VTC INR21700-1S4P 3.6V 20.8Ah Li-ion Battery Pack for Industrial Instruments, IoT Gateways, Security Equipment
| Parameter | Specification |
|---|---|
| Model | VTC INR21700-1S4P |
| Battery Type | Cylindrical Lithium-ion Rechargeable Battery Pack |
| Configuration | 1S4P |
| Nominal Voltage | 3.6V |
| Nominal Capacity | 20.8Ah, discharge at 0.2C to 2.5V |
| Rapid Charging Current | 0.3C (6.24A) |
| Standard Discharging Current | 0.1C (2.08A) |
| Weight | 300g |
| Pack Dimensions | 45*60*75mm MAX. |
| Cycle Life | ≥500 cycles to 70% capacity at 0.2C charge |
| Protection IC | R5478N101CD |
| MOSFET | dp8205, 2 pcs |
VTC-INR21700-3S5P 11.1V 25Ah Cylindrical Li-ion Rechargeable Battery Pack Manufacturer in China
The VTC INR21700-1S4P is a 3.6V 20.8Ah cylindrical Li-ion rechargeable battery pack built from a 1S4P 21700 cell configuration for equipment that needs higher single-cell capacity in a compact pack format. The datasheet specifies 20.8Ah nominal capacity, 20.4Ah minimum capacity, 4.2V maximum charge voltage, 2.5V discharge cut-off voltage, 0.1C standard charge/discharge current, 0.3C rapid charge and maximum discharge current, internal impedance of no more than 100mOhm, and maximum dimensions of 45*60*75mm. The pack includes PCM protection using an R5478N101CD protection IC and two dp8205 MOSFETs, with over-charge, over-discharge, over-current, and short-circuit protection parameters defined in the source specification. VTCBATT can supply this Li-ion battery pack for factory-direct projects with connector matching, wire configuration, labeling, sample testing, OEM/ODM development, wholesale orders, and stable batch production support based on the customer device structure.
Full Certification & Extended Warranty
VTCBATT Lithium ion batteries meet global certifications including CB, CE, UL, and UN38.3, and offer a 14-month warranty—two months longer than standard—to maximize customer confidence and profit.
CertificationVTCBATT lithium ion batteries have passed numerous important international certifications, including UL1642, IEC62133, UN38.3, CE, ROHS, BIS and EU2024/1542, CE, ROHS, REACH, and KC certifications.
WarrantyVTCBATT Lithium ion batteries come with a 14-month warranty, 2 months longer than the standard 12-month warranty, providing extra coverage for shipping and customs clearance. This ensures customer confidence.
CustomizationDifferent sizes,capacities, connectors, discharge rates,and cases. Just inform us of your specific requirement, and our professional engineers can provide you with the customized Lithium ion battery proposal.
Flexible order quantity to support prototype testing and mass production.
Our technical and sales teams reply to your inquiry within 6 hours.
Test our lithium battery quality and performance before placing bulk orders.
Batteries certified to UL, CE, UN38.3, MSDS, ROHS, IEC62133, and more global standards.
Connector-Ready OEM Assembly
High-Capacity 1S4P Power Pack
Integrated Protection Circuit
The datasheet defines PCM protection using an R5478N101CD protection IC and two dp8205 MOSFETs for pack-level electrical protection functions.
Stable Operation Across Temperatures
The source specification defines charge operation from 0°C to 45°C and discharge operation from -20°C to 60°C with current limits by temperature range.
Why Choose VTCBATT?
VTCBATT not only focuses on customised designs and excellent service to meet the diverse requirements of various customers, but also dedicates itself to precise and uniform manufacturing throughout all processes to ensure the highest quality batteries. Simultaneously, VTCBATT provides comprehensive support from pre-sales to after-sales, placing emphasis on customer feedback to build long-term, mutually beneficial cooperative relationships. VTCBATT’s professional sales team and technical engineering team stand ready to support you as your premier custom battery specialists, delivering reliable and prompt service at all times.
From the raw materials mixing to the cell test, VTCBATT adopts an automatic manufacturing process to maximize production efficiency and enhance the batteries quality, safety, and reliability. The entire manufacturing process is monitored and 100% tested before flowing to the next procedure to ensure zero defects before delivery.
Over the past 20 years, VTCBATT has built strong partnerships with customers in more than 50 countries worldwide. With reliable quality, responsive service, and tailored battery solutions, we have earned the trust of our clients—many of whom have maintained long-term cooperation and lasting friendships with us for over a decade. Together, we continue to grow and move forward toward a brighter future.
Application for 3.6V 20.8Ah Li-ion battery pack
This 3.6V 20.8Ah Li-ion battery pack is suitable for medium-capacity portable and embedded devices such as industrial handheld terminals, remote monitoring sensors, smart security equipment, IoT gateway backup modules, access control units, compact lighting controllers, data loggers, and custom electronics that need a rechargeable 1S battery source with pack-level protection. The 1S4P 21700 format provides higher capacity than a single cylindrical cell while keeping the voltage platform simple for compatible low-voltage power systems, and the three-wire lead with connector supports equipment assembly and service-friendly installation. For manufacturers, distributors, and device brands, VTCBATT can customize connector type, wire length, NTC or signal-wire configuration when required, PCM design, pack label, sample validation process, packaging, and battery wholesale supply for different enclosure and production requirements.
21700 Lithium ion Battery Test Report Curve
  Capacity Distribution of 21700 High-Rate Lithium Battery at 0.2C Discharge RateThis chart demonstrates the exceptional manufacturing consistency of VTCBATT cells. A remarkable 97% of the batch features a tightly clustered capacity between 4.060 Ah and 4.120 Ah, with the majority (69%) peaking at 4.080-4.100 Ah. This narrow distribution highlights strict quality control and highly reliable performance. |  Capacity Distribution of 21700 High-Rate Lithium Battery at 0.5C Discharge RateThis chart highlights the exceptional batch uniformity of VTCBATT cells even under higher loads. An impressive 97% of the batch delivered capacities tightly clustered between 3.960 Ah and 4.020 Ah, with a dominant 69% peaking at 3.980-4.000 Ah. This precise distribution guarantees predictable performance and strict quality control. |
 Cycle Life Energy Retention of 21700 High-Rate Lithium Battery at Normal Temperature (25 +/- 3 deg C)These VTCBATT cells demonstrate excellent long-term stability and outstanding thermal management. Over nearly 350 continuous 4A charge-discharge cycles, they maintain a strong energy retention rate of 85% to 90%. Additionally, surface temperatures consistently remain between 30 deg C and 35 deg C, indicating minimal heat accumulation during prolonged standard operation. |  Discharge Capacity Curve of 21700 High-Rate Lithium Battery at -20 deg CSimilar to the energy curve, the graph displays an initial sharp voltage drop (down to approximately 2.6V) due to the increased internal resistance characteristic of cold environments. This is followed by a distinct voltage recovery phase, peaking around 3.4V, which is caused by internal self-heating generated during the 20A continuous high-rate discharge. Following this peak, the voltage gradually declines until the cutoff. Under these demanding conditions, both battery samples successfully delivered a total discharge capacity of approximately 3.6 to 3.7 Ah. |
 Discharge Capacity Curves of 21700 High-Rate Lithium Battery at Different Rates (25 +/- 3 deg C)These VTCBATT cells exhibit exceptional high-rate discharge capabilities. While the initial operating voltage systematically drops from 0.8A to a massive 50A continuous load due to standard internal resistance, capacity retention remains outstanding. The total delivered capacity experiences only a minor decrease, shifting from over 4.0 Ah to approximately 3.7 Ah. |  Discharge Energy Curve of 21700 High-Rate Lithium Battery at -20 deg CThis chart shows the low-temperature discharge energy performance of the 21700 high-rate lithium battery at -20°C. |
 Discharge Energy Curve of 21700 High-Rate Lithium Battery at -20 deg CThe curves display an initial sharp voltage drop, which is typical for batteries operating in cold environments due to increased internal resistance. This is followed by a brief voltage recovery phase, likely caused by internal self-heating from the 20A high-rate discharge, before the voltage gradually declines. Under these conditions, both battery samples successfully delivered a total discharge energy of approximately 11.5 to 11.8 Wh. |
