In message , Douglas de Lacey
writes
I have a 4 year-old Smiths Timeguard ZV700 switch, whose timer
mechanism has ceased to function: the lcd display is blank. I suspect
the internal battery is dead. Smiths helpline is most unhelpful: no
user-servicable parts and we don't do repairs. Does anyone know (a) how
plausible my suspicion is and (b) what the internal rechargeable
battery is likely to be? It has "061" printed on a green sleeve;
nothing I can see on the battery itself.

Email me a photo or two

--
geoff