[Boatanchors] GEL CELLS

[John via Boatanchors]

Greetings,
 
Several years ago, I bought a case of gell cells at a hamfest.   They  were 
rated at 12V, 7A.   They were supposedly "recent pulls"  having full 
capacity. Today I needed one as a replacement in a UPS unit and  found that only 
one was at full terminal voltage and would work in the UPS.  Several others 
were at 6V and the remainder essentially dead.
 
Does anyone know of a safe way to restore these batteries or should I take  
them to the recycle place?
 
Thanks and 73, 
 
 John,  W4AWM