help! htc one wont turn on

Hello, i got a big problem with my phone, 3 days ago i was outside and it started to rain so heavy and the phone got wet, by that time it was like in 3% charge, so i was expecting to die on me, it did, but since it got wet, i did not know if the phone was off because of the water, water damage and stuff, so i left it in rice for it to dry over the night and some days. Now some days had pass, i connect the phone to the wall charger and only the red led blinks, like each second, sometimes the screen shows the batery icon like when the phone goes out of charge, not showing increasing charge, just the battery icon. i dont know what to do, many told me the battery is unusable, other the usb conector needs to be replaced, at this i think might be true, since any usb charger will fit loose and disconnect easly. What do you think?

Found a video with my problem showing up

https://www.youtube.com/watch?v=MQwTSa2sYAs

My phone dont always show the battery logo