Well first things first , you need to get it powered up. Your battery should charge as long as you have the proper charger. The connector from the battery to the computer is suspect if the battery is taking a charge. Test battery w a volt meter to know what you have. Trouble shooting is a method of canceling . For instance ,usually check the obvious . Things that get the most abuse , like the cord or the battery . How old is the battery , if it's over a year there isn't much left. Depends on use of course , then if you have voltage evrywhere but the computer then the obvious is the connector and if that is the case did you forget to plug in the jumper from that connector.
I would certainly retrace your install and double check everything, I can almost guarantee it's something easy and stupid.
Good luck !