Which are the most common lithium-ion battery sizes for electronics?

The most common lithium battery sizes for electronics are 18650, 21700, and lithium polymer pouch cells.

Are lithium-ion battery sizes smaller than other types of batteries?

Yes, lithium battery sizes are generally smaller and lighter than those of traditional battery chemistries like lead-acid or nickel-metal hydride.

Can lithium battery sizes affect device performance? How?

Yes. So, choosing the right Lithium Battery Size is important because it can affect the device's runtime, power output, and overall performance.

What are the standard dimensions for lithium battery cells used in electric vehicles?

Several standard sizes, such as 18650 and 21700, are commonly used in electric vehicle battery packs.

How do I choose the right lithium battery size for my application?

Go through the factors such as required capacity, physical space available, voltage requirements, and weight restrictions. Then, select a suitable lithium battery size for your application.

Exploring Lithium Battery Dimensions: Different Battery Sizes

By Ufine, Updated on July 24, 2025

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1. Classification of lithium battery types by form factor

Lithium batteries come in several form factors, each suited to specific applications. Here’s a breakdown:

Form Factor	Shape	Common Uses	Size Flexibility
Cylindrical	Round tubes	Flashlights, power tools, EVs	Moderate
Prismatic	Rectangular	Power banks, energy storage systems	Moderate
Pouch (Polymer)	Flexible pouch	Smartphones, drones, wearables	High (customizable)
Button/Coin	Disc-shaped	Watches, calculators, medical devices	Limited

Each form factor offers unique advantages in terms of space efficiency, heat dissipation, and scalability.

2. Battery size codes explained

Understanding battery size codes can help you quickly identify the cell’s physical characteristics:

18650 → 18mm diameter × 65.0mm length
104050 → 10mm thick × 40mm wide × 50mm high
CR2032 (coin) → 20mm diameter × 3.2mm thickness

These naming conventions are often standardized under IEC (International Electrotechnical Commission) and ANSI (American National Standards Institute) regulations.

Part 3. Common cylindrical lithium battery sizes

The lithium-ion battery is a game changer in the electronic world. So, they come in various standard dimensions. Typically, they are denoted by a combination of their numbers, which show their height, width, and thickness (all in millimeters).

This variety of lithium-ion battery sizes is widely used in different industries for a range of applications, such as electronics and electric vehicles.

The most commonly used lithium-ion cell sizes are 18650 (18mm diameter, 65mm length), 21700 (21mm diameter, 70mm length), and 26650 (26mm diameter, 65mm length).

Battery Size	Similar Size	Capacity (mAh)	Diameter (mm)	Length (mm)	Uses
10180	N/A	70 – 100	10.1	18	Small devices like Bluetooth earphones, keychain flashlights
10440	AAA	250 – 350	10	44	Mini flashlights, mini stereos, speakers
14500	AA	700 – 1000	14	50	LED flashlights, toys, digital cameras
16340	CR123A	400 – 900	16	34	LED flashlights, laser lights
18350	N/A	700 – 1200	18	35	Vapes, flashlights, laser pointers
18490	N/A	1200 – 1500	18	49	LED flashlights, power banks
18650	/	1500 – 3500	18	65	Laptops, tools, e-bikes, flashlights
21700	/	3000 – 5000	21	70	E-bikes, solar lights, power tools
26650	/	2400 – 5750	26	65	RC toys, high-power flashlights
32700	N/A	6000 – 9000	32	70	EVs, solar storage, backup systems
32650	/	5000 – 6500	32	67.7	UPS, wind-solar systems, toys
38120	N/A	8000 – 12000	38	120	EVs, renewable storage, UPS
40152	N/A	10000 – 15000	40	152	EVs, solar storage, backup systems

Part 4. Pouch (polymer) lithium battery sizes

Typical Dimensions and Naming

Pouch batteries are usually labeled by their thickness × width × height in millimeters. For example, a “103450” cell is 10 mm thick, 34 mm wide, and 50 mm high.

They are widely used in:

Tablets and smartphones
Power banks

Although not as robust as cylindrical cells, prismatic batteries offer better energy density and packaging efficiency.

Advantages:

Custom dimensions allow perfect integration into thin devices.
High energy density with reduced packaging weight.
Ideal for complex-shaped battery compartments.

Applications:

Smartphones and tablets
Drones and UAVs
Wearables like fitness trackers
Portable medical devices

However, pouch cells are more susceptible to swelling and mechanical stress and require protective casing.

Part 5. Standard prismatic lithium battery sizes

Prismatic lithium batteries are known for their rectangular, hard-case design, offering higher space efficiency and structural integrity compared to cylindrical cells. These batteries are commonly used in applications that require modular battery systems, such as electric vehicles (EVs), solar energy storage, power banks, and Uninterruptible Power Supplies (UPS).

Unlike cylindrical batteries that follow standardized diameter and length codes (e.g., 18650), prismatic batteries vary widely in size depending on the manufacturer and the application. However, some typical configurations and size ranges are widely used across industries.

Common Prismatic Battery Characteristics:

Voltage Range: 3.2V (LiFePO₄) to 3.7V (NMC, LCO)
Capacity Range: 2000 mAh to 30,000+ mAh
Dimensions: Vary by design, commonly from 50 × 70 × 90 mm up to 100 × 200 × 300 mm
Shell Material: Aluminum or steel casing for safety and durability
Energy Density: Moderate to high (depending on chemistry)
Thermal Management: Better than pouch but slightly less efficient than cylindrical cells

Use Case Examples:

Electric vehicles (EV battery modules)
Solar and wind energy storage systems
Home and industrial backup batteries
Portable power banks and inverter-based systems

Prismatic cells are often selected for systems where modular design and structured packing are more important than absolute energy density. Their rigid rectangular shape makes them ideal for stacked battery modules.

Part 5. Button/coin cell sizes

Button or coin cell lithium batteries are compact and often non-rechargeable. They are named using a four-digit or five-digit code, such as CR2032, where:

The first two digits indicate the diameter (in mm).
The last two (or three) digits indicate the height (in tenths of a mm).

Examples:

Name	Capacity (mAh)	Discharge Current (mA)	Dimensions (mm)	Comments
CR927	30	–	9.5 × 2.7	Used in LED art and some Lego toys
CR1025	30	0.1	10 × 2.5	–
CR1130	70	0.1	11.5 × 3.0	Rare; used in car security, organizers, pedometers
CR1216	25	0.1	12.5 × 1.6	Used in lighted watches and LED decorator lights
CR1220	35–40	0.1 (CR), 0.03 (BR)	12.5 × 2.0	Keychain LED flashlights, some digital cameras
CR1225	50	0.2	12.5 × 2.5	Automobile remotes, digital watches
CR1616	50–55	0.1	16 × 1.6	Automobile key remotes, Game Boy cartridges
CR1620	75–78	0.1	16 × 2.0	Automobile key remotes, early digital watches
CR1632	140 (CR), 120 (BR)	0.1 (CR), 0.03 (BR)	16 × 3.2	Used in key remotes (e.g. Toyota Prius 2012)
CR2016	90	0.1 (CR), 0.03 (BR)	20 × 1.6	Digital watches, LED flashlights
CR2025	160–165	0.2	20 × 2.5	Watches, automobile remotes
CR2032	225 (CR), 190 (BR)	0.2 (CR), 0.03 (BR)	20 × 3.2	Most common coin cell; motherboards, remotes
CR2450	610–620	–	24.5 × 5.0	High current devices, long shelf life
CR2477	1,000	0.2	24.5 × 7.7	Highest capacity coin cell, versatile use
CR3032	500–560 (CR), 500 (BR)	0.1–0.2 (CR), 0.03 (BR)	30.0 × 3.2	Panasonic: used in motherboards, devices

Part 7. Largest battery size

Some applications demand high-energy storage. In that case, the largest lithium battery sizes are the best option. This application may include electric vehicles, industrial backup power, or renewable energy storage systems. So, large-sized batteries are designed using lithium chemistries so that their battery life and performance can be increased.

Ufine’s largest lithium battery

Ufine is providing an extensive range of lithium batteries. These include the largest size lithium battery, i.e., 48V 100Ah LiFePO4 battery. This battery has high capacity and is specifically built for demanding applications that need reliable and long-lasting power sources.

So, here are some notable features of Ufine’s 48V 100Ah LiFePO4 battery;

Have stable chemical and thermal properties, so the combustion risk is reduced.
Durable and have a long lifespan through multiple charge cycles.
Offers steady voltage for consistent power delivery.
Eco-friendly, non-toxic, and best for sustainable use.
Have a fast charging cycle to reduce downtime.

Part 8. Smallest battery size

As we discussed earlier, large-size batteries are used for high-energy applications. So, the smaller lithium batteries are useful for IoT devices, wearable technology, and compact electronic devices. They provide sufficient power in small form factors. That enables the development of portable and lightweight gadgets.

Ufine’s smallest battery size

If we particularly talk about Ufine’s small-size lithium batteries, they offer a range of compact lithium batteries. This includes their smallest size lithium battery – the 3.7V 300mAh lithium-ion battery. Although it comes in a small size, it is considered an act of punch as it provides reliable power for several low-power applications.

Ufine’s Smallest Size Lithium-ion battery

So, here are certain features of Ufine’s 3.7V 300mAh lithium-ion battery.

It works well even at -40oC, so it is ideal for extreme environmental conditions.
Provides consistent power to several electronics.
It has a long lifespan. So, it is cost-effective
Protects against overcharging or short circuits.

So, it is a perfect fit for electronic appliances that need less power.

Part 9. Custom lithium battery sizes and packs

Standard sizes may not suit all applications. Custom battery packs can be tailored to meet exact performance, size, and durability requirements.

When to Go Custom:

Limited space or unique shape constraints
Specialized devices like GPS trackers or industrial sensors
Enhanced discharge rate or high-temperature performance

This is where Ufine Battery can support your projects.

Ufine Battery is a leading Chinese custom lithium battery manufacturer specializing in:

Lithium polymer (pouch) batteries
LiFePO4 batteries
18650 and other cylindrical formats
Ultra-thin, high-rate, and high-temperature lithium batteries

With Ufine, you can request custom voltages, capacities, shapes, and sizes tailored for your application. Whether you need compact battery cells for consumer electronics or large packs for industrial use, Ufine Battery offers reliable design, prototyping, and manufacturing services.

Contact Ufine Battery today to discuss your custom battery needs and get expert guidance.

Part 10. Lithium battery size comparison chart

Form Factor	Size Example	Voltage	Capacity (Range)	Common Usage
Cylindrical	18650	3.6V–3.7V	1800–3500 mAh	Laptops, tools, flashlights
Prismatic	103450	3.2V–3.7V	2000–30000+ mAh	Energy storage, power banks, UPS, EVs
Pouch (Lipo)	Custom	3.7V	100–5000+ mAh	Drones, wearables, RC models
Button Cell	CR2032	3V	200–240 mAh	Remotes, IoT sensors
Large Format	32650, Custom	3.2V–3.7V	5000–10000+ mAh	E-bikes, energy storage

This table is a quick reference for selecting a battery size that aligns with your voltage, energy, and physical constraints.

Part 11.FAQs

Which are the most common lithium-ion battery sizes for electronics?

The most common lithium battery sizes for electronics are 18650, 21700, and lithium polymer pouch cells.
Are lithium-ion battery sizes smaller than other types of batteries?

Yes, lithium battery sizes are generally smaller and lighter than those of traditional battery chemistries like lead-acid or nickel-metal hydride.
Can lithium battery sizes affect device performance? How?

Yes. So, choosing the right Lithium Battery Size is important because it can affect the device’s runtime, power output, and overall performance.
What are the standard dimensions for lithium battery cells used in electric vehicles?

Several standard sizes, such as 18650 and 21700, are commonly used in electric vehicle battery packs.
How do I choose the right lithium battery size for my application?

Go through the factors such as required capacity, physical space available, voltage requirements, and weight restrictions. Then, select a suitable lithium battery size for your application.
What safety measures should be taken when using lithium batteries of different sizes?

Safety is important when handling lithium batteries. So, always follow manufacturer guidelines and avoid physical damage. Moreover, appropriate charging and storage practices should be used to control the risk of fire or explosion.