I have a Nexus 5 running Android running 5.1.1. On the charger I normally carry with me, your android application doesn't seem to recognize that my phone is charging. I see the lightning bolt in the battery one my phone's status bar, and Folding@Home eventually recognizes that my phone is charged, but it never shows the charging icon as green. I have found that Folding@Home does recognize that I'm charging when I use a specific alternate charger, but there are other reasons why I chose the charger I normally carry with me.
This means you folks aren't getting as much CPU time from me as you could.
Thanks.
Adrian