With reverse protection; Precision end-of-charge voltage detection; Auto active function for Lithium battery cell; Automatic 3.7V / 1.2V 7.2V / 8.4V battery cell voltage and polarity detection; Press the button select LiFePO4 batteries; Floating-charge maintains battery in full charge; LCD displays multi-information battery type voltage time charging percentage charging capacity worse battery and bad battery; Metal plates for charging connection can easy adjust for many different type battery cells; Over charging timeout protection; Auto alert indication for worse battery cell and bad battery cell; Power input can use DC 12V or mini USB DC 5V for charging or DC 6V Photo voltaic solar panel