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-   -   Key Fob Battery - When is it dead V wise? (http://forums.pelicanparts.com/off-topic-discussions/829262-key-fob-battery-when-dead-v-wise.html)

Bob Kontak 09-10-2014 01:58 PM
Key Fob Battery - When is it dead V wise?
 
Key fob has a 2032 disc battery. 3V. Puts out 2.92V with VM.

Is she dead wrt the fob functioning?

island911 09-10-2014 02:57 PM
I can tell you that with my Cayenne keyfob, that the battery has to have higher than normal voltage when the contact has green corrosion. :-/

I've been meaning to write this up for the Cayenne forum, but in short, the contact that grabs the side of the battery is not soldered to the board. (it's a spring contact) This (with a little moisture) allows the contact pad, on the PCB (printed circuit board) to corrode, and add resistance to the path. Then batteries seem to toast quickly. But really, it's this bad contact that is casing problems.

Bob Kontak 09-10-2014 03:33 PM
Quote:
Originally Posted by island911 (Post 8255884)
I can tell you that with my Cayenne keyfob, that the battery has to have higher than normal voltage when the contact has green corrosion. :-/

I've been meaning to write this up for the Cayenne forum, but in short, the contact that grabs the side of the battery is not soldered to the board. (it's a spring contact) This (with a little moisture) allows the contact pad, on the PCB (printed circuit board) to corrode, and add resistance to the path. Then batteries seem to toast quickly. But really, it's this bad contact that is casing problems.
Thx - spring thingie had broken away and I re-soldered. Gonna go nut up and pay the $5 to check. Back in a bit.

Bob Kontak 09-10-2014 03:59 PM
Quote:
Originally Posted by Bob Kontak (Post 8255960)
Gonna go nut up and pay the $5 to check. Back in a bit.
Works like a charm.

Thanks for your time island911.

john70t 09-10-2014 08:06 PM
A swipe with WD40 on a rag probably wouldn't hurt.
It helps with sticky outlets as well.

1990C4S 09-11-2014 11:09 AM
Batteries typically need a load to be tested. Open circuit voltage is not a good indicator.

rick-l 09-11-2014 07:22 PM
The total capacity is measured until the battery is at 2 Volts.

http://data.energizer.com/PDFs/cr2032.pdf

island911 09-17-2014 02:33 PM
Quote:
Originally Posted by Bob Kontak (Post 8256007)
Works like a charm.

Thanks for your time island911.
Glad to help.

Key remotes, they may be expensive, but at least they are fragile. :-/


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