AgentMikey,
I have a class 10 Scandisk 128gig card. On it I store all my apps along with video and games.
Earlier on this thread, it was posted that having apps on the internal memory will help with battery performance. I will have to try that and see how that goes . Makes sense of having to access the SD card all the time can cause a drain on power.
Then again...I do not use my phone to play games all day long-99% is emailing, surfing, calls, and windowsphonecentral app ....
Please update when you determine if having apps on the SD card causes batt drain. I just got my card and only put photos and videos there...and I placed Fav photos on the phone (not SD) so the live tile won't draw from the SD...hopefully my 1520s amazing batt life will stay amazing!