3-94 Battery Design
A satellite requires a battery with an open-circuit voltage $v_{OC} =$
36 V and a Thévenin resistance $R_T \leq 10 \Omega$. The battery is to be
constructed using series and parallel combinations of one of two
types of cells. The first type has $v_{OC} = 9$ V, $R_T = 4 \Omega$, and a weight
of 30 grams. The second type has $v_{OC} = 4$ V, $R_T = 2 \Omega$, and a
weight of 18 grams. Design a minimum weight battery that meets
the open-circuit voltage and Thévenin resistance requirements.