Replacement battery fits 5 Kawasaki compatible models. Specifications: 3500mAh, 3.6V, Li-ion. Compatible with: Nachi Robotic Systems SB100, Nachi Robotic Systems SRA100, Nachi Robotic Systems SRA133L, Nachi Robotic Systems ST166, MD500N. Replaces: Nachi Robotic Systems 50750-1018, Kawasaki 50750-1018. Kawasaki replacement battery designed for PLC devices. Fits like the original manufacturer part.