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Battery Contact Corrosion

Battery Contact Corrosion

Battery Contact Corrosion

I am having problems with AA batteries and the contacts to the battery terminal in a battery pack.  The battery pack will hold 6 batteries.  It appears that a green patina forms on the contacts in the holder.  It does not look like the batteries are leaking.  Is this a unique phenomena or should I be concerned.  I have several thousand instruments with this battery pack installed.

RE: Battery Contact Corrosion

It is not unusual for the positive post of a battery to oxidize.  Look at your automotive battery and you will see an example of this "black post" problem.  However, there are many 9-volt battery system in use and I haven't heard of them having trouble.  Of course, those systems do not use a copper connector.  You might want to switch to a cupro-nickel or stainless steel.

A trick I've used is to coat the system with sodium silicate, "egg saver" we farm kids use to call it, to inhibit the corrosion.

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