mobile

One month ago,i dropped my Htc one mini 2 in a pot of water. I should say that i rapidly took it out (3-4 sec.)
The screen remained on for just 10 seconds, then the phone became completely dead. I have used rice, silica gel and i managed to turn it on,but the phone was rebooting every 5 minutes. At least no other part was damaged, while it was on i could connect it to WiFi, listen to music to speakers,play games... I`ve sent it warranty, they told me that they can repair it after i pay ~150 euros.

After i received it, i wasn`t able to turn it on at all. The led was blinking and all i could get was the logo with the red battery. (photo in thread). I succeeded to turn it on by pressing the power button+volume up 2 minutes.
Battery shows 0%, 0 mAh, 3,37V.
Is it a dead battery?What should i do? Before warranty the battery was completely fine.
I live in Romania, and here there are only 2 authorized services. Except that, i trust no one.
Please, if u know some solutions that may help, answer this post.
Thank you for patience and help.

PS: I want to highlight the lack of water resistance of this phone...

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