I'm having the same issue trying to find a replacement part, no luck so far.
To make mine work I just took some stripped copper speaker wire, coiled it up and used that to both secure the batteries and provide the appropriate contact to make it work.
Additionally I have heard someone using a 5/8" bolt:
''Go to Your favorite hardware store's, Hardware Section, your looking for their 2" long, 5/8" thick Hex Screws probably at the bottom with other larger screws. should cost $1. 9/16" is the technical width of the apple battery cap, great size choice apple, but 5/8" screw works for my solution.
Tinfoil about 1"x3" wide strip fold up enough so it will fit inside battery compartment.
Put in the 3 batteries flat side up, put the piece of tinfoil on the last battery, screw in the hex screw till its snug, press power, you have a working bluetooth keyboard. (Looks frankensteinesque) So if you have a metal saw, you could trim it down a bit and make your own more ergonomic caps.
Until I get a metal saw, Im working with this: (see picture)
I had the same problem. I bought a 5/8" hex bolt at Home Depot for 95-cents. I used a SawsAll to cut off the excess material, and make the plug shorter. I used hockey stick tape to cover the outside of the plug (cover the sharp edge and threads). Works perfectly!
or simply order from china via ebay $2 a piece =)
I was able to get one of the covers for the newer keyboards and touch mouse. If you fold up a piece of tinfoil and put it on the last battery, you can easily cross thread the newer battery plug tight enough so it will stay.
Tim Graham 의
Two ingredients (or even just one):
1. A metal screw/nail
- the screw/nail has two parts. The upper part is round and like a ring, while the lower part is like a long narrow tail. You want to find a screw with an upper part in the same size as your lost battery cap and can be inserted inside the battery compartment hole with minimal gaps/spaces left
- it's fine if you cannot actually screw the "ring" into the hole. Check that when you push the screw hard against the battery (you need to test your screw by having batteries inside the compartment), and you press the keyboard switch-on button, the keyboard light goes on. When you release your hand, the screw no longer touches the battery so keyboard would switch off
2. Aluminum /Tin Foil
Next, we need tin foil. Cut up small strips and place them between the battery and the screw "ring". Turn the screw (add more foil as needed) until "ring" has descended into the compartment hole and stays in contact with the battery even after you release your hand.
Sonia Chan 의
Or, 3d print this, and add a layer of metal foil.
Bryan Kentner 의