9V battery

The 9V block battery, also known simply as a 9V cell, is a compact, rectangular-shaped battery featuring connectors on one side. Its name comes from its internal structure, which typically contains six 1.5V cells connected in series, providing a total of 9 volts.
These batteries are available in different electrochemical systems, such as alkaline, lithium, or rechargeable Ni-MH, offering various capacities and use cases.
The 9V block batteries are commonly used in smoke detectors, radios, electronic devices, testers, instruments, and measuring equipment.
Their main advantage is that they deliver a high voltage despite their small size, making them suitable for devices where multiple smaller cells cannot be installed. However, under high current demand, 9V blocks may have limited load capacity, so selecting the proper type is important.