A state-of-charge (SOC) circuit makes a continuous contact with terminals of a battery and monitors voltage of the battery to detect that the battery has an SOC greater than a threshold SOC. In response, the SOC circuit establishes a state of an SOC indicator to indicate that the battery has an SOC greater than the threshold SOC. The threshold SOC corresponds to an SOC of the battery for storing or transporting the battery, and can correspond to a governmental regulatory or commercial SOC. A container for storing and/or transporting a battery includes an SOC circuit and SOC indicator to detect and indicate that a battery, held in the container, has an SOC greater than the threshold SOC. A method uses an SOC circuit and SOC indicator to detect and indicate that a battery has an SOC greater than the threshold SOC.