Quartz Clock With No Battery

[Bert]

I have a Kelloggs Raisin Splitz quartz clock with alarm function. It's been in the loft for years. Obviously it's blank. I undid the back (held on by four of the smallest screws in the world!) to see what type of battery it had. There is no battery. It has two spring contacts to (presumably) two different metals on the back cover plate. It must work on the voltage between two different metals. I tried scratching the metals in the are of the contacts, but it still didn't work. Any ideas on how I might get it working? It's only a 'toy', but it would please me if I could get the display up again.

[stuey]

Is it solar powered?

[gingejbee]

Already answered on duplicate posting....