In article <4nf7pn$7dp@aggedor.rmit.EDU.AU>, s923336@minyos.its.rmit.EDU.AU says...

>I have used my SB25 for two years without problems. Today I
>discovered it had some strange discrete noise at the very beginning
>of recharging (not the normal sound from recharging). Could that be >caused by batteries or something else? I used a new set of >rechargeable batteries today.

I think you will find that using fresh batteries has solved the
problem. Try draining each battery separately in the old set down
to about .5-.7 volts before recharging (it may take a couple of
cycles of this to resussitate the batteries, if it is still possible).
Hope This Helps