BR1811 is designed for quick, hassle-free use with a quick-change parabolic squeegee system that delivers 100 percent solution recovery and has an 11-gallon solution tank for large jobs. It's ideal for any flat surface floor, including quarry tile, paver bricks and raised rubber disc flooring. This model comes standard with wet-acid batteries and a charger. Unlike the BD 20/11, the BR18/11 features a smaller cleaning path (18 inches wide versus the BD 20/11's 20-inch wide path).