The Hyundai BI20-4 is a 20V 4Ah lithium-ion battery designed for Hyundai’s second-generation range of 20V cordless garden and power tools. Offering reliable performance and extended runtime, it is an ideal spare or replacement battery for compatible Hyundai tools. The integrated LED power indicator provides a quick overview of the battery level, while the intelligent communication system keeps you informed about the battery status in real time.