Like most coin batteries, the CR2430 is marked by its flat, round design and its thin profile. Simply put, it's shaped like a coin. For the electronics industry, coin batteries are particularly important. Many smaller devices will require a battery that is extremely thin and doesn't interfere with the rest of the design. Sometimes, this just isn't possible with cylindrical batteries like AA or AAA batteries. But with a coin battery like a CR2430, fewer adjustments need to be made to a device's design overall.
Security sensors that use coin batteries like the CR2430 are usually small and unobtrusive. But since the CR2430 batteries are wider, they cannot be used interchangeably with CR2025 and CR2032 batteries. However, CR2025 and CR2032 batteries can sometimes be used in place of each other, even though CR2025 batteries are slightly thinner. There is no true substitute for a CR2430 battery, and they represent a somewhat unique size in the battery world.
In the security industry, CR2430 batteries aren't super common, but they are used from time to time. The sensors that use them are known for being quite small in size. In fact, CR2430 batteries are regularly used in key fobs that cannot contain cylindrical or rectangular batteries. The Honeywell 5804BD and the Honeywell5804BDV are two key fob devices from Honeywell that both use the CR2430 battery. Interestingly, these key fobs both require two CR2430 batteries in order to remain powered. However, these Honeywell Key Fob devices have been discontinued, and they are rarely used today.