The instructions that come with the BRTONG replacement battery state the following:

1) Discharge it to 2% (quite specific) and then charge to 100% at the first cycle after purchasing

2) Do not discharge the battery pack to 0% as that will damage the battery pack and shorten its life (this does not specify WHEN not to do it. Only during the first cycle?)

This is very different from the ifixit instructions above , but ifixit could be referring just to the calibration, which could be done AFTER the first cycle, and the manufacturer could be referring just to the first cycle, and not to the calibration. I am not sure what to do. But I guess I will follow the manufacturer instructions during the first (and second, to be safe) cycles, and THEN follow the ifixit instructions for calibration.