Like many common wireless garage door opener remotes, Genie's basic three-button and one-button remotes rely on a single 3-V 2032 lithium coin-cell battery. To replace the battery, open the remote's case by inserting a coin into the slot on top of the device and using it to pry off the battery compartment cover. Remove the old battery and insert a fresh one, referring to the symbols in the compartment for proper polarity placement. Usually, the positive side of the battery -- marked with a plus sign -- faces up.
Genie's Closed Confirmed remotes, which work with the Genie Network Adapter to deliver visual and aural confirmation when your garage door closes, require regular AAA alkaline batteries. To swap them out, simply slide off the battery cover, remove the old batteries, and align the new ones with the positive and negative polarity symbols.
Intellicode wireless keypads also run on AA or AAA alkalines, and replacing them is also a simple slide-off, pop-in process. You'll know what type you need when you open the compartment; take a look at the old batteries or the size of the battery slot to know which type to get.
The three-button remotes that work with Genie's line of Intellicode products use a special type of alkaline battery known as an A23, commonly used in alarm, keyless entry and security devices. You can track these down at most hardware stores, and changing them out is just like changing AAA batteries; slide off the remote's cover and pop the new one in, ensuring that it's aligned according to the polarity symbols.