Water damaged iPhone won't charge?

I dropped my iphone 4s down the toilet (stupid, I know) and it had water damage and wouldnt turn on.
it's been in an airtight container filled with silica bags for well over a week now, and i've turned it on.
Every function on the phone is working perfectly (camera, speakers, headphones, all apps etc)
the only problem is that my charge is 'stuck' on 31%,
I plug the phone into the charger, and it comes up with the 'connected' logo instead of the charging logo on the battery.

Is the phone actually charging or not? What should I do about this?

Sell it for parts as soon as possible. It will die completely in a few weeks.

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