Re: Linking a different account to Battlelog.

You can link all of your platforms under one Origin account.  I have 2 PS3 soldiers, 1 Xbox soldier, and 1 PC soldier all under the same Origin account.  What you need to do first is link your PSN ID to your Origin account like you did with your Xbox Gamer tag. 

To link your PSN ID and Origin account

Step 1 - Go to www.ea.com

Step 2 - Click on 'Login' in the upper right corner, if you are already logged in, log out.

Step 3 - Now the login form pops up, ignore the textfields and click the PSN\XBL button below

Step 4 - A new window pops up that allows you to login with your PSN\XBL account.

Step 5 - Now that the EA Server knows that you are the owner of this PSN\XBL account and if you already have an EA account you can now login to connect both accounts. In case you don't have an EA/Origin account yet, simply click the link on the right side to create one.

Next when you start BF3 for the first time it will ask you to log in with your Origin account or to create a new origin account.  Use the same origin account that you linked with your PSN ID and used for linking your Xbox Gamer tag.  Play a few rounds of Multiplayer after everything is set up and then log into battlelog.battlefield.com with the same Origin account that you logged in with on your PS3 version of BF3 and you'll see your soldiers.

If you receive an error that your PSN ID is already linked with another account you will need to speak with a Game Advisor.  You can speak with a GA here: EA Customer support:  https://help.ea.com/contact-us   I recommend to select the "call me" function so you don't have to wait on hold for a long time.