
____________________
Whatever I post I have no citation and no intention of providing one..
caveat emptor

[stinkwheel]

What happens under load? Say with a bulb running off it.
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[Islander]

[WD Forte]

Odd that
was wondering if a broken or cracked plate may have that effect?
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bikers smell of wee

[RidingBear]

as far as I understand, having 15 V is not possible. the voltage of each cell for a lead acid battery is normally 2.1-2.3 V. small variations are due to how the battery is made, but the voltage range is determined by the electromotive force which is given by the chemical reaction between the lead plates and the acid. having a broken plate would not increase the voltage.

15/6=2.5 V per cell. that's how they are charged (the chemical reaction is forced in the opposite direction).

[chris-red]

Ignore me, My meter was running low on battery since replacing it is now showing 12v. Dad told me he had the same with his meter, maybe he used mine...
____________________
Well, you know what they say. If you want to save the world, you have to push a few old ladies down the stairs.
Skudd:- Perhaps she just thinks you are a window licker and is being nice just in case she becomes another Jill Dando.
WANTED:- Fujinon (Fuji) M42 (Screw on) lenses, let me know if you have anything.

[RhynoCZ]

No way.
____________________
'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[moonzoomer]

[Islander]

[WD Forte]