had this happen too when i first got my 1098 and after searching i thought it was a dead battery too. Tried to start the bike on a cold day and it cranked but barely and just shut off. tried it again and still nothing. I let the bike sit with the key on to look through the dash and see if there was any warning lights and after about 5 minutes of scrolling through i decided to try to start again and this time it worked. Found out from the old owner he had switched to a Shorai battery and it required to be warmed up prior to actually starting it. Shorais are pretty popular because theyre light and have high cca so before you rule out the battery i would check to see if it is a lithium one.