hi again I read about your battery swap
the grey wire on the Ipod player is may be for the second grups of cells
-parallel conected for higher capacity
you better open the battery pack and see how the cells are connected and
solder the grey and white wires together
if you used the batery without the grey wire you may get twice less capacity
and without charging the second group parallel connected cells they may have already damaged
so you better disconnect the pack from your player and gently open the batt pack and whink about better connection
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