With this fast GP battery charger, your batteries will be fully charged again after only 6 hours. You can charge 2 or 4 AA or AAA batteries at the same time. The PB570 stops charging once the batteries are fully charged. This way, your batteries are protected against overcharging and it'll increase the battery life. 4 2,600mAh AA batteries are included with the charger, these are both powerful and hold their charge long.