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PostPosted: Sun Jul 20, 2014 8:25 pm 
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Joined: Fri Dec 23, 2011 10:43 pm
Posts: 3
I just replaced both batteries in my sram s975 SRM, and everything seemed to go smoothly. The zero offset was right around where it had been before the thing ran low on battery, so it seemed alright. I took it out today, and 95% of the time, everything matched the numbers I was getting with my other SRM. But every once-in-a-while, the power numbers would about double for a bit (5-6 seconds), and then go below what I knew I was doing, and finally settle back around where I expected it. When this happened, I would go re-zero it, and the ZO was almost exactly what it had been before. Normally, I would blame this on the garmin trying to auto-zero it when it shouldn't, but that never happened nearly this often. On longer stretches of around constant power, this happened a lot less often, it seemed more frequent with stop-and-go.
I'm wondering if anyone's seen something like this after replacing batteries?

EDIT: Here's a screencap of what happens. The cadence data is fine, but the power spikes up for around 2 seconds, and then down to 0 for one, and then back to normal.
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PostPosted: Tue May 05, 2015 2:32 pm 
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Location: Vicenza
Hey guys,
I've got a friend who needs to replace the battery on his PCV (see picture attached) and I told him he can use a normal battery but he's worried cause there's 3 wires; anyone can help?
Thanks in advance!

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Posted: Tue May 05, 2015 2:32 pm 


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PostPosted: Tue May 05, 2015 2:51 pm 
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Posts: 194
It looks like they added a diode. I wonder if they also severed a trace on the PCB.

I've always just used a cylindrical CR2-sized lithium ion battery with a round PCM at its base. It fits a lot better and gives you a lot more battery life. I only connected two wires, the red and black.

I guess if it was me I would desolder the diode and try with just the black and red wires. If it doesn't charge then put the diode back.


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PostPosted: Tue May 05, 2015 9:00 pm 
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Joined: Wed Jun 09, 2010 10:44 am
Posts: 266
I had 2 PCV's. One had the Diode, one didn't, so don't suppose its too important.

My guess is it's probably there to stop the battery discharging back into the charger or wiring harness in the event of a short circuit.

Do what Squint says, its what I did.

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