What is the flight time that you get with the 3500MaH Li packs.I wasn't suggesting just plain battery packs, there are plenty of devices that have proprietary battery packs, with management ICs for charging, but not the extensive PCB that is found in the anafi batteries.
But as explained above, the PCB on the anafi only adds a few dollars to the BOM, but it allows them to justify the exorbitant margins they get on battery packs.