On 20/02/2010 12:42 PM, Jim Yanik wrote:

This is not generally a good idea. Replacing the bad cells in one
battery with new, good cells, is likely to cause cell reversal during
operation.

You also have OLD cells with lots of charge cycles mixed with new cells,and
the old cells will fail sooner.

Sure, but surplus battery packs would more then likely be very similar,
if not a little on the depreciated side.