Hey all, I was wondering if anyone had an idea how small of a battery would work for an '81 sr250, i'm trying to eliminate space and weight and fabricate a seat around the battery, but I wasn't sure how small a battery I could go; any help would be appreciated

12 volt 12 amps I think is the standard spec so the smallest 12v 12a you can find. If you look for gel filled ones you can fit these at an angle and they will not leak so gives you more options.