Long-lasting for hours of pleasure, these LR54 batteries are an essential for many of our smaller toys (including cock rings and bullets). Each pack contains 2 batteries to keep the fun coming night after night. LR54 batteries have lots of different names, but they are all the same battery. They are also known as: AG10, LR1130, LR1131, 189, 387, 389, 390. We always call them LR54 on Lovehoney.