Product Features:
High Discharge Rate
High Temperature Resistance
Excellent Cycle Performance
Fast Charging
Application Areas:
Electric Two-Wheelers
Electric Scooters
Electric Balance Scooters
Electric Motorcycles
Mobility Scooters
Mobile Power Banks
Small-Scale Energy Storage
Outdoor Power Stations
Parameter：
| Cell's Materials | Pure Ternary 811 |
| Dimension (mm) | Height: 70.8±0.2mm |
| Diameter: 21.7±0.15mm | |
| Nominal Voltage (V) | 3.6V |
| Nominal Capacity (Ah) (0.2c) | 5000mAh |
| Internal Resistance (mΩ) | ≤22mΩ |
| Weight | 69.5±1g |
| Max Discharge Rate | 5C |
| Max Charge Rate | 1C |
| Cycle life (DOD 80% 25℃) | Charge:0.5C, Discharge:3C≥800 cycles Charge:0.5C, Discharge:1C≥1000 cycles |
| Operating Temperature(Cell Surface) | Charge: 0~45℃ Discharge: -10~60℃ |
Engineered for high-performance e-mobility and portable energy systems, the Joinsun INR21700-50D High Discharge 21700 Battery delivers superior power, stability, and long-term reliability. Whether for electric scooters, e-bikes, or outdoor power stations, this cell ensures consistent performance even in demanding conditions.
Product Differentiation/Why Choose Joinsun:
01
Source Factory
With comprehensive services and quality assurance, employing cutting-edge technology and high-end materials to provide a longer average lifespan.
02
Professional Team and Advanced Production Equipment
A research and development team of over 30 people with 24 related patents. The company covers an area of 100 acres, equipped with 8 advanced coating production lines, 3 fully automated injection lines, 10 sets of fully automatic sheet winding machines, 6 fully automatic integrated welding production lines, etc., meeting the production capacity demand of 20GWh per day, ensuring product efficiency and quality.
03
Sales Network and Services
Jixin Technology has established offices in East China, South China, and an overseas affairs department, with sales networks gradually expanding to cover the Middle East and Southeast Asia regions. Striving to become a leading supplier in the power battery and energy storage lithium battery markets, providing comprehensive service and support.
04
High Cost-Effectiveness
Joinsun products provide high value for their cost.
05
In-House Manufacturing
Full control from cell design to pack assembly, ensuring quality consistency.
06
Advanced R&D
Continuous innovation in high-energy NCM 811 chemistry.
07
Certified Quality
Compliant with CE, UN38.3, MSDS, and IEC standards.
08
Customization Available
OEM / ODM labels, pack design, and performance tuning supported.
09
Global Support
Responsive sales and technical teams serving clients worldwide.
10
Reliability & Safety
Each INR21700-50D cell undergoes strict testing for capacity, internal resistance, high-temperature stability, and cycle consistency.
Joinsun batteries feature integrated protection design, stable impedance, and excellent thermal control, minimizing safety risks under continuous load.
Industrial Packaging That Can Be Customized According to Requirements.
* Warranty Policy: Provide warranty and replacement service within a certain period of time to ensure the interests of customers.
* Important Notes: Please strictly follow the instructions provided in the product manual.
Joinsun INR21700-50D cells are widely used in:
● Electric Scooters & Motorbikes – High-discharge performance for fast acceleration and stable power delivery.
● Portable Power Stations – High capacity and cycle life support extended outdoor operation.
● Light Electric Vehicles (LEVs) – Reliable power output under varying load and temperature.
● Energy Storage Systems – Stable operation, long lifespan, and easy integration.
Q1: What makes INR21700-50D different from 18650 cells?
A: It offers 30–40% higher capacity, higher discharge rate, and improved thermal performance.
Q2: Can I use it in custom battery packs?
A: Yes, we provide full pack integration and BMS matching service.
Q3: What is the warranty policy?
A: 12-month warranty or 800 cycles (at 80% capacity retention), whichever comes first.
Q4: Is customization available?
A: Absolutely — labeling, packaging, and performance specs can be tailored to your needs.
Optimize your project with high-performance INR21700-50D cells. Contact our team for technical consultation or download the detailed datasheet now.
Customer Feedbacks
JOINSUN battery packs a powerful punch. lt has never failed to provide enough energy to keep our devices running smoothly. From our smartphone to my portable speakers, this battery has got it covered.
Jacob
JOINSUN has provided us with customized lithium battery solutions for our energy storage systems. Their batteries are UL and CE certified, ensuring safety and reliability. Fast shipping and great customer support!
John
We needed custom lithium battery packs for our electric bikes, and JOINSUN delivered exactly what we wanted. Their R&D team helped optimize the design, and the production was quick. Definitely our go-to supplier for long-term cooperation!
Sarah
We've been sourcing 18650 and 21700 battery packs from JOINSUN for over a year. The battery quality is excellent, with stable performance, high capacity, and long cycle life. Their team is very professional and responsive. Highly recommended!
Michael
Other Products
High Discharge Rate
High Temperature Resistance
Excellent Cycle Performance
Fast Charging
High Energy Density
Stability
Lightweight
Lower Discharge Rate
5C High Rate Continuous Discharge 8C High Rate Non-Continuous Discharge Power Tools and Electric Garden Tools 21700 Lithium Cells CE, UL 1642, FCC, IEC 62619, CB, BIS, PSE, 3C (CCC)
High Discharge Rate
High Temperature Resistance
Excellent Cycle Performance
Fast Charging
News
Company News
2025.12.02
Company News
2025.11.25
Company News
2025.11.19
Company News
2025.11.13
Company News
2025.11.07
2025.10.29
