21700 vs 18650: Size, Price & Battery Life Comparison

Battery performance and capacity are related. Given that it has a more significant ability and lasts longer, in the last article we already know that 18650 batteries are better than 26650.  Similarly, 18650 lithium-ion battery performs better in several ways than the 21700 batteries. This article will help you run down the different battery types and to purchase the battery that best suits you. Explore now!

18650 vs. 21700 batteries
18650 vs. 21700 batteries

Image Source: Utmel

Both 21700 and 18650 lithium batteries can be interchanged. The most crucial is battery voltage. The 21700-cell battery has a higher voltage than the 18650. Hence it’s used in different gadgets. Due to their likeness in appearance, the two are often compared:

  • Usability
  • Capacity
  • Battery life
  • Price
  • Longevity
  • Reliability
  • Weight

18650 vs 21700: What does the number mean?

18650 vs 21700 size
18650 vs 21700 size

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The dimensions of a lithium-ion cell are 21700, 18650, 20700, and others. These numbers indicate cell size. 18650 is the battery size. 18 is the battery’s diameter in millimeters. The following two numbers (65) indicate height, and the final (0) shows shape.

What does 18650 mean?

A 18650 lithium-ion battery. The name stems from the battery’s 18-millimeter by 65-millimeter size. It’s larger than an AA battery. 18650 batteries are 2600mAh to 3500mAh and 3.6 volts. MAH measures battery capacity. A 250 mAH, two mA battery lasts 125 hours. How a battery is discharged affects its longevity.

What does 21700 mean?

A 21700 battery has a diameter of 21 millimeters and a length of 70 millimeters. You’ve probably already deduced from that knowledge that a higher number corresponds to a larger battery cell. Wh = V x A x h. Since battery voltage is fixed owing to internal chemistry, only the Amps x hour measurement is written on the side.

Li-ion 21700 vs. 18650

What are 21700 batteries?

Rechargeable lithium-ion cells, known as 21700 batteries, are used to power various gadgets, including 21700 for flashlights and 21700 for vaping. According to Munro’s analysis, the 4680 new Tesla cell will be about 9000 mAH compared to the 5000 mAh of the 2170 cell. Tesla Model 3/Y Long-Range battery packs include 4,416 cells. In contrast, just 960 cells will be needed to fill the same space. This is because of the innovation that Tesla has over time.

Are all the 21700 batteries the same?

All 21700 batteries are different. Some lithium-ion cells are protected, whereas others aren’t. Most 21700 batteries are PCB- and overheat-safe. These safeguards prevent overcharging and overheating. Unprotected batteries are more harmful. 21700 batteries differ in construction and mAh. Some 21700 cells will be flat-top and others button-top. They have varying mAhs.

What are 18650 batteries?

18650 25.2V 214Ah battery pack
18650 25.2V 214Ah battery pack

Image Source: SunlyPower

Lithium-ion batteries transmit from the anode to the cathode, and ions and electrons flow. The anode oxidizes neutral lithium to Li+. Electrons from the anode reaction reduce Co(IV) to Co(III). These batteries power flashlights, tools, ebike battery, vaporizers, cameras, and laptops. High Drain batteries have a more significant current. Eighteen thousand six hundred fifty batteries may be charged 300-500 times and can be set in 3 hours.

Can I use 21700 instead of 18650?

The typical voltage and capacity range for 18650 batteries is 3.6/3.7V and 2,300–3,600 mAh. 21700 batteries were created to replace 18650 batteries with ones that were bigger and had more capacity. The nominal voltage of the 21700 is 3.6/3.7V, just like the 18650. The 21700 was created to replace 18650 batteries in EV battery packs. Compared to 18650 batteries, 21700 batteries have a higher density, which means they contain more usable energy. This allows your tools and equipment to be used for a more extended period.

Samsung 40t vs. Samsung 30q
Samsung 40t vs. Samsung 30q

Image Source: Battery Store

The discharge capacity of the two separate batteries is different, which is the simplest explanation for why this is the case.

  • The 30Q 18650 battery provides a continuous current of 15A.
  • The continuous current that can be delivered by the 30T 21700 is capped at 30A, whereas the maximum constant current that can be provided by the Samsung 40T 21700 with G3 PLUS is 35A.

Samsung’s 30T 21700 battery is for high-wattage vaping. The Samsung 30T has a smaller 3000mAh capacity but can discharge at 35A. This lets you run a 100W regulated mod while preserving battery life.

21700 battery vs. 18650: Difference between 18650 and 21700

SunPower’s 3.6V 15.6Ah 18650 Battery Pack and 1S3P 18650 SAMSUNG INR18650 33G 9300MAH 5A lithium-ion battery pack with XH2.54 both have the same Nominal Voltage of 3.6V and Voltage Range of 3-4.2V. However, SunlyPower’s battery pack is more compact and can be carried anywhere without feeling bulky.

21700 cells vs 18650

18650 and 21700 battery cells
18650 and 21700 battery cells

Image Source: Simpower

Compared to 18650 batteries, 21700 batteries are a tiny bit bigger. Both varieties have a flat top and a button top. Both are made up of lithium-ion. 21700 is better than 18650 in terms of its energy capacity and density. Measurements can help users choose the correct battery. 21700 has 50% more power and energy density than 18650 at 3.75C. Depending on cell structure, the 21700’s specific energy and energy density gains vary from 2% to 6%.

21700 vs 18650 weight

18650 vs. 21700 cell weight
18650 vs. 21700 cell weight

Image Source: Batterybro

The weight of 21700 batteries is approximately 60g, while the weight of 18650 batteries is about 48g. However, the importance of one can differ from another based on the specifications. This gives the consumer an overview as to what battery they will use according to the activity they will be doing. For example, 18650 is better for flying drones since it is lighter than 21700.

21700 vs 18650 size

18650 vs. 21700 cell size
18650 vs. 21700 cell size

Image Source: VTC Power

21700 batteries measure 70mm in length and 21mm in width, and 18650 batteries have dimensions of 65mm long and 18mm in diameter. The two varieties have very different sizes, with one being noticeably longer than the other. This is due to the different energy densities of the different types of batteries; the increased capacity of the 21700 lithium-ion battery allows it to have a larger size and a higher power output.

21700 vs 18650 capacity

18650 vs. 21700 capacities
18650 vs. 21700 capacities

Image Source: Research Gate

One of the most widespread varieties of lithium-ion batteries that can be recharged is known as the 18650. The capacity of the 21700 can reach up to 5000 mAH, whereas the power of the 21700 can range from 2600 to 3500 mAH. This suggests that the 21700 cylindrical li-ion cells have a higher energy density, which could result in longer runtimes for the device.

21700 vs 18650 battery life

18650 vs. 21700 cell life
18650 vs. 21700 cell life

Image Source: Takoma Batteries

The runtime of power tools powered by 18650 batteries is anywhere from 50 to 100 percent longer than that powered by 21700 batteries. The 21700 has a capacity of roughly 4000 to 6000mAh compared to the 18650’s 2600 to 3600mAh. As a result, the 21700 can go without charging for longer than the 18650. Knowing the life battery helps clients break down what cell can serve them for a long time.

21700 vs 18650 costs

18650 vs. 21700 cell cost
18650 vs. 21700 cell cost

Image Source: Tritek Battery

It is important to remember the disparity in cost between the two types of batteries; typically, 21700 batteries cost more than 18650 batteries. This is because the 21700 battery is more recent than the 18650 battery and has additional functions. When converted to a 21700 system, the 18650 system can cost 155 US dollars less. Samsung estimates a new 21700 battery can lower the system’s weight and components by 10% uses.

18650 vs 21700 vs 26650

26650 cell
26650 cell

Image Source: Large

26650 batteries are rechargeable lithium-ion cells. A 26650 battery is safe and efficient, making it suitable for high-powered LED torches. Yes, you may switch from 18650 and 26650 batteries.

21700 vs. 18650: Which is better?

Today’s market favors 186650 batteries because the 18650 is better since it is compact, light, versatile, and can be used in high-powered devices. Battery quality depends on the brand and battery manufacturer. So before purchasing a battery pack, consider these safety issues and you’d better order a 18650 battery from the manufacturer who supplies in bulk  for a batter price .


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