Tell you what. You tell us what the make and model of your oven is and we'll have a quick web search, find the manual, have a quick read and post a reply with the information you need and a sarcastic comment about how you couldn't be bpothered to do a simple search for yourself.
Alternatively, you could search for the particular make and model of your oven, find the manual, have a quick read and feel smug that you have found out what you need all by yourself.
Thinking about this a little further, if your cooker has a fuse (and plug) then why is it likely to have a battery powered ignitor?
You could check - say - espares.co.uk for a replacement ignition transformer fo ryour make and model cooker, after checking the switch is working OK.
Just a thought, of course.
XXX, January 2016