I would hope it is just the dock connector, it would be a bit odd as it is dead centre inside the ipad but it is solely responsible for bringing the power in.

it could be the dock connector or another guess would be that maybe the battery shifted slightly and the contact points arent making contact anymore? or maybe the dock connector cake loose off the logic board?

I dropped mine too. Now I have to plug and replug the power cord just right to get it to connect and charge. I do get it after multiple tries but its annoying. I think I'll change out the doc connector to see if it fixes.

My battries some times shows getting charge however after 8 or 10% , it get totally discharged and then does not get charge, nor it shows any sign of charging. Any solutions.