Go on the physical size if the battery, the largest that you can fit in the space, higher the amp/hours, the longer it will stay on during a power cut. AS for the bell box, variable in size and type, if you remove powere from the control, or use a test to check outside unit, If it sounds for about 10 mins, should be ok, other wise you would have to open it up to find out. batteries also available at places such as Maplins, RS spares Farnell etc.
SD
March 2012