The 7600GR, if you just leave it around for a month or so running its
clock, will badly wobble the weakest cell, which will be reverse-charged
by the stronger cells, if you use rechargeables (which everybody does).
Replace the batteries very regularly even if you don't play it.
I can generally revive the weakest cell using an old charger to
start it off, and then cycling it in a modern charger a few times,
but it would be better not to let the other cells get to it at all.
It's not a matter of running the voltage down to .6V, but that by
that time, the weakest cell is already charged backwards by the others.
--
Ron Hardin
On the internet, nobody knows you're a jerk.