def METHOD_NAME(t, x=None):
    # Variable (piece-wise) future loading scheme 
    if (t < 300):
        i = 2
    elif (t < 800):
        i = 3.5
    elif (t < 1300):
        i = 4
    elif (t < 1600):
        i = 1.5
    else:
        i = 5
    return batt.InputContainer({'i': i})