
Installing batteries in your Vansky VS-FL03-V 51- UV Light Flashlight is simple. First, make sure you have the flashlight, the battery holder, and the back cover; note that batteries are sold separately. Next, put the AA batteries into the battery holder, making sure the negative (-) end of each battery faces the spring inside the holder. Insert the batteries one by one, ensuring the correct positive and negative orientation as indicated in the holder. After that, insert the battery holder into the flashlight's battery compartment, lining up the arrow on the holder with the direction indicated inside the compartment. Finally, secure the back cover by screwing it tightly onto the flashlight. For visual guides, and more details, please see the user manual.


