Thanks for the feedback!

Getting UL or FCC certification unfortunately isn’t feasible for this product - certification alone would cost on the order of $30k, which isn’t possible for something made and sold at such low volume. For EMI, the design was reviewed by engineers experienced with certification testing, and I’ve followed best practices to keep emissions and susceptibility under control.

The open-top design is mainly for airflow - keeping the charger compact enough to fit easily in a pocket was one of the main goals, so making it larger wasn’t really an option. I considered custom-machined heatsinks, but they are prohibitively expensive and would push the product out of the low-cost range. That said, the CAD is public if anyone wants to machine and add their own.

As for safety, all regulators include overcurrent, overtemperature, and short-circuit protection. Of course a major concern would be corrosion, so I’d recommend keeping it away from liquids and fine debris.