HTC 626 | My battery went to 0% and it wont run after hours of charging

Hello, I had my battery go down to 0%. After that I put it for charge but after few hours now, it won't run. Holding power/power+volume buttons doesn't work. And red light is blinking which never happened before(usually when it's low on battery red light is just on, doesn't blink), what could be the issue?

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