X2 2-Pack 20 Volt Max 2.5Ah Lithium-Ion - Black

The SENIX S2K0B2-02 20 Volt Max 2.5 Ah lithium-ion battery provides "fade-free", "memory-free" power to all SENIX X2 cordless tool models. 20 Volt Max battery, maximum initial battery voltage (measured without a workload) is 20 volts. The nominal voltage is 18