The batteries are excellent, solid construction, fit perfectly into the camera, their connectors are plated in gold and all the batteries have the same weight, their display makes it much easier. I did the test comparing these batteries to the original ones from a BMCC 6KFF and the result was basically the same: Zitay NP-F550 7.2V 3500MAH achieved: 64:54 min and the Original NP-F570 7.27V 3350MAH: 67:26 min.
This test was done recording in 6k open gate 30p, BRAW 8:1, brightness at 50% and using an external SSD via USB-C.

Charging time with a 20w fast charger was 110 minutes for both.

Furthermore, the store's service is excellent, it answered many questions and always kept me informed about shipping, I will buy again.