AND .. an update bit of little known (it seems) info about overheating 4K camcorders, dashcams etc. As a 'designer' and once upon a time owner of a Sony A7RII which ran 4K 30p video for 18 minutes before 'overheat shutdown' ... (luckily my daughter's wedding was open air 32 degrees C in Cyprus and only lasted 12 minutes! ), I determined to find a solution. The 'designer' logic in my head, told me that two things in that camera generate heat. Number 1 is the massive processing functionality of the own onboard encoding chip. Number 2 is the Li Ion tiny battery from which the processor is getting the power in order to do all that heat generating work.
The fix - so simple you wouldn't believe it .... attach an external high current delivery USB backup battery via the USB input to the camera - with a fully charged internal Li Ion in place in the camera. The extra current delivery capability of the outside battery supplies the internal chip and gets the thing going with heat et al .. BUT .. the INTERNAL battery has what they call a higher source impedance than the external battery, so whilst the power hungry internal chip works away, the majority of current is taken from the big daddy outside the camera and the inside one just cruises along and stays lukewarm, or even cool. Thus you have halved the heat delivery inside the camera .. and it runs for two hours no problem ... provided that you have something nice like an Anvika sat on the outside. The same applies with my Yi4K+ ... albeit this has run in my dashcam mode without an external battery, just an adaptor into my cigarette lighter socket, and not overheated at 4K 60p in two hours either. So please think about this when intending to use 4K camcorders in hot or long term videoing applications. It's the simplest and cheapest fix.
The fix - so simple you wouldn't believe it .... attach an external high current delivery USB backup battery via the USB input to the camera - with a fully charged internal Li Ion in place in the camera. The extra current delivery capability of the outside battery supplies the internal chip and gets the thing going with heat et al .. BUT .. the INTERNAL battery has what they call a higher source impedance than the external battery, so whilst the power hungry internal chip works away, the majority of current is taken from the big daddy outside the camera and the inside one just cruises along and stays lukewarm, or even cool. Thus you have halved the heat delivery inside the camera .. and it runs for two hours no problem ... provided that you have something nice like an Anvika sat on the outside. The same applies with my Yi4K+ ... albeit this has run in my dashcam mode without an external battery, just an adaptor into my cigarette lighter socket, and not overheated at 4K 60p in two hours either. So please think about this when intending to use 4K camcorders in hot or long term videoing applications. It's the simplest and cheapest fix.