3.2V 40135 20Ah Lifepo4 Lithium Battery for Energy storage systems, solar battery systems, telecom base station backup, electric tricycles
| Model | LFP40135 |
| Voltage | 3.2V |
| Capacity | 20Ah (20000mAh) |
| Max Size (Thickness x Width x Length) | ∅40 mm × 135 mm（±0.2~0.5 mm） |
| Operating Temperature | -20~60℃ |
| Standard Charge Rate | 0.5C(Maximum 1C) |
| Standard Discharge Rate | 0.5C (Maximum 1C) |
| Weight | approx. 415 g ±10g |
Flexible order quantity to support prototype testing and mass production.
Batteries certified to UL,CE,UN38.3,MSDS,ROHS,IEC62133 and more global standards.
Customized size,current, case and working temperature.
7-10 days quick delivery.
Top 3.2V 40135 Cylindrical LFP Battery Cell Manufacturers in China
VTCBATT is a leading 3.2V 40135 cylindrical LiFePO4 battery cell manufacturer in China. The company has over 20 years of experience in lithium battery production. It focuses on high-performance 40135 20Ah LiFePO4 cells for industrial and energy storage applications. VTCBATT supplies batteries directly from the factory. It uses Grade A cells and automated production lines. This ensures stable quality and consistent performance. The cells deliver long cycle life, stable voltage, and high safety.
VTCBATT supports OEM and ODM customization. Customers can customize capacity, terminals, battery packs, and BMS (CAN, RS485, Bluetooth).
All products meet international standards such as UN38.3, MSDS, CE, and IEC. This ensures safe transportation and global use.
VTCBATT serves customers in over 50 countries. It provides reliable 40135 cylindrical LiFePO4 battery solutions for solar energy storage, backup power systems, robotics, and electric mobility.
Direct Current Resistance (DCR) Profile of 40135FS Battery Cells at 2C and 25°C
The provided image presents a comprehensive analysis of the Direct Current Resistance for 40135FS battery cells under 2C charge and discharge conditions at a constant temperature of 25°C. The upper section features two line graphs plotting the internal resistance in milliohms against the state of charge percentage. The left graph illustrates the discharge DCR profile, showing a gradual decline in resistance from 10% to 90% state of charge before experiencing a slight increase at 100%. Conversely, the right graph depicts the charge DCR profile, which is characterized by a high initial resistance at 0% state of charge that sharply drops and remains relatively stable up to 90%. Both graphs display data for two identical sample cells that exhibit perfectly overlapping performance curves, indicating high consistency. Below the graphical representations, a detailed data table explicitly enumerates the precise numerical values for both charging and discharging DCR at exactly 10% state of charge intervals, corresponding directly to the plotted data points above.
Voltage and Temperature Profiles of 40135FS Battery Cells During Fast Charging at Various Rates
The provided image displays four distinct graphs illustrating the fast-charging performance of two 40135FS battery cell samples, designated as 40135FS-1# and 40135FS-2#. These graphs capture the charging behavior at four progressive rates: 0.5C, 1C, 2C, and 3C. Each chart plots the charge capacity ratio on the horizontal axis against two separate vertical axes, with cell voltage on the primary left axis and surface temperature on the secondary right axis. Across all charging rates, the voltage profiles exhibit a characteristic curve, starting with a rapid initial increase, followed by a prolonged, stable plateau, and culminating in a sharp voltage spike as the cells reach 100% capacity. Conversely, the temperature profiles reveal a direct correlation between the charging rate and heat generation. While the temperature remains relatively flat and stable near room temperature during the slower 0.5C charge, it experiences a progressively steeper climb and reaches significantly higher peak values as the charging rate escalates to 3C. Notably, the data traces for both tested samples overlap almost perfectly in every scenario, indicating excellent manufacturing consistency and predictable thermal behavior between the individual battery cells under varying fast-charging conditions.
Voltage and Temperature Profiles of 40135FS Battery Cells at Various Discharge Rates
The provided image features four graphs detailing the rated discharge performance of two 40135FS battery cell samples (40135FS-1# and 40135FS-2#) tested at 0.5C, 1C, 2C, and 3C rates. Each graph plots the cell voltage on the primary left axis and the surface temperature on the secondary right axis against the discharge capacity ratio on the horizontal axis. Across all discharge rates, the voltage curves maintain a stable, flat plateau before experiencing a sharp decline as the cells reach 100% discharge capacity. Concurrently, the temperature profiles illustrate a steady thermal increase throughout the discharge process. As the C-rate increases from 0.5C to 3C, the rate of heat generation visibly escalates, resulting in steeper temperature climbs and higher peak temperatures at the end of the discharge cycle. The near-perfect overlap of the data lines for both tested samples across all conditions demonstrates a high degree of performance consistency between the individual cells.
Cylindrical Lifepo4 Battery Feature
Superior lifepo4 battery features only 3% self discharge rate per month. Ensure your equipment always ready to go even after several months of storage.Eliminate regular maintenance in water filling and acid check compared to traditional lead-acid batteries.
Lifepo4 battery is inherently safe chemistry against thermal runaway.
The integrated smart BMS can protect against extreme conditions to ensure ultimate safety for different power solutions.
Design without limits. The ultimate building block for custom power solutions. Infinite Series & Parallel combinations to meet your exact spec—no compromises, no wasted space.
Why Choose VTCBATT?
VTCBATT not only focuses on customized design and excellent service to meet the diverse demands of different customers, but also devotes itself to precise and standardized manufacturing in every process to ensure the highest-quality batteries. Meanwhile, VTCBATT will provide comprehensive support from pre-sales to after-sales, focusing on customers’ feedback to establish long-term and win-win cooperation. VTCBATT professional sales and technical engineer teams will be your best custom battery experts to assist with reliable and fast services at any time.
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
The VTCBATT 3.2V 40135 20Ah LiFePO4 battery is widely used in energy storage systems, solar power applications, electric vehicles, AGV robots, and industrial backup power systems, where high safety, long cycle life, and stable power output are essential. With its large-capacity cylindrical design and robust performance, it is ideal for deep cycle applications, off-grid energy storage, and as a reliable replacement for traditional lead-acid batteries, delivering higher efficiency, faster charging, and a significantly longer lifespan.
This battery supports flexible series and parallel configurations, with customized voltage, capacity options, and intelligent BMS integration to precisely match your application requirements. Featuring excellent thermal stability, constant voltage output, deep cycle capability, and superior safety performance, the VTCBATT 3.2V 40135 20Ah LiFePO4 battery ensures efficient energy management, extended service life, and dependable operation for energy storage, mobility, and industrial applications.
