Ok people, here an update. Some bad and good news.
BAD NEWS
1) The shortfalls in capacity where related to the actual capacity of the battery I got. I opened the case an checked the cells. They are CATL FFH3D3 cells with readings of 3.2v 275Wh on the QR code sticker. The whole banks is 48v 16S, but made of 16 pairs of these cells for a total of 32 cells. So... if my math is correct, this would give me 86Ah cells, so 172ah pairs, 16 of those pairs in series for a total capacity of 51.2V nomial at 172Ah = 8.8Kwh. They sold the battery as 10kwh. Cecilia explained to me that this is because when fully charged, supposely at 59V, you reach the 10kwh advertised. I dont think that is fair and have not been able to charge for more than 56V without the BMS shutting off the battery. Even the user guide that came with the battery states a max. charge voltage of 57.6V. So I settled with a bulk charge and float voltage of 54V to chill out and hopefully avoid cell bloating and long term issues.
2) The second battery I ordered did exactly the same. I was not able to charge beyond 56V without the bms shutting off. Ok. However, after I discharged the first 1.5kwh the battery shut off with a high temperature fault. After dozens of troubleshooting messages with Leo, an engineer from Felicity, and several hours of texting resistances, voltages, etc. Etc... the issue was the termistors in the temp. line were bad. Then all of the sudden the bms got stuck in "power on status" and the battery wont event turn on.
GOOD NEWS
1) They are sending me a replacement bms and temperature lines to fix the bad battery.
2) They communicate on time and are very willing to help me out.
3) Got a Victron Smart Shunt and are doing another battery capacity test to have a more accurate estimate, using the 56V as 100% SOC.
Will keep the forum updated on the replacement parts and the smartshunt results as I think these batteries (LPBF48200-S model) deserve some review.