A 9-volt battery is a household battery more powerful than the typical 1.5- or 1.2-volt battery. It is a rectangular body with the positive and negative terminals side by side at one end. A 9-volt battery is actually made up of six 1.5-volt batteries arranged in a six-pack and connected in a series.
A 9-volt battery is used in electronic devices requiring a higher voltage but little current such as metal detectors, R/C toy controllers, and walkie-talkies. These devices work by creating electromagnetic fields that use voltage more than current.
Types of 9 Volt Batteries
Kinds of 9 Volt Batteries include the following:
A carbon zinc battery has an anode of zinc, a cathode of magnesium oxide, and a slightly acidic electrolyte.
It is used in devices requiring light to moderate drain.
A zinc chloride battery is a carbon zinc battery with a slightly acidic electrolyte.
An alkaline 9-volt battery has a higher energy density and longer shelf life than a carbon or zinc battery.
They are commonly used for portable digital electronics like MP3 players and handheld video games.
Choosing 9 Volt Batteries (Buying tips)
Rechargeable: For practicality, choose a rechargeable 9-volt battery that allows you to reuse it.
Long-life: For long-life, choose an alkaline 9-volt battery, which is the best in the market so far.
Do not fuse two 9-volt batteries together to prevent them from short-circuiting and producing a lot of heat. The batteries can spark and leak if left for long.