Abstract: A flashlight includes a lamp support, an electric light-generating mechanism in the lamp support, a covering member around the lamp support, a barrel body joined on the covering member, and an adjustment member; the adjustment member is threadedly joined in the lamp support, and can be turned to adjust a position of a focal point of light emitted from a light source of the light-generating mechanism; front and rear heat-conducting components are positioned on front and rear ends of the light-generating mechanism respectively, and they contact the lamp support and the barrel body respectively; heat produced from functioning of the light-generating mechanism will be conducted away from the front heat-conducting component to the lamp support and from the rear heat-conducting component to the barrel body, and the light source is prevented from being damaged by the heat produced from it continuing shining for an extended length of time.

Abstract: A flashlight includes a body, a battery pack held in the body, a rear cover joined on the body, and a push-button switch in the rear cover; the push-button switch includes positive and negative electrodes, and a button part facing a through hole of the rear cover; the battery pack includes a casing, a battery set in the casing, and a socket facing a through hole of the casing; the battery pack includes positive and negative electrodes, which are connected to positive and negative electrodes of the socket; a first elastic component is positioned between and connected to the positive electrodes of the push-button switch and the battery pack; a second elastic component is positioned between and connected to the negative electrodes of the switch and the battery pack; the battery pack can be charged through a charger plugged in the socket while it is still held in the body.

Abstract: A flashlight includes a shell, a battery device held in the shell, a light emitting member installed on a front end of the shell, and a tail cap for the shell; the battery device includes a casing, and several single-part batteries held in the casing; the casing comprises two covering parts, which are joined together; the battery device further includes a socket on the casing; positive and negative poles of the battery device are exposed through front and rear ends of the casing respectively, and they are electrically connected with the sockets; a circuit board is secured in the tail cap, and electrically connected with the battery device; the circuit board has a built-in microcomputer controller to control power to the light emitting member; after a plug of a charger is inserted in the socket of the battery device, the batteries together will be charged through the charger.

Abstract: A battery device includes a battery set, and a casing; the casing includes a right covering part and a left covering part, which are joined together to provide a holding room for the battery set; the battery set include at least two batteries, and are held in the casing with positive and negative poles thereof being exposed through front and tail ends of the casing respectively; a socket is held in the casing, and electrically connected with the positive and the negative poles of the battery set; thus, after a plug of a charger is inserted in the socket, the single-part batteries together will be charged through the charger without the battery device being located on the charger.

Abstract: A flashlight includes a shell, a battery device held in the shell, a light emitting member installed on a front end of the shell, and a tail cap for the shell; the battery device includes a casing, and several single-part batteries held in the casing; the casing comprises two covering parts, which are joined together; the battery device further includes a socket on the casing; positive and negative poles of the battery device are exposed through front and rear ends of the casing respectively, and they are electrically connected with the sockets; a circuit board is secured in the tail cap, and electrically connected with the battery device; the circuit board has a built-in microcomputer controller to control power to the light emitting member; after a plug of a charger is inserted in the socket of the battery device, the batteries together will be charged through the charger.

Abstract: A flashlight includes a main body, a light source on a front end of the main body, batteries held in the main body, a bottom cover on a tail end of the main body, and a control device for controlling brightness and frequency of flashing of the light source; the control device is secured in the bottom cover, and electrically connected to the power source, and it includes a control switch sticking out through the bottom cover; the main body houses first and second conducting plates, which are connected to two poles of the battery respectively; the main body further houses a first elastic element positioned between and electrically connected to a positive pole terminal of the control device and the first conducting plate, and a second elastic element positioned between and electrically connected to a negative pole terminal of the control device and the second conducting plate.

Abstract: A flashlight includes a main part, a light source, a switch, an LCD display, and a control device; the control device will measure the electricity content of the batteries with a result of the measurement being shown on the LCD display; the length of time the batteries will last is also shown on the LCD display; the switch can be displaced to either one of several different positions, and the control device will make the light source produce light in a manner according to the position of the switch, e.g. flashing on and off repeatedly, and keeping on shining; in other words, the flashing frequency and brightness of the light source can be changed with the help of the switch and the control device; the LCD display will show information about the way the light source is producing light at the same time.