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BR2325 voltage range - fake battery?

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matthuszagh:
I recently received an instrument sold for parts displaying an error indicating loss of calibration data. The cal data is made persistent by a 3V BR2325 coin cell (https://www.mouser.com/datasheet/2/315/AAA4000C226-1889696.pdf). So, I ordered some replacements from amazon. They arrived today and I tested the voltage first through a 10 MOhm resistance (my multimeter presents 10MOhm at its highest range). I was surprised to see it read 3.38 V, which seems pretty high for a 3 V nominal level. I also checked the datasheet (see link) and the "Operating voltage vs. load resistance" chart shows a voltage a 3 V for this load at room temp. I didn't, however, see any sort of max/min specs. Is this a reasonable voltage level, or is there a good chance this is a fake battery.

Another question: when I measured the existing battery voltage it read 2.93 V under load, which seems ok to me. At what level would I want to replace this?

bdunham7:
Your battery is not fake, that is about what you should see from a new one, or even perhaps a bit  more.  3V open circuit is dead for those, 2.93 is good and dead.

ebastler:

--- Quote from: matthuszagh on June 03, 2022, 12:51:07 am ---I also checked the datasheet (see link) and the "Operating voltage vs. load resistance" chart shows a voltage a 3 V for this load at room temp.

--- End quote ---
Please note that the "Operating voltage vs. load resistance" chart in the datasheet refers to a half-discharged battery.


--- Quote from: bdunham7 on June 03, 2022, 01:03:19 am ---2.93 is good and dead.

--- End quote ---
You mean "good and not dead", I assume?

bdunham7:

--- Quote from: ebastler on June 04, 2022, 04:28:31 pm ---You mean "good and not dead", I assume?

--- End quote ---

No, <3V open circuit (or with a 10M DMM) for a coin cell is completely dead for most practical purposes.  Some very low drain devices might live on for a while, but most will have stopped functioning at that point.

tooki:

--- Quote from: ebastler on June 04, 2022, 04:28:31 pm ---
--- Quote from: bdunham7 on June 03, 2022, 01:03:19 am ---2.93 is good and dead.

--- End quote ---
You mean "good and not dead", I assume?

--- End quote ---
No. In English, “good and [adjective]” means “very [adjective]”, so “good and dead” means “so richtig tot”. ;)

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