The overheating is not rumour but a fact documented and reported in forums and news papers. Most of the batteries are fine, it is just when a "no name" assembler skimps a few steps and sells dirt cheap, that there can be problems. A lot of cases of cell phone batteries catching fire and/or exploding are reported here in India. A few cheaper camera batteries also have over heated. So as long as you know that the battery is good, it is fine. With a new manufacturer, I would buy and test the battery for - overheating and charge capacity before endorsing it.
