Computing stuff tied to the physical world

RTC battery fix

In Hardware on Feb 1, 2010 at 00:01

I’ve been getting some email about the RTC Plugs not retaining their clock. It turns out that there is a problem:


The center contact of the battery “holder” is the PCB itself, and being gold-plated, I thought it’d be best to keep it as is.

The problem is that the solder mask layer can be slightly thicker than the gold-plated pad, causing the battery to not make contact – despite the pressure of the metal clip.

This can be fixed by adding a small dab of solder:


This will cause the coin cell to press more against both contacts, so a good connection is virtually guaranteed.

Needless to say, I’ve updated all RTC plugs here and will ship this improved version from now on.

  1. “causing the battery to not may contact” should read: “causing the battery to not make contact”

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