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#4638920 - 01/18/18 03:18 PM Button Cell Voltage?
maverickfhs Offline


Registered: 12/28/16
Posts: 2076
Loc: VA
So I just replaced a key fob battery(CR1616) on my Civic, since it was working intermittently during brutal cold.

I checked voltage and new cell is showing 3.33V and one which came out is showing 2.96V.

Question is, if it's below 3V then it's almost dead?

I wasn't able to remove that dang screw and rounded it off, but some how hacked it after seeing a youtube video.

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2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT

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#4638948 - 01/18/18 03:53 PM Re: Button Cell Voltage? [Re: maverickfhs]
ZeeOSix Offline


Registered: 07/22/10
Posts: 17911
Loc: PNW
Only data point I have is button cell batteries used in my laser pistol grip. New they measure at 3.33 volts, and the laser barely lights when they get down to 3.17 volts. So yeah, I'd say at 2.96 volts they are pretty much wasted regardless of what they are in.

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#4639016 - 01/18/18 05:02 PM Re: Button Cell Voltage? [Re: maverickfhs]
Wolf359 Offline


Registered: 04/27/12
Posts: 4891
Loc: MA
The ones I get, 2025's have 3.35v when new. My keyless go starts to complain about a weak battery when it hits 3.06 so I end up putting new ones in when it hits that. So I guess 2.96 is dead.

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#4639056 - 01/18/18 05:40 PM Re: Button Cell Voltage? [Re: maverickfhs]
eljefino Offline


Registered: 06/15/03
Posts: 32775
Loc: ME
The rating is a nominal voltage. You may find they dip down to 3.0V when any sort of load is on them.

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#4639170 - 01/18/18 07:02 PM Re: Button Cell Voltage? [Re: eljefino]
Brad_C Online   content


Registered: 07/27/12
Posts: 637
Loc: Perth, Western Australia
Originally Posted By: eljefino
The rating is a nominal voltage. You may find they dip down to 3.0V when any sort of load is on them.


Yes, but a newish cell with an open circuit voltage of about 3.3V may dip below 3, a well loved cell with an OCV below 3V will collapse under load.

My rule is if the device is misbehaving and the OCV is below 3.2 I replace them. If I've taken the time to pop the cover and the battery isn't near enough to as-new I might as well replace it.

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#4639179 - 01/18/18 07:11 PM Re: Button Cell Voltage? [Re: maverickfhs]
maverickfhs Offline


Registered: 12/28/16
Posts: 2076
Loc: VA
Yes, thanks for the confirmation. Key was acting up during cold weather. Otherwise, it was just fine. I did replace it with a new cell. Let's see how long it'll last.
_________________________
2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT

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