Are there different sizes of hearing aid batteries and what are they?

Yes, there are 5 different standard hearing aid batteries. Here are the different types, associated with a number, and there color code. Blue number 675, orange 13, magenta 312, yellow 10 and red 5. If you are having a question about your specific hearing aid I suggest you contact your hearing aid retailer to get the specific since there are a large variety of different hearing aids.