[A device] running [how long]
doing [what]. Size the battery:
chemistry, capacity, charge and
discharge rates, protection —
and what the pack looks like
after two years.

Design a Battery System

Sized for year two, not for the first charge.

Prompt

For [a device] that must run [how long] doing [what], size the battery system: chemistry, capacity, charge and discharge rates, protection, and what the pack looks like after two years of realistic use.