A: This battery has those dimensions.
A: The 21/23 battery has this size as shown in the two pictures. If your product calls for 21/23 then why worry about the dimensions? It should be fine for your application.
A: I just measured my battery and that is the size you mention.
A: The battery is 6/16" inches in diameter. So if you measured it correctly this battery is too small. I would take your battery to Home Depot and get a staff person to help you get the correct battery.
A: 3/8" as shown in the picture.
A: They are all 12V batteries. You need to buy what is recommended for your product because each one may be different in size and may not fit in your device.
A: The battery is 1 2/16" long. I used my battery for my fan remote (a Harbor Breeze remote)
A: 1 3/16" long.
A: 1 1/16 inches
A: This battery is 1 1/16" long. I used it in a Harbor Breeze fan remote.
A: It is 1" long as shown in the picture.