Primary vs Rechargeable Lithium Batteries: Differences & Selection Guide

Primary vs Rechargeable Lithium-ion Batteries: Which One to Choose?

Lithium-ion batteries can be classified into two main types based on their charging method: primary (non-rechargeable) lithium-ion batteries and secondary (rechargeable) lithium-ion batteries. Understanding their differences is critical for choosing the right battery for your application.

### 1. Primary (Non-Rechargeable) Lithium-ion Batteries

Primary lithium-ion batteries are disposable batteries that can only convert chemical energy into electrical energy once. They cannot recharge (or have extremely poor recharge performance) and are designed for single use.

Common types of primary lithium-ion batteries include:

- **Lithium-Manganese Dioxide Batteries (Li-MnO₂)**: Also called lithium-manganese batteries, the most common primary lithium battery, used in cameras, watches, and small electronics.

- **Lithium-Thionyl Chloride Batteries (Li-SOCl₂)**: Also called lithium-thionyl batteries, with high energy density and long shelf life, used in IoT sensors, smart meters, and industrial equipment.

- **Lithium Other Compound Batteries**: Custom primary batteries for specific industrial applications.

### 2. Secondary (Rechargeable) Lithium-ion Batteries

Secondary lithium-ion batteries are also called storage batteries. They can reversibly convert electrical energy into chemical energy for storage, and then convert chemical energy back into electrical energy for use. They can be charged and discharged hundreds to thousands of times.

All the liquid lithium-ion and Li-polymer batteries we discussed in previous articles belong to this category, and they are the most widely used rechargeable batteries in the world.

### Key Differences Between Primary and Rechargeable Lithium Batteries