Mix charge the battery Reverse protection Precision end-of-charge voltage detection Auto active function for Lithium battery cell open (0 Voltage) 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 cell 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