Answer
4 batteries for $4.69 is the better buy.
Work Step by Step
4 batteries for $\$$4.69 --> $\frac{\$4.69}{4\text{ batteries}} = 1.1725 \frac{\text{ dollars}}{\text{ battery}}$
10 batteries for $\$$14.89 --> $\frac{\$14.89}{10\text{ batteries}} = 1.4890 \frac{\text{ dollars}}{\text{ battery}}$
1.1725 < 1.4890