This RYOBI 40V 4.0 Ah Lithium-Ion Battery (Model OP4040A1) delivers fade-free power and up to 2X more runtime than standard 2.0 Ah compact batteries. Compatible with all RYOBI 40V tools and chargers, it features an integrated on-board fuel gauge to monitor remaining charge. Part of the RYOBI 40V system, this high-capacity battery is designed for demanding outdoor power equipment and provides consistent performance until the end of the discharge cycle

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