When testing battery-powered portable devices under actual conditions, a DC power supply that can simulate battery performance under various conditions is required. The 2300 Series battery simulation power supplies are capable of simulating the output resistance and output voltage response of a battery. The dual-channel variant of these power supplies allocates one channel to act as a battery and sink current, which is used to simulate a discharging rechargeable battery; the other channel supplies voltage to test the charging control circuit of the device under test.