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Minimum Voltage On 9Er Battery From Shop?


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#1 Bjørge

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Posted 04 April 2020 - 10:26 am

I know the answer to this is round ere somewhere, but I can't find it. Just bought a new 9er battery, measuring 12.3V when I opened the box. Is this ok, or should I return it?
ISTM these batteries are more vulnerable than the old fashioned ones used in the Mk1, is that so?
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#2 jiff

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Posted 04 April 2020 - 11:53 am

.....my notes from. previous problems .....assisted by wisdom on here, say:

 

12.2v is considered discharged

12.3 + is ok for a cold bike, un run

start bike&run

Shouldn’t exceed 14.4v

 

This may be helpful.....or not !

I’d put battery in, run it.... and see if it accepts charge, and retains it for a few days

 

but what do I know...........More reliable wisdom may be along in a mo.



#3 spike240

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Posted 04 April 2020 - 08:04 pm

Not an expert by any means, but fully charged it should read about 12.6-12.7v. But i recently bought a new battery mail order, and here in UK they have to fill the battery with acid (they used to send them dry), but I don't think they charge them. So either put it on charge for a couple of hours before fitting or like jiff says bung it on and try it.
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#4 fixitsan

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Posted 04 April 2020 - 11:00 pm

They self discharge over time. Check the date labels, one might even tell you when it's next due for a charge. the dates have a bit of leniancy about them, but before anything else pop it on charge, a lead acid cell which is sat at a low voltage for a long period ages more quickly


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#5 Bjørge

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Posted 05 April 2020 - 02:18 pm

Thanks, all! I charged it overnight, disconnected the charger this morning and now it holds 13.0V. The old battery - same brand - did 12.7 & only achieved about one rev on the starter before it died.
So I'm positive! Guess I'll pick up the bike tomorrow 😎
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#6 Bjørge

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Posted 07 April 2020 - 05:59 am

The bike started in 0.4 secs with the new battrry 😎👌
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