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Help Samsung galaxy s2 problem need help

Okay i have a problem my phone works really good but the battery. the battery is very weak. after max. 4 hours the battery is at 0%. i have no idea why but i found this problem since my phone fell into the water.
The phone also is really hot.
i tried to buy i new battery but it is still the same the battery is at 0% after 4 hours.
I also checked the battery usage its all looks normal.
can someone help me?
 

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