Choosing the right battery pack is crucial for stable operation when using the L298N motor driver to power an Arduino. The L298N has a built-in 5V voltage regulator, which can be used to power the Arduino, but it requires a sufficient input voltage to function properly. A 4x AA battery holder provides 4.8V–6V(depending on the battery type), while a 6x AA battery holder provides 7.2V–9V. Since the Arduino requires a stable 5V supply, will the L298N’s regulator work effectively with a 4x AA battery pack, or is a 6x AA battery pack necessary? Additionally, will the choice of battery pack affect motor performance, and which option is more reliable for long-term use?
You will have to check which voltage regulator is on the board. For a LM7805, the minimum input voltage that will result in stable regulation is 7V so 4 AA batteries will not be sufficient.
The L298 itself will drop around 2V. So with 4 AA batteries, you you will only supply 4V to the motors; so it depends on the specifications of the motor if that is sufficient.
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I suggest you re-visit your design and get a better motor driver, one that uses MOSFETs. With your existing design you will burn over 30% of your battery energy as heat which does nothing for you,.
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