I'd tread carefully from here. We set up some landmines a couple years back, in case any more moles got through. Fuzzy little bastards dug a hole in my futon, so I pulled out all the stops. Those things have a remarkedly long battery life.
I mean the landmines, not the moles. Battery powered moles wouldn't make any sense. That being said, I'm not sure how many torches I put up. I'd keep it safe and look out for mines, even not around torches. I'm sure you can see far enough to spot them before they explode