To my knowledge this item has been discontinued by Coleman and is no longer available. However, I've listed basic instructions on changing batteries. Here's a link that you could watch for the disassembly for your flashlight type.
high power flashlight ct-50 (youtube.com)
Locate the battery compartment on the Coleman CT 50 flashlight. This is usually at one end of the flashlight and is secured with a cap or cover.
Depending on the design, unscrew the cap or remove the cover to access the battery compartment. Some flashlights may have a twist-off cap, while others may have a sliding cover or other mechanisms.
If there are existing batteries in the compartment, carefully remove them. Pay attention to the orientation of the batteries, noting the positive (+) and negative (-) ends.
Insert new batteries into the compartment, ensuring they are placed in the correct orientation. Match the positive and negative ends with the markings inside the battery compartment.
Once the new batteries are in place, securely put back the cap or cover. If it's a screw-on cap, tighten it until it's snug. If it's a sliding cover, ensure it clicks into place.
Turn on the flashlight to check if the new batteries are working correctly. If the flashlight doesn't turn on, double-check the battery orientation and make sure the connections are clean.
If the old batteries are disposable, make sure to recycle them properly. Many communities have specific recycling programs for batteries.
Always refer to the user manual or any included instructions for your specific flashlight model, as the steps may vary. If you don't have the manual, you can often find it on the manufacturer's website or contact Coleman's customer support for assistance. Additionally, be mindful of the type and size of batteries recommended for the flashlight to ensure optimal performance.