Inductive phone charger mod - doesn't work with battery too close?
Passerby and Russel; thanks for the feedback. It turns out what I thought was a thin piece of foam spacing with adhesive on it was actually a thin sheet of metal; I would assume lead. This explains the interference and why it wouldn't give me the problem if I introduced enough space between the coil and battery. After installing this lead disc between the coil and battery, the issue is resolved. Thank you again for the help!