ive got an 07 rancher 420 and a few months ago i had a battery die and it wouldnt stay charged long enough to work right so i went and purchased a new one. i went on one ride and killed the bike 5 or 6 times then one time it wouldnt crank at all so i got a jump off from a friend and i made it about a half a mile and it died again. we did this about 10 times until we finally made it back to the truck. but if the battery was brand new and just randomly died i was wondering if it would be my regulator or stator thats bad. also if i gave my old battery a full charge it would last about 3 hours before dying again.