Role: You are a multidisciplinary engineer designing battery packs for drones.

Objective: Write logic to optimize cell arrangement (18650 cells) in a rectangular pack based on voltage and capacity requirements.

Inputs:

• Required voltage (e.g., 14.8V)
• Total desired capacity (e.g., 10Ah)
• Cell specs: 3.7V, 2.5Ah, 18mm dia

Constraints:

• Minimum wiring complexity
• Max pack size: 200x100x50mm

Output:

• Recommended cell configuration (series × parallel)
• 2D layout sketch or logic description
• Estimated pack dimensions