I didn't like so much that the AEMLIC V1 has a 2.2V/80mA output while many wireless development boards need 3.3V and a higher current. Therefor I have designed the new AEMLIC V2. It has an TPS63900 buck boost converter that delivers 3.3V/400mA. It is again based on the trusted AEM10941 (there was a problem with the newer AEM10300).

When AEM10941 storage voltage drops below 2.5V STATUS1 pin goes high and the host processor is immediately informed of an impending shutdown so it can gracefully end EEPROM FLASH/EEPROM write operations before it's power is shut off. The buck booster enable pin is controlled from the AEM10941 VHV output that goes low 600ms AFTER the host processor is warned. 

The bare PCB looks like this

The assembled PCB looks like this

And after soldering onto headers and adding a 250F Lithium Ion Capacitor and a solar panel it looks like this. 

I have performed full hardware design verification and found no problem. 

Then I felt confident enough to order the first batch of 50 from Elecrow. They are currently being produced and I expect that they are available for sale end of March 2022. Elecrow already share an image of the bare PCBs

Normally the TPS63900 buckboost converter is $0.80USD in qty1000 but the stocks were drying up at the normal distributors and so in January 2022 I have bought 220pcs from ICSOSO for $2.10 each. 1 Month later all stocks were completely dried up and Elecrow could source it for $39 each! So I was happy I bought some.

I am so excited about this new board because it uses an awesome solar energy harvesting chip, it stores the energy in a truly green storage device and it is can supply high enough current to power most IoT projects, not only BLE or LoRa but also NB-IoT, LTE-M, and wifi.  This week I expect shipping info, which means the board will arrive next week around wednesday. I am so excited!