New replacement 18V 90W battery suitable for Ridgid 18V lithium battery models R840087, R840083, R840085, R840086, AC840089, AC840085, AC840086, AC840087P. Compatible with Ridgid 18V lithium system and R86092 charger. High capacity 6.0Ah lithium battery with over 500 cycle times. Features on-board fuel gauge and LED battery charge level indicator. Integrated microchip prevents overcharging and self-discharge.