A lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material, along with a non-aqueous electrolyte solution.

Lithium batteries are divided into two categories: non-rechargeable and rechargeable. Non-rechargeable batteries are called primary batteries, which can only convert chemical energy into electrical energy at one time, and cannot restore electrical energy back to chemical energy. Examples include lithium-manganese dioxide and lithium-thionyl chloride primary batteries.

On the other hand, rechargeable batteries, or secondary batteries (also called accumulators), can store electrical energy as chemical energy and convert it back to electrical energy when in use. This process is reversible. A common example is the lithium-ion battery found in mobile phones and many other consumer electronics.

The difference between lithium and lithium-ion batteries is that one is not rechargeable (primary cell) and the other can be recharged (secondary cell). In addition to this, Lithium batteries have a shelf life up to four times longer than lithium-ion batteries and are also much cheaper and easier to make.

primary lithium battery

1. Lithium Primary Battery

Also known as a primary lithium battery, this type of battery can be discharged either continuously or intermittently. Once the battery is depleted, it cannot be reused. Lithium primary batteries are commonly used in low-power electronic devices like cameras.

These batteries have an exceptionally low self-discharge rate, allowing them to be stored for up to 3 years. For optimal storage, keeping them in a cool environment, such as refrigeration, can further enhance their longevity. However, do not confuse lithium primary batteries with lithium-ion batteries. Lithium primary batteries cannot be recharged, and attempting to charge them is extremely dangerous!

2. Lithium-Ion Battery

Also known as a secondary lithium battery, this type of battery has a low self-discharge rate and can be stored for over six months at 20°C without significant capacity loss.

However, it’s important to manage the self-discharge phenomenon in lithium-ion batteries. If the battery voltage drops below 3.6V for an extended period, it can lead to over-discharge, damaging the internal structure and reducing the battery’s lifespan. To maintain optimal performance, lithium-ion batteries should be recharged every 3 to 6 months. The recommended storage voltage is between 3.8V and 3.9V (ideally around 3.85V), with the battery's charge depth maintained at 40% to 60%—never fully charged.

For long-term storage, keep the battery in a dry environment, ideally between 4°C and 35°C. It should be kept in moisture-proof packaging, away from heat sources, and not exposed to direct sunlight.

Comparison Dimension

Primary Lithium Battery

Lithium-Ion Battery

Rechargeability

Non-rechargeable (single-use)

Rechargeable (designed for hundreds to thousands of cycles)

Battery Type

Primary cell

Secondary cell

Anode Material

Metallic lithium

Graphite or other lithium-intercalated compounds

Cathode Material

Typically manganese dioxide, thionyl chloride, etc.

Lithium metal oxides (e.g., LiCoO₂, LiFePO₄, NMC, etc.)

Nominal Voltage

Varies (around 1.5 V up to 3.7 V per cell)

Typically ~3.6–3.7 V per cell (up to ≈4.2 V when fully charged)

Energy Density

Very high initial energy density by weight

Competitive energy density with the added benefit of rechargeability

Self-Discharge/Shelf Life

Extremely low self-discharge; capable of retaining charge for many years

Higher self-discharge and gradual capacity fade over time

Applications

Low-drain, long-life devices (e.g., cameras, watches, medical devices)

High-drain and frequently used devices (e.g., smartphones, laptops, EVs)

Safety & Management

Simple construction; not designed for charging; attempting to recharge may be dangerous

Requires integrated protection circuits and battery management systems to prevent overcharge, deep discharge, and thermal issues

Summary and Practical Implications

Primary lithium batteries are best when you need a battery that lasts for years without needing to be recharged (think of devices that are rarely accessed or need to work “out of the box” in critical scenarios). They are simpler, often offer excellent shelf life, and have high initial energy density but cannot be recharged.

Lithium-ion batteries are the workhorses of modern electronics. They support repeated recharging cycles, making them ideal for our daily-use devices such as phones, laptops, and electric vehicles. The trade-off comes in the form of a more complex design requiring sophisticated management circuitry and a generally higher self-discharge rate.