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I recently built a DIY starting battery using used CALB 72ah cells and a Daly smart BMS.
This was an experiment because the cells are only rated at 72 amps, 144 amps peak... but I was able to get over 500A continuous for 30 ish seconds cranking a 7.3 PSD.
This video is a showcase of what happens when the battery gets full while driving. Will it overcharge your battery?
Spoiler alert: No, the BMS does it's job and disconnects the cells when the target voltage is reached, allowing power to be used(if needed), but the cells will not 'float'.
Edit: Just a note for anyone interested - it would be best to add a capacitor to add voltage stabilization to the system after the batteries are disconnected, to prevent high spikes(remember, it can't spike lower than the battery voltage of ~13V, because the battery will discharge, but not charge)