Cylindrical Lithium-ion Battery Manufacturer | Custom 18650 & 21700 Battery Supplier
15+ Years Experience | OEM/ODM Support | UN38.3/UL/CE Certified
- 18650 Lithium-ion Cells
- 21700 High-capacity & High-rate Lithium Batteries
- High-drain Cylindrical Cells
- Custom Battery Pack Assembly Support
Blumoti is a professional cylindrical lithium-ion battery manufacturer in China specializing in 18650 and 21700 rechargeable lithium battery cells. With 15+ years of OEM/ODM experience, we provide reliable cylindrical cell solutions for power tools, e-bikes, electric scooters, portable energy storage, flashlights, cleaning devices, smart home products, medical devices, robotics, and industrial equipment.
Our cylindrical lithium-ion battery cells support:
- 3.6V / 3.7V platforms
- 18650 and 21700 standard formats
- 2000mAh–5600mAh capacity options
- High-capacity and high-drain cell options
- 1C / 2C / 3C / 5C / 10C discharge rate options
- Series and parallel battery pack assembly
- Customized BMS, PCM, wires, connectors, labels, and packaging
All products comply with UN38.3, CE, UL, KC, and RoHS certification requirements.
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![4000mah 10C 21700 Cylindrical Battery]()
4000mah 10C 21700 Cylindrical Battery● Model Number: 21700-40Pview more
● Capacity(mAh): 4000
● Nom.Voltage: 3.6V/3.7V
● Cathode: NCM
● Ddischarge Rate: 5C/10C
● Energy Density(Wh/kg):215 -
![5000mah 21700 Battery]()
5000mah 21700 Battery● Model Number: BMT21700-50Eview more
● Capacity(mAh): 5000
● Nom.Voltage: 3.6V/3.7V
● Cathode: NCM
● Ddischarge Rate: 3C
● Energy Density(Wh/kg):265 -
![21700 Battery 3.7V 5600mAh]()
21700 Battery 3.7V 5600mAh● Model Number: BMT21700-56Eview more
● Capacity(mAh): 5600
● Nom.Voltage: 3.6V/3.7V
● Cathode: NCM
● Ddischarge Rate: 2C
● Energy Density(Wh/kg):296 -
![18650 Battery 3.7V 2000mAh]()
18650 Battery 3.7V 2000mAh● Model Number: 18650-20Pview more
● Capacity(mAh): 2000
● Nom.Voltage: 3.7V
● Cathode: NCM
● Energy Density(Wh/kg):168 -
![2600mah 18650 Battery 3.7v Rechargeable]()
2600mah 18650 Battery 3.7v Rechargeable● Model Number: 18650-26Vview more
● Capacity(mAh): 2600
● Nom.Voltage: 3.7V
● Cathode: NCM
● Energy Density(Wh/kg):218 -
![18650 Battery 3.7v 3000mah]()
18650 Battery 3.7v 3000mah● Model Number: 18650-30Sview more
● Capacity(mAh): 3000
● Nom.Voltage: 3.7V
● Cathode: NCM
● Energy Density(Wh/kg):246 -
![3500mah 18650 Battery]()
3500mah 18650 Battery● Model Number: 18650-35Eview more
● Capacity(mAh): 3500
● Nom.Voltage: 3.7V
● Cathode: NCM
● Energy Density(Wh/kg):282
Why Choose Us
Global Delivery:
FOB/EXW/CIF | Sea/Air/DHL Supported
Discharge Rate Options:
1C / 2C / 3C / 5C / 10C cells available for different application needs
Certifications:
ISO 9001, ISO 14001, IATF 16949, UN38.3, CE, UL, BIS, KC
Product Coverage:
18650 and 21700 cylindrical lithium-ion cells, including high-capacity and high-drain options
R&D Support:
50+ engineers, 7 R&D teams for custom battery cell and pack solutions
Factory Capacity:
25,000㎡ workshop, 800 employees
Need Custom Lithium-ion Battery Pack for Your Project?
Discuss Your Battery Project
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Custom Cylindrical Lithium-ion Battery Pack Capabilities
Series & Parallel Configuration / Cell Model Selection / Capacity / Voltage / Discharge Rate / Connector / NTC / BMS or PCM Protection / Label / Certification
Features of Cylindrical Lithium-ion Batteries
Standardized Cell Formats
18650 and 21700 cylindrical lithium-ion cells feature standard sizes, mature manufacturing, stable structures, and strong compatibility.
High Capacity Options
Capacity options from 2000mAh to 5600mAh help support longer runtime for portable devices, electric tools, e-bikes, energy storage, and industrial equipment.
High-drain Performance
Multiple discharge-rate options, including 1C, 2C, 3C, 5C, and 10C, are available for applications requiring stable current output and stronger power performance.
Reliable Pack Assembly
Cells can be assembled in series and parallel configurations to meet customized voltage, capacity, size, and power output requirements.
Safety Protection Design
BMS or PCM protection, NTC, wires, connectors, casing, labels, and packaging can be customized according to project requirements.
Wide Application Compatibility
Suitable for power tools, e-bikes, electric scooters, portable energy storage, flashlights, cleaning devices, smart home products, medical devices, robotics, and industrial equipment.
Cylindrical Lithium Batteries Applications
1C–2C Standard Discharge
For flashlights, smart home devices, medical testing equipment, portable instruments, and backup power. Supports 1S–4S and multi-parallel pack designs.
2C–3C Medium-power Discharge
For e-bikes, electric scooters, cleaning devices, portable energy storage, and outdoor equipment. Supports 7.4V, 11.1V, 14.8V, 24V, 36V, and 48V battery pack customization.
5C High-drain Discharge
For power tools, garden tools, robotics, RC products, and high-power portable equipment. High-current wires and connectors are available for stable power output.
10C Ultra-high-drain Discharge
For professional power tools, electric drive systems, model devices, and industrial equipment requiring instant current output and peak-load performance.
Custom Pack Accessories
Available with BMS/PCM, NTC, balance wires, nickel strips, high-current silicone wires, JST, Molex, XT30, XT60, XT90, DC plug, Anderson, and customized terminals.
Knowledge Center for Cylindrical Lithium-ion Batteries
The two cell sizes are different — the 21700 is larger.18650 cells are mature and widely used for compact battery packs, while 21700 cells usually provide higher capacity and stronger power output. The right choice depends on your product size, runtime, power demand, and cost target.
Discharge rate affects how much current the battery can deliver. Standard 1C–2C cells are suitable for low-to-medium power devices, while 5C and 10C high-drain cells are better for power tools, robotics, electric drive systems, and other high-load applications.
Battery pack voltage is mainly determined by the series configuration, such as 1S, 2S, 3S, 4S, 10S, or 13S. Capacity can be increased through parallel design, such as 2P, 3P, or higher parallel structures, depending on the required runtime and available space.
Before starting a custom cylindrical lithium battery project, buyers should confirm cell model, voltage, capacity, discharge current, connector type, wire gauge, BMS/PCM protection, NTC requirement, size limit, certification, and shipping method.
Contact us for more connector options
FAQ
What cylindrical battery models do you supply?
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We supply 18650/21700/14500/26650/26800 cylindrical lithium-ion cells, including high-capacity and high-drain options for different applications.
Can you customize cylindrical lithium battery packs?
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Yes. We support series and parallel configuration, voltage, capacity, BMS/PCM, NTC, wires, connectors, labels, casing, and packaging customization.
What discharge rates are available?
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We provide standard and high-drain options, including 1C, 2C, 3C, 5C, and 10C cells, depending on the application and cell model.
What should I provide for a custom battery pack inquiry?
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Please provide voltage, capacity, size limit, working current, peak current, application, connector type, wire length, certification needs, and estimated order quantity.
Are your cylindrical lithium batteries certified for shipping?
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Our products can meet common certification and shipping requirements such as UN38.3, CE, UL, KC, BIS, and RoHS, depending on the product model and project requirements.
Shenzhen Blumoti Energy Co., Ltd. is one of the most experienced cylindrical lithium battery manufacturers and suppliers in China, also supports customized service. Please feel free to buy bulk high quality cylindrical lithium battery made in China here from our factory.
