They had a big issue with chip shortages and are currently testing a new chip-set that seems to be working, hopefully it will allow for a faster shipment.
FYI - there should be no battery issues caused by the AA unit, there is very, very limited drain from it. I have not had an issue with that and I have been beta testing since last summer. The biggest issue we dealt with was the constant on nature of the USB ports utilized for AA on the pickup. That has been resolved with the start/stop feature.
Unfortunately being at the mercy of the Chinese manufacturing industry to produce these units, it's going to be quite a while before they are going to be sold "commercially" however I have seen them available on Ebay from time to time.
You will get your units, just taking longer than anyone expected...including me!