This custom 3D-printed adapter connects an Einhell 18V battery connector (available on eBay) to the Multiboard modular system, allowing you to use your existing Einhell Power X-Change batteries as both a stable base and power source for Multiboard-compatible modules. The adapter works in conjunction with a commercially available Einhell battery connector that you purchase separately from eBay, then securely mounts using M4 x 8 screws and nuts to provide both mechanical stability and electrical connection. Perfect for makers who want to integrate their existing Einhell battery ecosystem into mobile soldering stations, portable electronics workbenches, or modular workshop organization systems.