Nuwon Energy
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| Product Name | High Rate 70A Low-temp -40°C 21700 RS50 Cylindrical Lithium Ion Cells 3.7v 5000mAh INR21700 Li Ion 21700 Battery |
| Voltage | 3.7v ,customized |
| Capacity | 5000mah OEM/ODM |
| Discharge Current | 1A-60A OEM/ODM |
| Wide Temp Range | Optional: can be used from -40°C to +85°C. Supports discharge at -40°C and Charging at -20°C |
| OEM/ODM Solutions |
• 18650 21700 26650 32650 32700 battery cells • 1S 2S 3S 4S 6S 8S, etc. format solutions • BMS, cable, connector, case customization |
| Features | Low internal resistance, low self-discharge, no memory effect, eco-friendly |
| Cycle Life | ≥80% capacity after 500 times |
| Certification | CE, MSDS, UN38.3, EMC, UL |
| Package | Individual package as required |
| Warranty | 12 Months |
| Application | Widely used for Lighting, Electric Toys, Power Tools, Cash Machine, POS Terminal, Loudspeaker, Mine Equipment, Speaker, GPS Tracker, Car Video-Registry, Stand-Alone Telemechanic System, GSM Modem, etc. |
Model: New INR21700 RS50 battery cell.
★ All cells will be strictly matched (voltage, capacity, resistance) before delivery.
* All batteries undergo multiple test rounds before shipping to guarantee top-tier quality, full capacity, matched voltage, and calibrated internal resistance.
Our complete testing procedure is illustrated below. Please reach out to us if you have any questions regarding our Quality Control measures.
Please share your detailed specifications with us to receive a fast, tailored quote:
Customized 18650 lithium battery pack (Custom Case):
• Customized voltage options: 3.7v, 7.4v, 11.1V, 14.8v, 22.2v, etc.
• Customized capacity options: 2000mah to 200ah, etc.
We provide a comprehensive range of custom designs for lithium-ion, lithium polymer, primary lithium, and nickel-metal hydride (NiMH) batteries. We work closely with top-tier global cell manufacturers to deliver stable, high-performance power solutions.
Dimensions and form factors can be adjusted to fit the specific housing limitations of your devices. We accommodate unique sizing requirements for applications ranging from compact electronics to heavy industrial equipment.
We design custom BMS units featuring tailored charge/discharge currents, voltage thresholds, cell-balancing logic, and communication protocols (CANbus, SMBus, I2C, Bluetooth, etc.) to optimize battery safety and longevity.
Batteries are available with a wide array of connection terminals, including standard PC pins, solder tabs, flying leads, custom wire harnesses, and specific brand connectors (JST, Molex, Amphenol, etc.). Custom terminations can be manufactured to match your exact hardware requirements.
Explore our catalog of certified, high-performance battery cells and packs designed for diverse industrial applications.
Benefiting from 15 years of industry experience, we serve customers across 38 countries, maintaining a high repurchase rate and consistent on-time delivery.
All battery cells are 100% original, brand new, and Grade A. We manage freshly manufactured weekly stocks to ensure long-term, stable supply lines for your projects.
Every battery is fully tested and verified for voltage and internal resistance matching prior to shipment. Customers are welcome to request video inspections before dispatch.
Full technical support and after-sales service are guaranteed. We offer replacements or refunds if cell quality deviates from specified parameters.
From LiFePO4 to Li-polymer battery pack assemblies, we construct customized power solutions tailored exactly to your design parameters.
Using advanced assembly equipment and design methodologies, we specialize in high-quality lithium iron phosphate (LiFePO4) batteries, energy storage battery packs, and portable power systems. Our product portfolio spans Cylindrical, 12V, 24V, 36V, and 48V battery pack configurations.
These solutions are engineered for demanding applications including Electric Surfboards, E-bikes, Home Energy Storage Systems, RVs, Marine power, UPS setups, Telecom base stations, and Solar Energy grids.
Our quality control frameworks ensure our production processes align with strict international standards, backed by a collaborative R&D team and certified facility inspections.
All battery offerings hold required international certifications including UL, CE, ROHS, CB, UN38.3, MSDS, IEC, and ISO9001.
A: Yes. All of our cells are Grade A, brand new, and come with their QR codes intact.
A: Yes. We measure and record each individual battery's voltage, internal resistance, and capacity before packing.
A: Yes. Our batteries include standard matching busbars and nuts (e.g., purchasing 4 cells includes 4 busbars and 8 nuts). Please contact us directly if you require additional accessories.
A: We offer a 5-year warranty for LiFePO4 batteries and a 3-year warranty for NMC batteries. In the event of non-human structural issues, we provide refunds or replacement cells upon verification of photos or videos.
A: Cells are securely wrapped in thick PE protective foam blocks and shipped inside robust, 5-layer drop-resistant export cartons.
A: We offer Train/Sea DDP shipping, express courier services, and can coordinate directly with your appointed freight forwarders.
Please send us an enquiry with your specifications, and we will get back to you shortly.
