Is it even safe to weld an alkaline battery? I don&#x27;t know.<p>Why not just solder the contact? If it&#x27;s soldered, you should be able to swap the battery with a soldering iron. Sure, heating the iron and cleaning it will take much more time than swapping a battery in a spring-loaded housing, but I&#x27;ve spent just as long opening battery compartments held shut with tiny stripped screws.