rectifier regulator problem

[krueg43]

ok so i bought a gz250 froma gentleman who said that the rectifier regulator was bad on the bike, well i have the part coming in the mail but i also went ahead an replaced the battery i started up the bike the first couple times it would take forever to start and then finally did so i took it out for a ride, and of course it died not even a 1/4 of a mile later, i did it twice. so today i filled up the gas tank cos the gas station was by my house i realized i was going to late for work, i had to take the bike cos its my only transportation at the moment, but the thing is i made it all the way to work with out the bike dying which boggles my mind, its still got the same new battery in it i put in the other day that died out after a 1/4 of a mile, i work 8 miles from my house and all i did was put fresh gas in it. anyone have any idea if it was just a gas problem?