What is the voltage of the LED rechargeable flashlight?
Usually 4V, 4V is ok. Don't use it above 4V!
15266 is also the 3.6V in general, these can not be MP4 when the external power supply. 18650, CR123A, 18500, and 15266 are battery models.
Does your flashlight come with batteries? The battery has AA (AAA), these are 1.2V or 1.5V, and the 18650 battery is 3.7V.CR123A, 3.0V or 3.6V, and 18500 is 3.7.
