I see the ESP32 boards are back up. Bummed, when I decided to purchase one, they were out. I wound up getting a "DOIT" brand ESP32. Which does not have the battery connector. Why is the ESP32 lite version cheaper than the Wemos Mini Pro? Does the tin can on the top of the pro version help with radio interference? Are they both fcc certified or just the Pro? What would be the benefits of an onboard sd slot? Data logging? Curious... Why is there not an mpx antenna like the Mini Pro?