• The diminutive size of A23 batteries usually make them a better fit for small appliances.lithium battery on white image by Yasen Pramatarov from Fotolia.com
  
  Batteries come in many shapes and sizes and each type is used for diverse purposes. While AAA, AA, C and D are the standard battery sizes, you might not be familiar with A23 12-volt batteries. While there are many devices that require the more common battery sizes, an A23 battery has special uses.
  
  

Garage Door Openers

• A23 batteries are commonly found in automated garage door openers. The battery's small size means that the garage door opener also can be made small, making them a popular choice for manufacturers. The batteries also have a longer life than 3-volt batteries.
  
  

Digital Voice Recorders

• Digital voice recorders offer a convenient way to record and manage audio with enhanced quality. They usually are minuscule, making them a perfect match for A23 batteries.
  
  

Key Fobs

• Small accessories found on key chains, such as digital photo drives or keyless remote entry devices, are known as key fobs. They also require the use of an A23 battery.
  
  

Bluetooth Headsets

• Bluetooth headsets allow hands-free voice transmission to devices, most commonly cell phones. Some models use A23 batteries.
  
  

Acquiring 1.5-volt batteries

• You also could deconstruct certain brands of A23 12-volt batteries for pairs of 1.5-volt batteries. Wear rubber gloves while removing the outer covering of an A23 12-volt battery using a screwdriver to remove the 1.5-volt batteries packed inside.
  
  

Home Security Systems

• Home security systems use A23 batteries. With battery life important to these systems, A23 batteries are used because they can last up to three years.