Sounds like it might be worth attempting. My only additional suggestion would be to purchase/replace a single part at once, in case you find out that the problem with any of them isn't in fact the part, but the board. That way you won't make a large investment only to find out that the project is not going to work out. I'd start with the battery, because whether or not a good battery charges will help you determine if the DC-in board and battery connector are good.