The 61Wh battery is inventory, and you can order it manually by reaching out to the Support team. Support will make sure that you update to the latest BIOS, which has necessary updates to handle the 61Wh. Once we have updated BIOS available for each generation, we’ll be relisting 61Wh for general sale.
There is no bug in the battery. The firmware change is on the Mainboard end to avoid leaving the battery at full voltage for an extended period of time, which this battery chemistry isn’t optimized for.