A battery, as in a stored source of energy, can represent:
- A source of energy, fuel, motivation, or inspiration
- Perseverance, or the ability to keep going
A low or dead battery can represent:
- Low energy, fuel, motivation, or inspiration
- Exhaustion or overwhelm, or trying to do too much
- The need to recharge, refresh, or start anew
- The end of a phase, cycle, event, project, etc.