Amazon.com: BlueDot Trading Single Pack 2CR1/3N or DL1/3N or CR11108 Lithium Manganese Dioxide Cell Battery 3V for Dog Collar, cameras, calculators, and more, Quantity 1 : Health & Household
Amazon.com: BlueDot Trading Single Pack 2CR1/3N Lithium Cell Replacement Battery 6.0V Low-Power Consumption for Dog Collar, Cameras, Calculators, Keyless Entry, and More : Automotive
L544 6 Volt Lithium Battery (28L, PX28l & 2CR1/3N)