With a 20V electrical potential and 4 amperage supply per hour, Ronix 8991 lithium battery is the ultimate interchangeable source of power for all 89 series of cordless tools. It’s lightweight and compact design makes it user-friendly and its immunity to memory effect and self-discharge ensures maximum productivity and less downtime. Scroll down to learn more… Features 4 Ah battery charges quickly and provides consistent power to every 20 V Ronix lasting series tools No memory and virtually no self-discharge for maximum productivity and less downtime LED battery indicator allows immediate feedback on state of charge Lightweight compact design for ease of use Compact Lithium Ion pack provides longer run-time than standard 20V battery packs Specification Supplied in: Ronix Color Box Model: 8991 Battery Type: Lithium-ion Battery Voltage: 20V Battery Capacity: 4000mAh charging time: "120min (with 2A charger) 60min(with 4Acharger)" Weight: 626gr packaging: Color box