A split charge diode is an electronic device used to enable simultaneous charging of multiple batteries from one power source. It does this by preventing current from flowing from one battery to another while allowing the batteries to be connected continuously. 

Sterling has developed a split charge diode that has enhanced performance over conventional diode and at a lower cost. The difference in performance coming from the diodes, other split charge diodes use conventional alternator diodes, which at low current flow have about a 0.93 voltage drop. When the full rated current of these diodes is approached, the voltage drop increases to about 0.95 volts. This results in excessive heat and power loss across the diode.