Wayne Chirnside wrote in a message to Roy J. Tellason:

 WC> Likely corrosion I missed on cleaning as Matt suggested the 
 WC> blasted bottom of the top contact is tough to get to but I've 
 WC> made a tool with some extreamly fine sandpaper and shall slip that 
 WC> between the cell and upper contact 

An emery board would work here,  maybe.

 WC> and follow up with an alcohol soaked business card to remove any 
 WC> residue. Fortunately the board is mounted up the side of the case 
 WC> so any debris will not fall into anything.

Sounds good.  I look forward to hearing how it turns out...

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