When using Halo or Re-Loader hoppers a couple of rules apply.
Do not over fill, the balls need to be able to move around inside the loader or you will get a jam.
When changing batteries :
Firstly DO NOT use cheap batteries, use good alkaline cells not cheap supermarket or value batteries.
Secondly be careful not to tug on the connectors or you will un-plug the connector.
Thirdly be careful not to "pinch" any wires as that will cost you a new wiring loom.
Laters