Hi, thank you for contacting JustAnswer.com. My name is***** will do my best to provide the right answer to your question.
Remove the battery again. Leave it out for overnight... I suspect that, unfortunately, your LG device is in a severe state of shock, at very least. Perhaps it may recover, but I suspect it won't. Still, this rest and reset must be tried.
The 'blinking LG screen' may have been, simply, the device going into a reboot loop.
Let me know next morning, how the LG device is now acting, please. Thanks.