Flashlight that can operate with alternative size batteries

Provided with each of examples implementation of flashlight. With a representative embodiments, the flashlight (100) comprises a light source and outer shell (102) and at least two position battery (204,206) in the housing. The battery position in the housing capable at least two battery (104,106) is at least; each battery is provided with different size. Flashlight further - comprising electromechanical structure (316), which is arranged at least two battery with different size with other, the electromechanical structure for preventing the battery electrically connected with the closed circuit is light source.