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The Protexus Professional 16.8 Volt Gen 2 Battery is a lithium-ion replacement battery for the Protexus Handheld Electrostatic Sprayer or the Protexus Backpack Electrostatic Sprayer. Select between a 4-Hour Battery (PX20A) or 8-Hour Battery (PX20B) for longer runtime. These Protexus Professional 16.8 Volt Gen 2 Batteries have a 1- 2 hour charge time and can be recharged 800+ times.