VTC-INR21700-3S5P 11.1V 25Ah Li-ion Battery Pack for portable power stations, solar lighting systems, robotics power modules
| Parameter | Specification |
|---|---|
| Model | VTC-INR21700-3S5P |
| Battery Type | Cylindrical Li-ion Battery Pack |
| Pack Structure | 3S5P (21700 cells) |
| Nominal Voltage | 11.1V |
| Nominal Capacity | 25.0Ah (at 0.2C) |
| Energy Density | 277.5Wh |
| Max Charge Voltage | 12.6V |
| Standard Charge/Discharge Current | 5A (0.2C) |
| Maximum Discharge Current | 10A |
| Discharge Cut-off Voltage | 8.25V |
| Internal Impedance | ≤120mΩ |
| Over-current Detection | 20±3A |
| Cycle Life | ≥800 cycles (to 70% @ 0.2C) |
| Weight | 1.2kg |
| Dimensions (Max) | 66.0 * 76.0 * 110.0mm |
| Operating Temperature (Discharge) | -20°C to 60°C |
VTC-INR21700-3S5P 11.1V 25Ah Cylindrical Li-ion Rechargeable Battery Pack Manufacturer in China
The VTC-INR21700-3S5P is an 11.1V 25Ah Li-ion battery pack built with a 3-series, 5-parallel cylindrical 21700 cell structure for equipment that needs a compact 277.5Wh rechargeable power source. According to the product specification, the pack provides 25.0Ah nominal capacity when discharged at 5A to 8.25V, 24.5Ah minimum capacity, 12.6V maximum charge voltage, 5A standard charging current, 10A rapid charge current, 5A standard discharge current, and 10A maximum discharge current. The maximum pack dimension is 66.0*76.0*110.0mm, with internal impedance of no more than 120mohm and an approximate specification weight of 1.2kg. The protection circuit information lists an S8254AAV protection IC, six 4407 MOSFETs, over-charge, over-discharge, over-current, short protection, and 70°C overheat protection. VTCBATT can support this Li-ion battery pack through factory supply, sample development, connector and wire customization, protection circuit matching, labeling, OEM/ODM battery pack design, wholesale supply, and stable batch production for qualified equipment manufacturers and distributors.
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.
21700 3S5P Core Structure (21700 3S5P Structure)
High-capacity cylindrical lithium-ion battery pack specifically designed for enclosed equipment power systems. Utilizing a 3-series 5-parallel (3S5P) configuration of high-quality 21700 cells, it not only optimizes space utilization but also provides sustained and stable power output (Nominal Capacity 25Ah, Rated Energy 277.5Wh).
Reliable Protection Circuit Design (Protection Circuit Design)
Features a high-standard built-in protection board (BMS) with an S8254AAV protection IC and six 4407 MOSFETs on the PCBA. This provides comprehensive protection against overcharge, over-discharge, overcurrent, and more, ensuring the safe operation of both the battery pack and the equipment.
Controlled Working Current
Boasts excellent current-carrying capacity, supporting 5A standard charging/discharging, and allowing for up to 10A rapid charging or maximum discharge current, flexibly meeting the power requirements of various application scenarios.
Comprehensive Factory Customization Support (Custom Pack Support)
Offers professional and flexible customization services, fully supporting personalized modifications for connector terminals, wire specifications, exterior labels, and protection circuits. This perfectly covers all needs from initial sample prototyping to full-scale mass production.
21700 Lithium ion Battery Advantage
This 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.
This 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.
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°C and 35°C, indicating minimal heat accumulation during prolonged standard operation.
Similar 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.
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.
This chart shows the low-temperature discharge energy performance of the 21700 high-rate lithium battery at -20°C.
Despite the increased internal resistance under cold conditions, the cells maintain stable energy output during the
20A high-rate discharge, delivering approximately 11.5 to 11.8 Wh. The results demonstrate reliable cold-weather
performance and strong high-current discharge capability.
The 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.
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
This 11.1V 25Ah cylindrical lithium ion battery pack is suitable for medium-capacity portable equipment such as portable power stations, solar lighting systems, robotics modules, industrial monitoring devices, backup power units, electric sprayers, portable medical devices, and emergency lighting packs where a 3S rechargeable pack, 12.6V charger compatibility, 277.5Wh energy, and controlled 5A to 10A working current range are appropriate. Its 66.0*76.0*110.0mm maximum dimensions make it practical for enclosed battery compartments, and the listed protection IC, MOSFET design, over-current threshold, short protection, and temperature protection support safer integration into finished devices when the pack is used within the datasheet limits. VTCBATT provides application-specific customization for brand owners, equipment factories, and battery wholesalers, including connector matching, cable length adjustment, NTC or protection circuit configuration when required by the project, PVC label customization, sample testing support, and factory-direct batch production for custom lithium battery pack programs.
