Chosen Solution

My Apple watch series 4 back glass broke near the heart sensor. It was on post that but had only 10% battery. It got switched off n post that it is not turning on. Even is showing the charging snake symbol and then the time. It is not turning on. The display was fine after the back glass broke. I’m unable to understand the problem

You’ll need to visit an Apple Store as the battery likely swelled pushing on the back damaging it. Hopefully they will cover it under warranty.