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.
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.
Safety information
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.
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