nimh replacement batteries for nicad cordless drill

I had a craftsman 14.4v cordless drill that was in good shape except
for the ni-cads losing their charge capacity. I jolted each one of
the cells a few years ago and got great results at that time. Now
that the problem resurfaced...I tried it again with no luck. Since
NiMH cells were available, I decided to replace all the cells with
these. For some reason both of the two packs never seem to get much
of a charge. Is there something special these type packs need in
terms of charging? Or is there something inherently missing by using
a nicad charger on a NiMH battery pack?

-Inet
.

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