Could I use 6 NiMH 1.2V batteries and keep pressed the small black circle in the battery compartment in order to adjust the battery gauge and low battery alarm?



Yes, pressing the button will affect the indicator and low battery alarm/shutdown.

From the official LEGO firmware:

#define   BATT_INDICATOR_HIGH           7500          //!< Battery indicator high [mV]
#define   BATT_INDICATOR_LOW            6200          //!< Battery indicator low [mV]

#define   ACCU_INDICATOR_HIGH           7500          //!< Rechargeable battery indicator high [mV]
#define   ACCU_INDICATOR_LOW            7100          //!< Rechargeable battery indicator low [mV]


#define   LOW_VOLTAGE_SHUTDOWN_TIME     10000         //!< Time from shutdown lower limit to shutdown [mS]

#define   BATT_WARNING_HIGH             6.2           //!< Battery voltage warning upper limit [V]
#define   BATT_WARNING_LOW              5.5           //!< Battery voltage warning lower limit [V]
#define   BATT_SHUTDOWN_HIGH            5.5           //!< Battery voltage shutdown upper limit [V]
#define   BATT_SHUTDOWN_LOW             4.5           //!< Battery voltage shutdown lower limit [V]

#define   ACCU_WARNING_HIGH             7.1           //!< Rechargeable battery voltage warning upper limit [V]
#define   ACCU_WARNING_LOW              6.5           //!< Rechargeable battery voltage warning lower limit [V]
#define   ACCU_SHUTDOWN_HIGH            6.5           //!< Rechargeable battery voltage shutdown upper limit [V]
#define   ACCU_SHUTDOWN_LOW             6.0           //!< Rechargeable battery voltage shutdown lower limit [V]

The BATT_* are used when the button is not pressed and the the ACCU_* values are used when the button is pressed.


The small black circle is used by the Li-ion battery pack from LEGO. This battery pack actually operates at a higher voltage that Alkaline batteries. On the other hand, NiMH batteries operate at a lower voltage than Alkaline, so pressing the small black circle would have the opposite effect of what you are hoping that it will do.

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