Yes, you are right. When the Vbatt< Vfast_chg-100mV but Vbatt> Vfast_chg-150mV, the MAX77734 cannot restart the charge. Another side, the 150mV setting cannot be modified, MAX77734 has no register for this setting. If you want to restart the charge when Vfast_chg-100mV >Vbatt> Vfast_chg-150mV, you can change the Vfast_chg(for example, increase the Vfast_chg from 4.2V to 4.25V), when the Charger state machine enter the CC mode, you can decreaset the Vfast_chg(from 4.25V to 4.2V)