I also use 3rd party batteries, I make sure they do have the chip in them to control charging and prevent overheating,
I do care about my equipment that's why I have a 5 year macke warranty and also carry insurance coverage on it, so if it goes up in flames I'm covered..
having worked in the manufacturing industry for years, I'm quite sure than none of the leading camera companies have their own battery factory, they pay a company to put their name on the same batteries that are sold cheaper under a generic name..
also having worked in the camera industry for a few years, I wouldn't count on any camera manufacturer to replace a camera due to a defective battery, have fun proving that the problem was a defective battery, rather than improper charging, AKA operator caused problem...