Need reliable, long-lasting power? The 21700 5000mAh battery is here to deliver! With its high capacity, it powers up electric vehicles, power tools, and flashlights for longer use and fewer charges. Compact yet powerful, this battery strikes the perfect balance between performance and portability. Upgrade to 21700 5000mAh for next-level power!
The meaning of 21700 battery is actually usually a cylindrical battery with an outer diameter of 21mm and a height of 70.0mm. Nowadays, this model is used by companies in Korea, China, the United States and many other countries. Currently, there are two models of 21700 batteries commonly sold by popular a little bit, which are 21700/4200mAh and 21700/3750mAh. there are 21700/5000mAh with larger capacity coming online soon.
Higher Capacity: The 5000mAh rating means the battery can hold more charge compared to other 21700 variants with lower capacities, making it suitable for devices with higher power demands or those requiring longer operation times.
These batteries are commonly used in electric vehicles (EVs), power tools, flashlights, vaping devices, and energy storage systems, where higher capacity and longer usage times are essential.
Battsys (Stock Code: 837375) has been focusing on customized 21700 battery and battery pack solutions for 17 years, and supports OEM customization for fast shipment. Its two brands are “BATTSYS” and “FULLRIVER”.
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Learn MoreWith its high capacity, excellent energy density and long life, the 21700 battery is widely used in a variety of fields. It is widely used in electric vehicles to provide longer endurance for vehicles; in power tools, it supports high-power devices to achieve longer usage time; in energy storage systems, 21700 batteries are used in household energy storage devices such as solar energy to ensure stable energy supply. In addition, it is also suitable for consumer electronics products, such as high-end flashlights and portable power supplies, bringing more reliable range performance to the devices.
1.21700 type battery energy density is higher than the 18650 type battery that we know, the number of single battery in use can be greatly reduced, and the cost will be reduced after forming a group. A 18650 battery capacity is 2600-3600 mAh or so, a 21700 battery supports more than 4000 mAh, currently on the market has appeared 21700 5000mAh. while the capacity is larger, more and more beneficial to extend the life of modern equipment.
2. Rechargeable battery single volume increased by 35%. Tesla car production of 21700 rechargeable batteries, for example, from 18650 to 21700, the energy of a single battery can be increased by 34.8ah, an increase of 35%.
3. The net weight of the system software is estimated to decrease by 10%. The total capacity of 21,700 or more, along with the increase of single volume, the single energy ratio increases, the total number of batteries required under the same kinetic energy can be reduced by about 1/3, the total number of metal components and electrical components selected for the battery pack can be reduced by the difficulty factor of the management information system.
The 21700 cell is a lithium-ion battery named after its dimensions: 21 mm in diameter and 70 mm in length. Compared to the common 18650 cell (18 mm in diameter and 65 mm in length), the 21700 cell is larger and therefore typically has higher capacity and better energy density.
The lifespan of a 21700 cell depends mainly on its cycle count and specific usage 21700 cells usually have a cycle life between 800 and 1000 cycles. For example, the 21700 cells introduced by BATTSYS have a charging and discharging cycle life of 1,000 cycles, while 21700 cells from other brands may only have a cycle life of 800 cycles.
The lowest voltage of 21700 battery is 2.5V. This is the discharge termination voltage of 21700 battery, when the battery voltage drops to 2.5V, it means that the battery has been fully discharged and should not be used further to avoid damage to the battery
Avoid overcharging, deep discharging, and high-temperature operations to prolong battery life. Use a smart charger, ensure the cut-off voltage is appropriate, avoid frequent deep discharges, and periodically recharge unused batteries to prevent capacity degradation from self-discharge.
As lithium-ion batteries, 21700 batteries can be recycled through proper recycling channels. Materials such as lithium and nickel are recyclable, making formal recycling both environmentally friendly and effective in reducing waste.
With its high capacity and long cycle life, the 21700 battery is well-suited for energy storage applications, such as home solar storage systems. However, it’s best to select models with overcharge and discharge protection to ensure safety and stability over prolonged use.
Charging time depends on the battery’s capacity and charger specifications. Generally, a 3000-5000mAh 21700 battery takes around 3-5 hours to fully charge at a standard 1A to 2A current. With fast-charging modes, it could be reduced to 1-2 hours, but ensure the battery supports fast charging to avoid overheating.
The 21700’s larger size enables higher energy density and discharge efficiency, making it ideal for high-power applications like power tools and electric vehicles. Its improved internal structure reduces internal resistance, maintaining stable power output even under heavy loads.
Here’s a comparison of 21700 and 18650 batteries with a fresh perspective on "system optimization" and "evolution in battery architecture," offering unique insights while maintaining accuracy:
1. System Optimization
The increased capacity of the 21700 battery, due to its larger size, not only boosts individual energy storage but also enables system-level optimizations. In applications like electric vehicles and large energy storage systems, fewer 21700 cells are required to meet the same energy demand compared to 18650 cells. This reduction in cell count allows for a simplified Battery Management System (BMS) with fewer connection points, which in turn reduces potential failure risks. For systems relying on extensive battery arrays, each reduced connection point decreases the chance of malfunctions, enhancing overall system reliability.
2. Evolution in Battery Architecture
The 21700 battery is not merely an enlarged 18650; it represents a structural evolution designed to improve electrochemical stability, allowing it to maintain thermal balance even in a larger size. This stability enables the 21700 to manage sustained high-power discharge more safely, whereas 18650 batteries often require additional cooling mechanisms to maintain safe temperatures. This architectural advancement means that 21700 cells can handle higher current output, making them suitable for high-power applications that demand durability and heat tolerance.
3. Charge-Discharge Management and Efficiency
The 21700 battery demonstrates a slower internal resistance increase over repeated charge cycles, leading to better energy loss management compared to 18650 batteries. This low-loss characteristic makes the 21700 highly efficient in high-frequency charging and discharging scenarios, providing stable output over time and extending its operational lifespan. With lower resistance and more consistent performance, the 21700 battery reduces the need for frequent recharging, especially beneficial for devices with heavy power demands.
These benefits—system simplification, architectural stability, and efficient charge-discharge management—make the 21700 battery an optimal choice for applications requiring high density, enhanced stability, and streamlined system design.
1. Application-Specific Optimization
Different applications place unique demands on 21700 battery performance, so it's essential to match the battery to the "load characteristics" and "operational environment" of the device. For instance, in power tools, which require short bursts of high power, a 21700 battery with excellent high-discharge capabilities is ideal. Conversely, for low-power electronics with continuous operation, choose a model with low internal resistance and high cycle life to avoid power loss and excessive heating over prolonged use. This tailored approach helps maximize both battery and device longevity.
2. Material and Structural Variations
While 21700 batteries share standardized dimensions (21mm x 70mm), brands vary significantly in materials and design. Premium models use stable cathode materials and enhanced electrolytes, reducing the risk of internal expansion and performance loss at high temperatures. For extreme environments (e.g., high or low temperatures), select models designed with high-temperature stability or low-temperature adaptability to ensure consistent performance and safety.
3. Battery Management System (BMS) Compatibility
Selecting a 21700 battery should consider its compatibility with the device’s Battery Management System (BMS). Some high-performance models include protection chips that optimize charging by monitoring temperature, preventing overcharging, and minimizing performance decay during frequent charges. Ensuring compatibility between the battery’s protection protocols and the device’s BMS prevents issues like sudden shutdowns or undercharging, which could otherwise impact performance.
4. Energy Density and Thermal Efficiency
While 21700 batteries are known for high energy density, their thermal efficiency is equally critical. For high-discharge applications like electric bikes, it’s best to prioritize models with strong thermal management designs. On the other hand, for intermittent-use devices, a model with higher energy density will maximize run time. Assessing thermal efficiency relative to usage patterns ensures the battery won’t suffer capacity loss or pose safety risks due to overheating.
5. Cycle Life and Total Cost Analysis
Though higher-cycle-life 21700 batteries come with a steeper initial price, they may lower long-term costs in high-usage scenarios. For instance, in storage systems with frequent cycles, a 21700 battery rated for 5,000 cycles reduces replacement frequency and distributes costs over time. Analyzing the "cost-per-charge" metric rather than just upfront costs can help identify batteries with better long-term value.
6. Brand Quality and After-Sales Support
Quality and testing standards vary widely among brands, making it essential to choose a reputable brand with reliable quality certifications. Select batteries that comply with international safety standards, and consider the brand’s after-sales and technical support. For multi-battery systems, dependable after-sales service ensures quick resolution of issues, minimizing downtime and maintaining operational efficiency.
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