I JUST bought the coleman mini led headlamp and i don't know how the batteries are supposed to go in. the back will not open and there were NO instructions.

Maureen, Coleman Graphite Flashlight replace batteries. Remove bottom cap, it will be on tight, if you do not have good strength in your hands use a pair of pliers or channel locks. Check the attached links,instruction and guides, Good luck
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How to change the batteries in Mag Lite

William, went to Coleman site, looks like you remove screws on bottom of lantern to access and change battery.
Check the attached links to your manual,
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http://r1.coleman.com/Manuals/5327.pdf

Rugged Rechargeable Family Size Lantern

Coleman Rugged Rechargeable Lantern Replacement Parts Flashlights...

Battery Buyer Batterybuyer com

Not that I know of- they are usually 2 AAs. The 1 AAA keychain model was terrible in that the "turn to on" function was intermittent so I could never trust it. Tried WD40, sanding the contacts, etc. This was the old halogen version.

there are two threadings one for the lens and one for the bulb, try again

Many flashlights will have a threaded cap opposite the lenses side that will unscrew providing access to the battery storage compartment.

Pull on the back piece where the strap attaches. Straight out. It appears! Do the opposite to get it back on. Make sure it's on securely or the batteries will shift out of position and you will be left in the dark.

You don't remove the screws!!! Use the plastic 'key' that is in the headstrap to remove the cover (opposite side of the headlamp from the switch). Then shake the headlamp to allow the battery cartridge to slide out.

Make SURE you have the batteries in the right way. If you have a battery turned around it won't work, plus you will likely bend the spring inside and then be unable to get the battery in the right way.

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.

In the headstrap is a plastic 'key' that you use to remove the battery cover (opposite side of the headlamp from the switch). Once you remove the cover, you can shake the headlamp to let the battery cartridge slide out of the headlamp.
Pay close attention to which way the batteries go in--if you put a battery in the wrong way you can easily bend the springs inside!