Vacuum pump accesory: NAVAC NB1 rechargeable battery is used to power the NAVAC NP2DLM Cordless Vacuum Pump. Reliable battery pack: A powerful lithium-ion battery with 18V 5Ah 90Wh power output. Latest technology: Features a USB Output for convenience and ease of use. Built-in gauge: The NB1 is designed with a battery life indicator to make sure you know when it’s time for a recharge. Encouraging smart work: We want your NAVAC NBP2 Battery Pack to last as long as it can, which is why we are offering a 2-year warranty. NAVAC always wants to empower you to work smarter!