if your battery was working fine before your repair it is likely not the problem. It sounds more like you have a problem with your battery connection. Recheck that it is seated properly and is not damaged..there are plenty of people who have pulled the connection from the board.It may not be obvious so use a magnifying lens to look at the 4 prongs that attach to the board are all making contact, nothing bent, no dirt etc. Also check the battery itself isn't damaged/connector ok. Second idea would be to check connections from your dock connector to board are on properly. Sometimes you have to take it apart and put it back together to be sure the connections are good.