General > General Technical Chat
WTF Mouser??
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james_s:
I assume the date code is one of those numbers printed on them, I don't know how to decode them but the picture shows the actual units in question.

The thing I like about these PowerCap things is that the battery is not potted and could be easily replaced. I'm surprised even expired ones were only good for 2 years, I've had some of these Dallas parts that still worked when they were 20 years old.
Munich:
I just looked back and those are the exact part number that I had fail early... What are the chances?  However, mine arrived in tubes.  I should have pulled the coin cell to see who made it, I realize the packaging could very likely be the cause, but you never know...  I've had numerous counterfeit coin cell problems in the past few years...

I believe that date code is the 35th week of 2018 so they shouldn't be past shelf life.   :-//
james_s:
Well I can open one of these up to look at the battery, they come apart pretty easily. I was looking at one earlier and noticed there's foam bits stuck in the seam around the perimeter of the battery, they've probably drained even further since I unpacked them.
Munich:
What is the resistance between two points(of same distance of those battery terminals) on that foam?  You could calculate approximate charge loss over time and come up with an idea of how much is missing.

It really interests me that you had failure on this same part number as I did a while back.  As I recall, they weren't cheap, and I love free replacements  ;D
james_s:
The resistance depends on pressure and surface area, but just touching probe tips a few mm apart results in less than 100k. The battery has a much larger surface area and with the package closed the pressure is reasonably firm.

The first time I ordered one of these I didn't open the package for a week because I was waiting for PCBs to arrive and in that case the battery was down below 0.6V.
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