Battery
— the power supply that is initially supplied with the flashlight and allows you to use it right out of the box. It can be either a rechargeable element or a disposable battery; such details should be clarified separately.Anyway, the main advantage of such a configuration is obvious: there is no need to spend time and money on purchasing a separately sold energy source. At the same time, we note that the configuration without a battery / battery also has its advantages: at least it allows you to choose a battery at your discretion, and in some cases even do without unnecessary costs. Conversely, the presence of a battery is not always an advantage (for more details, see "Battery type — branded battery").
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