The 7.2V nimh battery pack charger is designed to be used with battery pack of size around 2200mAH at 9V regulated charging voltage. The battery charger aa aaa 9V is a sophisticated compact external smart charger that enables accurate monitoring and charging, employing a software controlled algorithm to optimize battery performance. The nimh 9V battery charger detects charge states by utilizing Negative Delta V detection and pulse charging and cuts off current when batteries are full. The 9V nimh battery charger is equipped with interchangeable plugs to be used all around the world.