Which battery do I have in my razr hd maxx?

My battery for the past couple months has diminished. When I first bought this phone, about 15 months ago, it held a charge for over 24 hours. Now, it is lasting only about 6-8 hours.
I would like to replace the battery in the phone. But, short of taking the phone apart and looking myself, then putting it back together until I receive a proper replacement battery, I would like to know which battery I have in my phone, whether it is the EV40, or the EB40?

It's best to just send it in if you can.. and have the Battery replaced..  Here some sites that can help assist in doing this
Are there any suggestions on how to extend the battery life? (DROID RAZR HD/MAXX HD)
DROID RAZR MAXX HD Service & Repair

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