The poor regulation around this is pretty bad for startups. Personally I've taken to only buying rechargeable battery powered devices from big brands. Anything else and I look for a power cord, single-use batteries, or mechanical operation.
It's not an ideal solution and not just because of examples like the Samsung Galaxy Note7. It's because I love rooting for the startups, the disruptors, the innovators. But in the world of battery powered products I'm inclined to think (or hope!) that the bigger players have more to lose by cheaping out on cheap batteries.
I have the same policy. It's not worth risking your life just to save a bit of money or try some gadget that is only made by a no-name brand. Often you keep these devices very close to your body or head (e.g. earphones) where they can do a lot of damage if they suddenly explode.
I learned this lesson over 10 years ago when I was visiting a night market in China with someone. He was so delighted with how cheap the portable chargers were that he bought a bunch to give to his friends/family back home. When we returned to the hotel one of them started emitting smoke. From that day I've only ever bought reputable brands, and even then I worry about it.
It's not an ideal solution and not just because of examples like the Samsung Galaxy Note7. It's because I love rooting for the startups, the disruptors, the innovators. But in the world of battery powered products I'm inclined to think (or hope!) that the bigger players have more to lose by cheaping out on cheap batteries.