How do you replace battery on coleman 2000001573 led flashlight?

small lights like this unscrew the end to get battery out

As far as the missing part, you can probably go to the manufacturers site and find one. You may find it on E-Bay. The one large vs 8 D cells is an easy one. I have lights that use either. Some lights come with an extra part that looks like a large battery but is actually a holder for 8 d cells that will replace the large battery.

To my knowledge all you have to do is screw off the lid at the back and replace the batteries some of these flashlights comes with a charger some doesn't

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

In order for someone to help. We need more information, the manufacture name, the exact model number. Usually found somewhere on the device. That model number has to be the longest model I've ever seen. Maybe the LED is bad.

I scratched up my flashlight to figure out how to open and get into a "Battery Lock" style light to replace batteries. Take two pliers, pinch one on the middle section & the other at the tip. Torque hard left as if you are "locking the battery" as advertised. Once it passes a certain area, the tip will come out. Very poor design. Coleman should have made grooves so pliers can easily grip instead of scratching the heck out of the aluminum. Now mine is ugly and could scratch my hand. Even used a towel to grip but still damaged light. Have to now sand down the damaged parts. Not very smart designers. I am Asian, pretty sure this was made in China.

Really? Put the flashlight down and slowly step away from it and if that doesn't work threaten it with a hammer?
Seriously did you read the package directions? The pointy end with the gray ring is the end most likely screws off to put the AA batteries in.

I replaced the battery in mine(coleman powermate) for 10 bucks but you have to be careful in how you disassemble it and put it back together. Batteries sulfate after awhile like a car battery.

TO INSTALL OR REPLACE BATTERIES

1. Rotate body of headlamp until lights are pointing down and battery cover tab is to the front.
2. Insert edge of buckle on headband or a coin under tab and twist to unlock and remove battery cover.
3. Install 3 "AAA" cell batteries in the correct orientation as shown on the battery housing. Make certain all 3 batteries are installed
correctly.
4. Replace battery cover by first inserting the tabs on the back of the battery cover under the back edge of the battery housing, and
then rotate down until battery cover snaps into locked position.

For the manual: http://www.coleman.com/coleman/images/pdf/4343-704.pdf

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.