In the attachment, which comes from a text "Introduction to Electrodynamics" by Griffiths. There are two statements: "Within an ideal source of emf (resistenceless battery), the net force on the charges is zero, so $\vec{E} = -\vec{f}_s$" and further down at the bottom we have the statement "inside the battery $\vec{f}_s$ drives current in the direction opposite to $\vec{E}$". Would the correct interpretation of this be that the charge has no net force when it moves through the battery (since $\vec{E} = -\vec{f}_s$) and so essentially the charge is moving at a constant velocity within the battery, it entered the battery at an initial velocity from being driven by the electric field force from the electric field in the rest of the circuit (where in the circuit itself it has a net force $\vec{E}$ per unit charge)? Is this the correct interpretation? Or close?
Thanks.