The LR44 battery and AG13 battery are exactly the same dimensions and are 100% interchangeable. They are known as many other names and are compatible with their silver oxide counterparts.
Dog Collar Batteries
4LR44 Dog Collar Batteries 4LR44 batteries are made to a height of 25mm and a diameter of 13mm. They have an average capacity of 160mAh whereas the name brand energizer