The Gallagher B40 is a robust 12V battery-powered electric fence energizer, part number 386317, designed for effective livestock containment on fences up to 3 km. This energizer features a maximum output voltage of 9000 V, a charging energy of 0.4 J, and a maximum impulse energy of 0.28 J. It includes a battery saving mode and built-in lightning protection, ensuring reliable performance and longevity. Easy to install and move, the B40 is suitable for small fences with minimal vegetation. It requires one earth stake and can power up to two electric nets. The unit weighs 1.7 kg and measures 200 mm in length, 160 mm in width, and 100 mm in height.