ESR441 is a high quality regulator/rectifier that is used on various Yamaha and Suzuki ATV models. Our ESR441 is small but packs a lot of punch: our latest generation power electronics and a highly efficient heat sink allow for cool running and excellent power characteristics and it far outperforms the similar sized OEM regulator it replaces. ESR441 output voltage is very stable which provides for a perfect charge rate for the battery, and it runs extremely cool due to the advanced circuit design. ElectroSport's ESR441 is supplied with a full one year warranty.