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Key fob battery warning


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26 minutes ago, hiace_drifter said:

When I get into my 14 plate focus I get a message saying the keyfob battery needs replacing ... but I have tested the battery and it is 90%... do i ignore the warning? Change the battery anyway? Thanks!

When you say, 90%, what is the specific voltage? A fresh out of the box battery will usually read 3.3v, anything less than 2.9v is worth replacing...

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5 minutes ago, StephenFord said:

When you say, 90%, what is the specific voltage? A fresh out of the box battery will usually read 3.3v, anything less than 2.9v is worth replacing...

I checked it on a battery tester (shows a digital scale from 0-20 approx). I'll fish out the multi meter and get a bit more scientific! thanks 🙂

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I agree with frembrit, had lots of trouble on my wife’s Mazda 2 until I bought Duracell instead of cheap ones. But get from a proper shop. Buying branded makes on eBay etc is a bit of a lottery on fake stuff

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8 hours ago, hiace_drifter said:

When I get into my 14 plate focus I get a message saying the keyfob battery needs replacing ... but I have tested the battery and it is 90%... do i ignore the warning? Change the battery anyway? Thanks!

That type of battery will read full voltage up to the point it fails, if it reads lower than spec then its expired.

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I haven’t tried all makes but the Duracell in my wife’s Mazda 2 has lasted about 5 years. It’s just getting iffy now. It’s an annoying size 1620 . No supermarkets / high street shops seem to do that size. Just ordered on eBay but might be fake, will have to wait and see how well it works/lasts

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8 minutes ago, isetta said:

I haven’t tried all makes but the Duracell in my wife’s Mazda 2 has lasted about 5 years. It’s just getting iffy now. It’s an annoying size 1620 . No supermarkets / high street shops seem to do that size.

May (or may not) interest you to know that the ref number gives much detail. 1st 2 x digits are diameter in mm, and last 2, are the thickness in 1/10 mm. Once you know that you can temporarily bodge a battery if immediate fit not to hand! :thumbs_up:

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Hi Stephen, yes I was aware of the sizes in the code. Eg if you need a 2032 and you only have a 2016 then it will do the job (but not last as long) . But 1620 is an unusual one, I don’t think there are others of the same diameter. 

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9 hours ago, isetta said:

Hi Stephen, yes I was aware of the sizes in the code. Eg if you need a 2032 and you only have a 2016 then it will do the job (but not last as long) . But 1620 is an unusual one, I don’t think there are others of the same diameter. 

It is unusual, though I have 3 x '16's (20, 32, 16) in my battery box, all bought online as you just can't buy then in store any longer...

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