My first ride

I managed to mount the motor on the bike so I was ready to get key in and try it ! So I went outside, put the batteries in and then it worked ! But only for a few feet. After 1 second or two the power would cut off. I was not sure at that time what was the problem, so instead of dismantling the bike again, I just plugged in the charger. After about an hour charging the bike, I went outside for a second test...and it worked ! I was able to ride a bit around the house. So I plugged it in again, for about another hour.