jemhayward wrote: 
> Ah!  I think I can modify this to do what I want.  If I use a relay held
> open by the offboard PSU 5v and a 6V rechargeable battery pack (need to
> isolate the relay from the battery pack somehow...) then when the
> external PSU goes down, the relay closes, and that initiates shutdown,
> and then the 6V battery powers the board until its completely shut down.
> I then need a way to disconnect the battery, or it will go flat - or I
> could possibly use a big capacitor?

If you're using an external 5 volts power supply there is no need for a
battery.
Why do yo want to use a battery?



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