Bought a used Yi Lite. Won't turn on. What can I do to trouble shoot?

Bought it from eBay. Battery and SD card are in there. When connected to power only the LED near the lens is showing red. My USB tester thingy shows it is using 1.3-0.5 A. When I press the power button I sometimes get one red blink from the LED in the button. The case gets hot when it is using 1A. But that is not all the time. Very strange.

A few questions: does the Yi Lite boot without a SD card? Does the Yi boot without a battery and only usb power? Does it boot at all connected to power?