Found in the mount folder are battery holders which are designed to just hold the battery securely.
There is a blank version which you can use to make you own custom version and two examples:
Found in the adapters folder are the holders designed for interfacing with the batteries. These adapters are made to use the Makita 644808 8 battery connector.
There is a blank version which you can use to make you own custom version and two examples:
The author hasn't provided the model origin yet.