This project uses a charging circuit soldering to a Samsung 18650. All attached to a DPDT stomp switch. Long lifespan, and completely enclosed in case. The battery is hugged inside the casing and shielded with plastic to ensure it's not moving around. The charging circuit is mounted directly into the casing as well, all cables do have a plastic tunnel that they run through. Case clips itself closed. As of right now, the project is running standard LED's but I do want to run COB LED's in the final project.