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You could load test the battery ,to see if its good ,if it is good or new,it may be your stator,or charging system.You could check the voltage of the battery while its running to see if its charging. I found ,they dont like not being started,or sitting for awhile. Ive installed a battery tender ,that keeps my battery fully charged even if you let the bike sit for extended periods of time. Its a very low amp charging system ,then turns itself on and off,to keep your battery fully charged. Sometimes there called Float chargers too.
It sounds like a problem with the charging circuit. You should be able to ride with your lights on!
The first thing to do is put a multimeter set to DC Volts across the battery with the engine running. Are you seeing more than 13.5 volts? If not there is a charging problem. It could be the regulator/rectifier or the stator windings, or just loose electrical connections if you are very lucky. I have a manual for the 900 Fireblade (I used to have a 98 Blade) so let me know if you need anymore help.
And it doesn't start? The clicking sound is the starter relay (aka starter solenoid). If the battery is fully charged and all you hear is the relay clicking, then you've got either a defective relay, a bad starter motor, or faulty wiring between those two.
Most likely, it is a bad relay. To find out, locate the relay and use a large screwdriver to bridge across the two large cables that are bolted to the top of it. If the starter spins the engine when you do this - then you've definitely got a bad relay. If the starter does not spin, then it's either the starter motor or a bad cable connection going to it.
To clarify.... Have you had it on a trickle charge? Do you ride it all the time? Alarm? Sounds to me (with out being there) like a common problem....But I would need to hear it. Does it run sluggish just before it stalls or dies? If yes to most or all of those it may be that your battery isnt hold a charge. You have to run your bike at high RPM for it to properly charge. Just starting it in the garage from time to time dosnt really charge the battery. Take it to autozone and get a good charge on it if you havnt already. It take 3 hours to charge that battery fully. Also another 2 things strike me as well. 1.It could be the tilt sensor isnt operating properly. 2. The kick stand sensor or kick stand loose. I would try those first. Let me know.
check the battery voltage with a multimeter, it should read approx. 12 volts. with the meter connected to the battery turn the key to on, turn on brights, turn signal and press brake lever. if goes below 9 volts, charge the battery and try again. if still goes below 9 volts replace the battery. when you get a good battery, start the bike and check charging voltage. should be around 14.7 volts at 5k RPM. if you have low charging voltage, let me know.