I bought a miFlower. It asks for 1.5 volt batteries and in bracket it says that LR44, A76 and AG13 are acceptable. When I went to buy these, they were in different packets with different numbers written on them. LR44 was rated at 1.5 and AG13 was rated at 1.55. I am bit perplexed. The AG13 were nearly twice the price. I want to ask people about these batteries. Are these interchangeable? Will AG13 batteries last a bit longer and will give better performance? What is the difference between LR44 and AG13 batteries? I would be really glad if you can share some useful information with me. Thanks.