VSX48 Speaker Proccessor Unit

[BathGnomeAudio1960]

Hello guys!
I have recently brought my two VSX48's out to use after a time in storage and found the delay setting I had on the outputs of both units are all gone. Can anyone tell me if there is a backup battery within the units? If so, where is it and how do I change it? Also which type of battery do I need for correct operation?

Any help on this matter would be very gratefully received.

Cheers!
Colin

Also, are there any other units that perform the same as a VSX48?