Alternators are just like car alternators, they are meant to maintain your battery, not charge it, it is especially bad on motorcycles. Pull the batter and charge it for a few hours, then take it to your local parts store and have them test it.
-2001 Jincheng Panda(Honda Clone)
-1985 ATC70 with 125cc motor
-1973 CT70 with 125cc motor