If, along with the switch, there is something else within the circuit, such as a light bulb, the bulb will gentle from the friction of the electrons transferring via it. The software, toy, or electronic product typically specifies which battery kind must be used to power it. Anything that makes sounds, lights up, or activates with out being plugged in accommodates a battery. Batteries contain toxic metals, such as lead, cadmium and lithium that might be released into the setting when disposed of the wrong means. While you probably will not damage your telephone through the use of the flashlight for long intervals of time, we suggest not leaving it on any longer than needed.