Compatibility: Direct replacement battery for LG CordZero models R87, BDV1, R9, and R9MASTER. Compatible part numbers: EAC63419402, EAC63419403, EAC63419404. Key specifications: Rechargeable lithiumion battery, 21.6V nominal voltage, 5200mAh capacity. Why you need this battery Restores and maintains strong suction: quality lithium cells transfer energy efficiently to the vacuum motor, helping recover suction power and improving cleaning performance compared with a worn battery. Longer run times and fewer battery changes: 5200mAh capacity and a longer cycle life mean more cleaning per charge and less frequent battery replacement. Energy efficient operation: Efficient cell chemistry delivers more usable power to the motor, improving cleaning results without wasting energy. What makes it stand out performance lithiumion cells for stable output under load. Designed to match the original LG CordZero specifications for reliable fit and function. Rechargeable and reusable—keeps your cordless vacuum working like without replacing the entire machine. Practical features Plugandplay replacement for the original battery pack (matches LG CordZero battery compartment and connectors). Durable construction suitable for repeated charging cycles. Suited for routine cleaning, spot cleaning, and extended cleaning tasks where consistent motor power is required. Typical use scenarios Home deep cleaning: an aging battery to regain full suction for thorough wholehome cleaning sessions. Pet hair and traffic areas: More consistent power helps pull pet hair and embedded dirt from carpets and upholstery. Multiroom or extended runs: Higher capacity supports longer runtimes when cleaning several rooms or large apartments without frequent recharging. What's included One 21.6V 5200mAh rechargeable lithiumion battery compatible with LG CordZero R87, BDV1, R9, R9MASTER (EAC63419402 / EAC63419403 / EAC63419404). Notes Designed to match original LG CordZero specifications for voltage, capacity, and fit. Follow your vacuum manufacturer's instructions for safe installation, charging, and disposal of lithiumion batteries.