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Button Cell Voltage? #4638920
01/18/18 04:18 PM
01/18/18 04:18 PM
Joined: Dec 2016
Posts: 2,170
VA
maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,170
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.

thumbsup


2006 Civic EX 202K/AT
2006 Acura TSX 180K/AT
Re: Button Cell Voltage? [Re: maverickfhs] #4638948
01/18/18 04:53 PM
01/18/18 04:53 PM
Joined: Jul 2010
Posts: 18,749
PNW
ZeeOSix Offline
ZeeOSix  Offline
Joined: Jul 2010
Posts: 18,749
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.

Re: Button Cell Voltage? [Re: maverickfhs] #4639016
01/18/18 06:02 PM
01/18/18 06:02 PM
Joined: Apr 2012
Posts: 5,167
MA
Wolf359 Offline
Wolf359  Offline
Joined: Apr 2012
Posts: 5,167
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.

Re: Button Cell Voltage? [Re: maverickfhs] #4639056
01/18/18 06:40 PM
01/18/18 06:40 PM
Joined: Jun 2003
Posts: 33,110
ME
eljefino Offline
eljefino  Offline
Joined: Jun 2003
Posts: 33,110
ME
The rating is a nominal voltage. You may find they dip down to 3.0V when any sort of load is on them.

Re: Button Cell Voltage? [Re: eljefino] #4639170
01/18/18 08:02 PM
01/18/18 08:02 PM
Joined: Jul 2012
Posts: 663
Perth, Western Australia
Brad_C Offline
Brad_C  Offline
Joined: Jul 2012
Posts: 663
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.

Re: Button Cell Voltage? [Re: maverickfhs] #4639179
01/18/18 08:11 PM
01/18/18 08:11 PM
Joined: Dec 2016
Posts: 2,170
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maverickfhs Offline OP
maverickfhs  Offline OP
Joined: Dec 2016
Posts: 2,170
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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