Don't overlook the real strengths of the Audirect Beam4 by dismissing it as just another battery-powered DAC/Amp. The Beam4, with its internal battery operational between 3.85V-4.2V, features a built-in MCU system for intelligent power allocation. It can assess its own battery level and the connected device's power to determine when to draw power. So, how long does the battery last? Official tests reveal that when connected to a computer, it can run for over 48 hours continuously (theoretically, it can run indefinitely but it's recommended to charge for battery health). When connected to devices like smartphones with limited battery capacity, it activates charging from the device when the voltage drops below 3.7V, ensuring prolonged usage until the smartphone's battery depletes. Without relying on OTG power supply, it can last for over 7.5 hours. In summary, the Beam4 is a battery-powered DAC/Amp with a substantial power output, extended battery life, and the ability to conserve the phone's battery power, addressing concerns around battery life for portable DAC/Amps. It's a versatile option for those concerned about audio quality degradation due to low battery or short battery life, making it a practical choice for various user preferences.

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