Using a low-dropout regulator (LDO) to convert this higher battery voltage to a lower voltage would increase power dissipation in the pass device transistor and drain the battery faster when the standby load current is large. For example, if you have a 48V battery pack and try to convert it down to a 5V or 3.3V rail, then the conversion efficiency is roughly VOUT/VIN, which in a 5V output case will be 10.4%. The input current drained from the battery will be the same as the output current.
If your standby current for all monitoring peripherals is 5-10mA; this current would drain out of the battery directly if you just used an LDO. A DC/DC converter reduces the input current consumption because of the switching action of the internal field-effect transistors (FETs).
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