I picked up a used Myerchin lightknife on ebay that was missing its battery. I was unable to find anything online about what type battery or how to replace it so after I figured it out, I decided to post it here in case anyone else went looking.
It has the numbers 11177 stamped into the blade, and appears to be a model number LH300P (from the myerchin website).
The battery that fit for replacement is a CR1216
Step 1: Remove Belt Clip
Unscrew the three phillips head screws securing the belt clip.
This will expose the battery holder, foam compressor and plastic button. For reference the battery I used for this knife is a CR1216 (when I bought the knife it was missing the battery so I'm not positive if this is correct, but since I couldn't find the answer anywhere on the interwebs, I decided to make this instructable to help the next person who wonders the same thing)
Step 2: Insert Battery
You'll need to create a stack of the components in this order (starting from the bottom)
- First leg of the LED
- Battery with the + side face up
- Foam spacer
- Second leg of the LED (you may need to bend it up so it doesn't contact the battery when in the unpressed state (see picture))
- Plastic button
Step 3: Replace Battery Cover
Finally replace the belt clip/battery cover and secure the 3 screws.
If the LED lights up when you tighten the screws you'll need to disassamble and the bend the LED leg up a bit more.