2cr1/3n Sanyo Fujitsu Collar Battery. Sanyo 2cr1/3n Batteries are now known as Fujitsu 2cr1/3n and are indentical internally, they remain in our opinion the best performing spray collar battery. Fujitsu 2cr1/3n Lithium Collar battery - Suitable for the following Dynavet Collars: Jetcare Pro, Masterplus, Aboistop and Jetcare Mini.