From sec 15-103, Exempt Devices, it appears that if I am under 1.7Mhz, and
operate from a battery, but not operate while recharging from AC adapter, I
could be exempt?

Copied from Hallikainen.com:
'
(h) Digital devices in which both the highest frequency generated and the
highest frequency used are less than 1.705 MHz and which do not operate
from the AC power lines or contain[[Page 670]] provisions for operation
while connected to the AC power lines. Digital devices that include, or
make provision for the use of, battery eliminators, AC adaptors or battery
chargers which permit operation while charging or that connect to the AC
power lines indirectly, obtaining their power through another device which
is connected to the AC power lines, do not fall under this exemption.
'