RIDGID introduces the AC8609340SB 18V 4.0Ah MAX Output Starter Kit. MAX Output batteries facilitate battery and tool communication unleashing the full potential of any RIDGID 18V Brushless Tool providing more power and more runtime. The included RIDGID MAX Output 4.0Ah batteries will provide up to 3X more runtime and 2X more power compared to the 1.5Ah lithium-ion battery (AC870015). The RIDGID MAX Output 4.0Ah battery is compact and lightweight, which reduces user fatigue. Always be prepared for the job with the RIDGID 18V Lithium-Ion Charger. This compact charger features a smart charging indicator that will update the battery's charge status. For a more organized storage option, take advantage of the wall mount capability. Decrease energy consumption with this Energy Saving Charger and preserve your battery life with maintenance charging. As always, the RIDGID 18V 4.0Ah MAX Output Starter Kit is 100% compatible with all RIDGID 18V tools and chargers. Best of all, this kit is eligible for the Industry's Only Lifetime Service Agreement, simply register within 90 days of purchase for FREE Parts, FREE Service, For LIFE.