For anyone wondering how come chinese product with Li-ion battery explodes here is a good entry level walkthrough&#x2F;explanation based on ~$20 LED &quot;20W&quot; floodlight example.<p><a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Ag5XknXGkZ8" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=Ag5XknXGkZ8</a><p>Sins:<p>- absolutely atrocious manual build quality.<p>- no real load current control, replaced with wishful thinking and best case scenario back of a napkin calculated circuit.<p>- nasty power supply pretending to be a charger with ZERO protection and NO CUT-OFF. It will charge until something melts or blows.<p>- all electronic components underrated.<p>- 100% fake parameters.<p>Now you might say not everything from china is like that, there are good and bad engineers everywhere. That is true, except better engineers work at Xiaomi, Rigol, Lenovo‎, etc. You simply cant expect any quality from no name fly by night Shenzhen outfits. Just read Chinese reactions to excellent Amazon move from the link Animats gave earlier:<p><a href="http:&#x2F;&#x2F;qz.com&#x2F;582542&#x2F;chinas-makeshift-hoverboard-industry-is-imploding-after-amazons-safety-crackdown&#x2F;" rel="nofollow">http:&#x2F;&#x2F;qz.com&#x2F;582542&#x2F;chinas-makeshift-hoverboard-industry-is...</a><p>They are shutting down and moving on to counterfeiting something else instead of working on security of this product!?!?!! Actually hiring an engineer is too much hassle. :&#x2F;