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Battery reads 15.4V

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ginger_jim:
Hi all, thought i'd check my battery voltage yesterday and got the above reading.  Battery is a year old and visually looks good, Dave Silver 'MF' from memory, spent the winter being plugged into an optimate for 24 hours once a week and insulated against the cold.  I instantly though dodgy meter, so I checked my beemer battery which has been maintained the same way (its an odyssey) and it gave a similar reading.  Went and checked my van battery and it read 13.4 volts. 

Anyone had similar experiences?  Could the optimate be on the way out and both batteries are toast?  :'(

SteveD CB500K0:
That's too high. Even on charge it should only reach 14.6 or 14.7V.

Is that open circuit?

Steve

ginger_jim:
Hi Steve, I apologise for my ignorance but im not quite sure what you mean :-)

JamesH:
Steve means (i think) is that is the meter reading with both leads from the bike loom / earth cable removed (i.e. with the batter disconnected from the bike).?

ginger_jim:
No, that's with everything connected.  The more I think about it the meter must be at fault. Ill borrow another meter to double check.

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