The Mac Tools Oil Resistant Batteries, Nos. MCBP520G, MCBP034G, MCB205G, are 20V MAX lithium-ion batteries built to deliver dependable performance in demanding jobsite conditions. Designed for durability, they help resist damage from oil, grease, and solvents with glass-filled nylon housings. Select models offer extended charge-cycle life for longer-lasting productivity, while 5.0Ah options provide reliable runtime for tough applications. They also feature compact, ergonomic designs that improve maneuverability in tight spaces.