Where is the battery of hayabusa - GSX 1300 R Hayabusa Suzuki Motorcycles

Check your bridge rectifier for a bad diode leaking power to ground.

maybe a bad battery , if you can check water level in battery , give battery a good charge , get battery load tested , also check to make sure there,s nothing staying on after switch is turned off

if bike has a computer chip i it it may need resetting o a diagnostic mmachine

bad battery

bypass the starter solenoid crossing the 2 bolts, does this turn the starter motor?

change the spark plug?

Try to clean the throttle body air intake and rev it up a little there may be a blockage that the ECM may have been compensating for when you disconnected the battery the ECM will assume the throttle body is clean and closing fully but dirty carbon may keep throttle open slightly saucing rough running or stalling. Hope this helps

Remove the passenger's seat with the key.Then remove the bolts #13 http://www.babbittsonline.com/suzuki-motorcycle-parts#/Suzuki/GSX1300R_(2006)/SEAT_(MODEL_K6)/022470005/56022470050B
on each side and take off the driver's seat. The battery is underneath.

CHECK THE FUSE IN YOUR STARTER RELAY
I BELIEVE ITS UNDER THE SEAT

there are two allen head screws under the front of the seat that go into the top of the frame. remove the 2 screws and lift the seat from the front and slide forward. voila the seat has been removed.