If this is an alkaline battery, it may be stuck due to corrosion. I would carefully slide a solution of liquid soap and water going a little heavier on the soap. Dial soap is perfect, and let it sit for 24 hours. The batteries should slide right out. Try it
You may have to drill a hole in the batt and pull it out. Probably has acid leak on top of it, and the batt. expanded. Seen this once with a Tape recorder and used a wirehook to get it out. It aint easy, but it can be done and not hurt the light.
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Since batteries and bulbs are new/ok, check for a bad connection. In older version using 4 lantern batteries, open the battery compartment by unscrewing the knob on top of lantern. The lantern bottom comes off once unscrewed (of course you did this to change batteries). There is a "C" clip on the lantern center shaft; remove this by prying with screwdriver or with pliers. Carefully raise the battery contact plate and check slip-on wire connections. Clean as needed (Scotch-Brite works well) and reconnect. Squirt some contact cleaner in exposed switches, work switches back and forth. Inspect circuit board for obvious corrosion or damaged parts (this damage may "total" the lantern). Re-install plate aligning grooves with ribs. Install batteries and test.
The bottom unscrews.When you get the bottom open,screw the top(where the lightbulb is) down further.Hold the flaslight almost sideways and slide the batteries in,then turn the flashlight back up so as not to let the batteries slam.The little positive nipple goes in first for both batteries.After you screw in the bottom,then you can adjust the top end for proper usage/operation.Greg
If it is the same as the Coleman headlamp I just bought, it claims to have a "easy slide out battery cartridge" On the strap there is a plastic key to unscrew the lid where the batteries are but this doesn't allow you to access them. When you bang the entire thing in your hand to make the cartridge slide out it may not come at first because it is stuck. I partially unscrewed one of the tiny screws on the top of the battery cartridge and pulled on it. This caused it to slide out of the headlamp and I could load it with batteries. I then rescrewed it in gently as its kind of fragile. After this I could get the cartridge in and out by simply tapping the light in my hand with the lid off. The light works great now. Since the screwdriver is so tiny that you need to do this, see if you have a eye-glass repair kit lying around. It may have the size you need.
The back, tail cap, should be unscrewed from the maglite to replace the batteries. It can be pretty hard to open as they are generally not opened very often and there's a rubber seal to keep it water-proof. You could try using a pliers or vice but be careful not to squeeze it out of shape.
There's also a possibility that if the batteries are in it a long time that they have leaked and the leaked chemicals have sealed it. If this is the case you may be able to get the maglite replaced depending on what brand of batteries were in it. Maglite have an agreement with the makers of Duracell, Ever-Ready and Ray-O-Vac to replace the Maglite if one of their batteries leak in it.
Unscrew both ends and spray WD40 or a similar lubricant around the edges of the battery and allow it to penetrate all the way around. Afterward, try tapping around the area where the battery is to loosen it up. Then try shaking it in a up/down motion.
Unscrew the bottom portion, where the batteries go. Then unsrew the top where you can adjust the beam width until it comes off. Very carefully pull the bulb out and replace the old bulb with the new. The Reassemble is the reverse of the procedure.
1. Unscrew the "bell" (top) of the flashlite. 2. Remove the bulb by pulling upward. 3. Replace with new bulb (be sure you have the correct bulb . . . it will have two small wires protruding from the bottom). 4. CAREFULLY insert new bulb through hole in the bottom of the reflector. 5. Screw the top of the flashlight back on.