Hahnel use only the most modern battery technology to make our Lithium Ion batteries. They feature a high energy density, have no memory effect and are produced to the highest quality standards. A built-in microprocessor safeguards the cells by limiting maximum voltage and by protecting against deep discharge, short circuit and overload. Features: Milliamp ere - 600mAh Volts – 3.7V Watt – 2.2Wh Compatibility: The Hahnel HL-CA120 Li-Ion Battery is a replacement for the Casio NP-120.