A simple mini LED flashlight is made up of LEDs, resistors and batteries. In some cases, batteries are not required, and a resistor. This lamp is less effective than the more complex, for example, a compact Fenix flashlight or Skyray flashlight, equipped with a converter, but the low price and the speed of the assembly are paying for this deficiency.
If you do not know the color of light LED, briefly connect it to the lithium battery sizes 2016, 2025 and 2032. At the same time you will know the polarity of the LED pins, trying to connect it both ways. An element marking applied to the positive electrode, having a larger size. LEDs having a body (i.e., not performed in SMD-performance), to such a battery can be connected without a resistor. In no case do not short-circuit element.
If the LED power supply, having a housing, you are going to use a lithium-size element of the 2016, 2025 or 2032, or three in series subminiature manganese-zinc cell size LR41 (L736, AG3), the resistor cannot be used. To power from the same power supply SMD-diodes recommended resistor of 30 ohms. When using the three elements of the brand AG13 (LR44) the same resistor will have to put in series with the case and LED.
Sometimes, in the lamp for industrial power blue or white LEDs include two batteries in series in 2016 without a resistor. Doing so is impossible, because it would lead to a rapid deterioration of the diode and the discharge element.
Light-emitting diodes require compliance when connecting a number of rules regarding the polarity, current limit and protection against voltage spikes. Neglect of these rules leads to premature or even instantaneous failure of the device.
Always turn on the LEDs only in straight polarity. Some of them fail even when applying a relatively small reverse voltage. There are, however, and these LEDs, which are able to exhibit the properties of the diode when applying reverse voltage (not to be confused with the properties that they possess when applying forward voltage).
To protect the LEDs from voltage spikes in those circuits where possible, connect each of them in parallel in reverse polarity voltage of 6V. This diode to protect against voltage spikes of either polarity, and at the same time, it will not be bridged, and thus did not affect its operation.
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