1)Is there a way to reboot that I missed in my OP?
The hard reboot for the IQ Panel is to hold the Home button for 30 seconds. Rebooting can also be performed through the menu, but that obviously was not an option here.
2)Any suggestions on replacing the battery?
A heavily swollen battery can cause damage and possibly rupture, make sure to not reinsert if it is heavily swollen. It may have been causing pressure on the display/cabling.
We do not sell them in the store as the panel is discontinued, but the batteries are available as of this post. Should you need a replacement battery for your IQ Panel, please email customerservice@suretyDIY.com and they will be happy to get you what you need!