I just had my first 'service' done at 10,000 miles. They actually change some filters inside the battery pack, so I'm not sure you want to do it yourself. I'd look into it a bit more, it's possible they are on the edge of the pack or on the outside (I haven't opened up the bottom of the car...
Once you get your code all set up, I highly recommend using the EvAccess app if you are using an Android phone...so much better interface - designed by a B-Class owner...and free.
This may be a silly question, but where are you getting this ev-app from? Is it in the Android market or is this a webpage. The only app I can find is the MBrace app and my dealer is a bit clueless. Any links or help would be appreciated. Thanks everyone!
Did a search on Ebay using a 2014 Mercedes B250 and found quite a few available. Here's one from LA: http://www.ebay.com/itm/400522637383?_trksid=p2060778.m1438.l2648&ssPageName=STRK%3AMEBIDX%3AIT