iPod remained in the water for a few seconds.

Hi. I recently dropped my 6th gen nano IPOD in the water, but I was able to take it away very soon. After that I dried it with a towel, left in the rice for 5 days, and, after this, dried it under a lamp for one night. Then, when I tried to charge it, the IPOD turned on and worked properly. Although it was kind of slow and whith some bugs sometimes, I even could listen to the musics. The problem is that when I disconnect it from the charger, the IPOD turns off immediately. It is like if it hadn't charged.

Any ideas of what components are damaged? Can I fix it?