Primary vs. secondary batteries In contrast to rechargeable secondary batteries, primary batteries are typically intended to be:

Introduction / Context:
Battery technologies fall broadly into primary (non-rechargeable) and secondary (rechargeable) chemistries. Selecting the correct type affects device design, cost, safety, and environmental impact.

Given Data / Assumptions:

• Primary cells: alkaline, zinc–carbon, lithium primary, etc.
• Secondary cells: Li-ion, NiMH, lead–acid, etc.
• Focus is on reusability versus single-use.

Concept / Approach:
Primary batteries are designed for single discharge. Their chemistry is not intended for reversal by charging, and attempting to recharge can be dangerous. Secondary batteries are engineered for repeated charge–discharge cycles with appropriate chargers and protections.

Step-by-Step Solution:

Verification / Alternative check:
Manufacturer labeling and standards explicitly mark “primary” cells as non-rechargeable; chargers warn against use with primary batteries.

Why Other Options Are Wrong:

• Charged once: recharging primaries is not standard and unsafe.
• Recharged over and over: defines secondary batteries.
• Stored indefinitely: all batteries have shelf-life limits due to self-discharge and electrolyte/pack aging.

Common Pitfalls:
Assuming lithium batteries are always rechargeable—lithium primary (e.g., CR cells) are not.

Final Answer:
Used once (single-discharge) and then discarded.