Growatt hybrid inverters: connecting DIY batteries

Very big newbie question here. Growatt offers two 10kW hybrid inverters for the European market. The SPH10KTL3-BH UP and the MOD 10KTL3-X. The first device has an emergency power supply port, the second can theoretically run in “backup mode” over the regular AC-output. But interestingly or not: the three-phase backup box facilitating this for the latter is not yet available from Growatt. In order to use the backup/EPS mode it seems that any battery connection is required. Growatt offers HV batteries in their ARK series, but they come at a price point that in the Dutch energy market is not really a sound investment (yet).

I have a question concerning the battery connection for a more DIY approach. Both devices also seem to support a more regular lead-acid battery system, for this even a temperature probe has been provided. How does that practically work with respect to charging and discharging? Is it a plain connection that would create a minimum of 100V and not exceed 550V, and the device has some sort of upper and lower voltage in which it tracks the maximum capacity? Or is battery management system still required on top of the actual batteries?

The manual states:

“Lead-acid LV(minimum voltage of single battery, default is 11.5V), Lead-acid CC(maximum battery charge&discharge current , default is 25A), Lead-acid CV(maximum voltage of single battery, default is 14.5V), Lead-acid Number(number of connected batteries, default is 12)”