14500 vs 16340 Battery Size: What Is the Difference?

The numbers in these battery format names indicate approximate dimensions. A 14500 cell is nominally about 14 mm in diameter and 50 mm long. A 16340 cell is nominally about 16 mm in diameter and 34 mm long.

This means the 16340 is approximately 2 mm wider, but about 16 mm shorter. For product designers, the distinction matters when a battery sits inside a molded enclosure, a cylindrical holder, a compact lighting product or a custom battery compartment.

Actual finished dimensions can vary by manufacturer and construction. Button-top terminals, protection circuits, wrappers and welded tabs may increase the overall size. Always use the approved product drawing and maximum dimensional tolerances when designing a holder or enclosure.

14500 vs 16340 Battery Specifications

PKCELL lists representative 14500 and 16340 rechargeable lithium-ion cells with a nominal voltage of 3.7V. The following figures illustrate two specific product configurations rather than fixed specifications for every cell in either format.

Explore the 14500 lithium-ion battery specifications and the 16340 lithium-ion battery product page for model-specific information.

Do not assume that every 14500 cell has an 800mAh capacity or every 16340 cell has a 700mAh capacity. Available capacity depends on the particular model, electrode design, chemistry, discharge conditions and other manufacturer specifications.

14500 vs 16340 Capacity: Which Lasts Longer?

Capacity, expressed in milliamp-hours (mAh), indicates how much electric charge a battery can deliver under specified test conditions. For the representative products above, the 14500 cell has a higher rated capacity: 800mAh compared with 700mAh.

However, capacity alone does not establish which battery will deliver longer runtime in every application. Actual performance depends on the device’s current demand, cutoff voltage, temperature, conversion losses, battery age and discharge characteristics.

Compare Stored Energy as Well as Capacity

Watt-hours (Wh) combine nominal voltage and capacity to provide a useful estimate of stored energy.

Energy (Wh) = Nominal Voltage (V) × Capacity (Ah)

• 14500 example: 3.7V × 0.8Ah = 2.96Wh.
• 16340 example: 3.7V × 0.7Ah = 2.59Wh.

These calculations suggest that the listed 14500 example stores more nominal energy. They do not guarantee a particular operating time. For a device with variable loads, measure the average power demand and validate the result under realistic operating conditions.

14500 vs 16340 Voltage: Are They the Same?

Both 14500 and 16340 are available as 3.7V nominal lithium-ion cells. This shared nominal voltage can make them appear electrically similar, but it does not make them universal substitutes.

For a conventional single-cell 3.7V lithium-ion product, the fully charged voltage is commonly 4.2V. The exact permitted voltage range and charging conditions must be confirmed using the selected cell’s datasheet.

Three voltage checks are especially important:

1. Nominal voltage: the reference voltage used to describe the cell.
2. Maximum charging voltage: the upper charging limit specified for the particular chemistry and model.
3. Operating and cutoff voltage: the voltage range the device can accept under actual load conditions.

Do Not Confuse 16340 With CR123A

A rechargeable 16340 is also commonly called an RCR123A in the market. However, a rechargeable 16340 lithium-ion cell is not automatically interchangeable with a primary CR123A battery.

Standard primary CR123A cells typically have a nominal voltage of 3.0V, whereas rechargeable 16340 lithium-ion cells commonly have a nominal voltage of 3.6V or 3.7V, depending on the model. Their fully charged voltage and charging requirements also differ.

Before replacing a CR123A with a rechargeable cell, check the device manufacturer’s approved battery types, voltage limits and charging instructions. Similar dimensions do not establish electrical compatibility.

For a broader overview of cell chemistries and voltage ranges, see PKCELL’s 3.7V battery guide.

Can You Replace a 14500 Battery With a 16340?

In most devices, a 14500 and a 16340 should not be treated as direct replacements. The 16340 is wider and shorter, so it may not fit a holder designed for a narrower 14500. Even if the cell can be physically installed, electrical and terminal compatibility must still be verified.

Check These Six Compatibility Factors

1. Physical fit: confirm the maximum cell diameter and length, including terminals, wrapper and protection components.
2. Voltage range: confirm that the device accepts the cell’s nominal, fully charged and loaded voltages.
3. Capacity and runtime: verify that the selected cell meets the required operating time.
4. Discharge capability: check continuous current, peak current and allowable temperature rise.
5. Terminal and polarity: confirm flat-top or button-top construction, contact layout and electrical polarity.
6. Charging and protection: use a compatible charging system and verify the protection requirements of the device.

Never assume that a spacer or modified holder makes the two formats interchangeable. An improvised connection can introduce unstable contact, additional resistance or other electrical and mechanical risks.

14500 vs 16340: Which Battery Is Better for Your Application?

When a 14500 May Be the Better Choice

A 14500 is worth evaluating when the product requires a relatively narrow cylindrical cell and the enclosure has sufficient length. Potential application categories include:

• Compact electronic equipment designed for the 14500 format
• Portable instruments and handheld devices
• Selected lighting products with compatible voltage requirements
• Small electronic assemblies and custom battery packs

Its AA-like dimensions can simplify some mechanical layouts, but a rechargeable 14500 must not be assumed to replace a 1.5V AA alkaline battery. Their voltage characteristics are different.

When a 16340 May Be the Better Choice

A 16340 may be appropriate when the enclosure has limited length but can accommodate a wider cell. Possible application categories include:

• Compact lighting products designed for rechargeable 16340 cells
• Space-constrained handheld electronics
• Selected monitoring or control devices with compatible power systems
• Equipment originally engineered around the 16340 form factor

The correct choice depends on the approved electrical specification, available space, expected runtime, current profile and charging design. Application examples alone do not establish suitability for a specific device.

Choosing Cells for a Custom Battery Project

For OEM products, the battery decision should start with the device’s electrical and mechanical requirements rather than the cell model number. Document the available battery space, average and peak current, operating time, temperature range, terminal type and expected production quantity.

If your device requires a wired connection, protection circuit, temperature sensor or a non-standard arrangement, review PKCELL’s customized battery solutions. A custom design can be evaluated against the actual enclosure and power requirements instead of forcing a standard cell into an unsuitable space.

Frequently Asked Questions

Conclusion

The 14500 vs 16340 battery comparison comes down to more than physical dimensions. A 14500 offers a narrower, longer form factor, while a 16340 is wider and shorter. Both are available in rechargeable lithium-ion versions with a nominal voltage of 3.7V, but capacity, discharge performance and terminal construction vary by model.

Before selecting or replacing either cell, verify the datasheet, dimensional drawing, voltage range, charging method and current requirements. For an OEM project or bulk purchase, contact PKCELL to discuss your battery requirements and identify a suitable product for your application.