Methods and systems are provided for an adaptive state-of-charge for a portable imaging system. In one embodiment, a method comprises controlling an x-ray source to generate an x-ray exposure, measuring a voltage of a power supply coupled to the x-ray source during the x-ray exposure, and adjusting an available capacity of the power supply based on the voltage. In this way, the full capacity of a power supply may be utilized while compensating for aging of the power supply.
