Dell has had to recall certain versions of its portable charging device, the Hybrid Adapter + Power Bank, because of the risk of electric shock. Apparently, the casing of the black adapter part of the accessory can break, which in turn exposes metal components that could pose a hazard. Dell has already received 11 reports of this occurring.
https://www.notebookcheck.net/Electric-shock-risk-forces-Dell-to-recall-Hybrid-Adapter-Power-Bank-accessory-for-laptops.406026.0.html