Zenilove provides custom cylindrical battery products for small devices, including 18650 cells, 21700 cells, and cylindrical lithium battery packs. These batteries support power tools, medical devices, instruments, smart devices, and portable equipment that need stable output, compact structure, and reliable performance.
Six 4900mAh cells provide 10.8V, 9800mAh capacity, and 105.84Wh energy for compatible OEM and industrial equipment.
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Three 4900mAh 21700 cells provide 10.8V, 4900mAh capacity, and 52.92Wh energy in a compact pack.
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Three matched 21700 cells deliver 10.8V, 4900mAh, and 52.92Wh in a compact triangular arrangement.
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Protected 1S1P 18650 lithium-ion battery assembly with 2600mAh capacity and 9.36Wh rated energy.
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High-capacity 1S1P cylindrical lithium-ion cell with 3500mAh capacity and 12.6Wh rated energy.
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Compact 1S2P 18650 battery pack with 3.6V, 5200mAh capacity, and 18.72Wh energy.
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Three 18650 cells in a 1S3P configuration provide 3.6V, 7800mAh capacity, and 28.08Wh energy.
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Four parallel 18650 cells provide 3.6V, 10400mAh capacity, and 37.44Wh rated energy for portable devices.
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1S1P 21700 lithium-ion battery assembly with 4900mAh capacity and 17.64Wh rated energy.
View ProductChoose the application first, then match it with the right 18650 cell, 21700 cell, or cylindrical battery pack.
Portable electronics need a cylindrical battery that balances limited space, stable output, and practical runtime. A compact 18650 cell or small 18650 battery pack is usually the first direction to review.
18650 Cell/Compact 18650 Battery Pack
Better for compact internal battery compartments.
Useful when mature pack layout and stable output matter.
Works for smart devices, instruments, and portable electronics.
Quote focus: size limit, voltage, capacity, and connector.
Power tools need stronger output and longer runtime. A 21700 battery pack gives more room for capacity, while custom pack design can match tool housing, connector layout, and discharge requirements.
21700 Battery Pack / Space-Efficient Triangle Pack
Better when higher capacity and runtime matter.
Pack structure can support stronger output needs.
Triangle layouts can use limited internal space more efficiently.
Quote focus: discharge current, voltage, structure, and heat control.
Industrial equipment often needs a cylindrical battery pack designed around voltage, runtime, vibration, housing space, and stable power output. The final choice may use either 18650 or 21700 cells.
Custom 18650/21700 Cylindrical Battery Pack
Works for instruments, monitoring devices, and portable equipment.
Battery format should follow the load pattern and internal space.
Protection design should match the device operating environment.
Quote focus: load current, runtime, connector, protection board.
Medical devices need reliable output, stable performance, and careful protection design. A protected cylindrical lithium battery pack should be reviewed around testing, connector reliability, and charge-discharge behavior.
Protected Cylindrical Lithium Battery Pack
Stable voltage output supports device reliability.
PCM or BMS design helps reduce battery safety risk.
Connector and wire layout should match assembly needs.
Quote focus: safety needs, cycle use, testing and documentation.
Energy storage projects usually care more about capacity, pack structure, and long-term operation. A 21700-based pack can be a stronger direction when the design has enough space and needs higher energy output.
21700 Cell/21700 Battery Pack
Better direction for higher capacity needs.
Useful when runtime matters more than minimum size.
Can support a larger energy pack design.
Quote focus: capacity, cycle life, structure, quantity.
Mobility devices usually need longer runtime, stable discharge, and a battery pack structure that fits the product frame. A 21700 cylindrical battery pack is often the stronger direction when space allows.
21700 Cylindrical Lithium-ion Battery Pack
Better for runtime-focused mobility devices.
Pack structure should match the product frame and power demand.
The protection board and wiring layout need early review.
Quote focus: voltage, capacity, discharge current, casing.
We turn your voltage, capacity, size, connector, and application requirements into a clear custom cylindrical battery pack plan before sample and production.
Share the application, voltage, capacity, size limit, discharge current, connector, and quantity.
We review whether 18650 cells, 21700 cells, or a cylindrical battery pack structure fits the project better.
The sample plan covers pack structure, protection design, wire, connector, label, and assembly details.
After sample approval, we support production, testing, packaging, and shipment document preparation.
18650 batteries are more compact. 21700 batteries usually provide higher capacity and longer runtime.
Yes. Voltage, capacity, pack structure, connector, wire length, protection board, and label can be customized.
Please provide battery type, voltage, capacity, size limit, discharge current, connector, wire length, quantity, and application.
Yes. Power tools usually need stronger output, so 21700 battery packs or high-discharge cylindrical packs are often reviewed first.
The MOQ starts from 3,000 pieces.
Share your 18650 or 21700 project requirements with us. Our team can support custom cylindrical battery solutions for different application and performance needs.
Looking to contact a lithium battery manufacturer for your project? Our team provides a fast response, OEM & ODM support, and professional engineering consultation for custom battery solutions.
