SSM6N951L/SSM10N954L Field Effect Transistors Toshiba SSM6N951L/SSM10N954L Field Effect Transistors promote high-efficiency charging/discharging in small cell batteries. Improving a battery’s reliability with low thermal impact is a key requirement for Li-ion batteries adopting fast charging. MOSFETs are generally used in the charge/discharge protection circuit as a switch and are often built into a Li-ion battery pack.