9V Battery
A 9V battery is a type of battery commonly used to power small electronic devices. It has a rectangular shape and provides a voltage of 9 volts, making it suitable for devices like smoke detectors, remote controls, and some toys.
These batteries come in various chemistries, including alkaline, lithium, and rechargeable nickel-metal hydride (NiMH). The 9V battery is popular due to its compact size and ability to deliver a relatively high amount of power for its dimensions, making it a versatile choice for many household and portable applications.