LiFePO4

3.2V 40135 20Ah Lifepo4 Lithium Battery for Energy storage systems, solar battery systems, telecom base station backup, electric tricycles

Parameter	Specification
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

✓Certification supportCB, CE, UL, UN38.3, MSDS, IEC61000, IEC62133, EU2023/1542

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Product overview

3.2V 40135 20Ah Lifepo4 Lithium Battery for Energy storage systems, solar battery systems, telecom base station backup, electric tricycles | Battery Manufacturers in China & Battery Supply Factory

VTCBATT is a professional supplier of 3.2V 40135 20Ah LFP Lithium Battery for Energy storage systems, solar battery systems, telecom base station backup, electric tricycles

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.

Technical insight

Product and application details

trolling motor batteries

The compact ∅40 mm diameter allows these cells to fit into narrow trolling motor mounts while delivering consistent 0.5C discharge.

Energy storage systems

High cycle life supports daily cycling in off-grid setups, where the 3.2V nominal voltage simplifies series string balancing.

floor cleaning machines

Weighing only 415g, this lightweight cell reduces overall machine mass, improving maneuverability in tight indoor spaces during cleaning cycles.

electric scooters

The 135 mm length accommodates vertical mounting tubes in scooter frames, providing stable 20Ah capacity for moderate urban commutes.

low-speed electric vehicles

Robust thermal stability up to 60℃ ensures safe operation during high-load acceleration phases common in low-speed vehicle duty cycles.

electric tricycles

The standardized cylindrical form factor enables easy integration into custom tricycle battery boxes, supporting reliable 0.5C continuous discharge.

camping power supply

Wide -20℃ operating range guarantees functionality in cold outdoor environments, ensuring dependable power for portable camping electronics.

AGV robots

Precise dimensional tolerances (±0.5 mm) facilitate automated stacking in AGV battery packs, maintaining structural integrity during repetitive charging cycles.

Factory capability

VTCBATT Production and Service

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 provides comprehensive support from pre-sales to after-sales, focusing on customer feedback to establish long-term and win-win cooperation. VTCBATT professional sales and technical engineer teams will be your custom battery experts for reliable and responsive project support.

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Modern Manufacturing

From raw materials mixing to cell testing, VTCBATT adopts automated manufacturing processes to improve production efficiency and battery quality, safety, and reliability. The manufacturing process is monitored and tested before material moves to the next procedure.

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Trusted by Global Customers

Over the past 20 years, VTCBATT has built partnerships with customers in more than 50 countries. Reliable quality, responsive service, and tailored battery solutions support long-term cooperation with equipment manufacturers, distributors, and brands.