Did it start when you put it back on? I started with the square plastic thing from the local car spares, and a 12 v motorbike battery, not great but it worked, then I got a job in a place that had one or two sealed alarm batteries knocking about no more holes in my coat or jeans, well not fro acid anyway, as one bloke said earlier I remember getting the lazerlight from Johnson fieldsports, that really did transform things for me, nowadays use the smaller lighter shooterlight.
I knew it wouldnt,so walked home,put the battery on charge and took it on the bike next day,lol..Forgot,it wasnt