Rectangular batteries are often referred to as 9V batteries or sometimes as "block batteries." Their unique rectangular shape makes them easy to spot, and they're commonly used in devices like smoke detectors, guitar pedals, and some medical equipment. While 9V is the most recognized rectangular battery, there are other shapes and sizes, so it's always a good idea to check your device's requirements before purchasing. If you're shopping at Walmart, you can filter by battery shape or voltage to find the right fit for your needs.

The rectangular shape of 9V batteries is designed for convenience and compatibility with certain devices. This shape allows for a compact arrangement of cells inside the battery, providing a higher voltage in a small package. The flat sides make it easy to fit into battery compartments found in smoke alarms, radios, and other electronics. While the shape isn't necessary for all devices, it helps ensure a secure connection and saves space in products where a cylindrical battery wouldn't fit as well.

Blocky, or rectangular, batteries like the 9V type are commonly used in devices that require a higher voltage or a compact power source.

• Smoke detectors
• Portable radios
• Guitar pedals
• Wireless microphones
• Some toys and medical devices

There are several common types of household batteries, each with its own uses:

1. AA batteries – Used in remote controls, toys, and flashlights.
2. AAA batteries – Found in smaller electronics like remotes and clocks.
3. 9V batteries – Popular in smoke alarms and certain audio devices.
4. Button cell batteries – Used in watches, calculators, and hearing aids.

Choosing the right rectangular battery depends on your device's requirements.

• Check the voltage—most rectangular batteries are 9V, but always confirm with your device manual.
• Look at the battery compartment for size and connector type.
• Decide between single-use (alkaline) or rechargeable options based on how often you use the device.
• Consider shelf life if you're buying in bulk or for emergency use.