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Button Cell Voltage? #4638920
01/18/18 04:18 PM
01/18/18 04:18 PM
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maverickfhs Offline OP
maverickfhs  Offline OP

Joined: Dec 2016
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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 205K/AT
2006 Acura TSX 187K/AT
2007 Accord VP 151K/AT
Re: Button Cell Voltage? [Re: maverickfhs] #4638948
01/18/18 04:53 PM
01/18/18 04:53 PM
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ZeeOSix Offline
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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
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Wolf359 Offline
Wolf359  Offline

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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
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eljefino Online content
eljefino  Online Content

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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
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Perth, Western Australia
Brad_C Offline
Brad_C  Offline

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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
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maverickfhs Offline OP
maverickfhs  Offline OP

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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 205K/AT
2006 Acura TSX 187K/AT
2007 Accord VP 151K/AT
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