my hp probook 6455b has a good battery and occasionally charges but not very often. It never powers off when it's running just off the charger without the battery. But like i said it hardly ever charges it... I am also using a dell charger so idk if that is the problem or what.... I just dont see why it would charge sometimes and but not all the time or never... just when it feels like it.. help would be appreciated, I just dont want to buy a charger and the battery be the problem or vise versa.