Jiangsu Sunpower Co., Ltd.

China Manufacturer with main products: Rechargeable Battery, 18650 Cylindrical Power Lithium-Ion Batteries, Lithium Ion Battery, 18650 Battery

Home  >Products Catalog > INR18650-2500mAh Li-Ion Rechargeable Cylindrical Battery, High Security Lithium Ion Battery

INR18650-2500mAh Li-Ion Rechargeable Cylindrical Battery, High Security Lithium Ion Battery

FOB Price: 1.00 - 11111111111111100.00 USD/Piece
Supply Ability: 12,000,000 Piece(s) per Month
Payment Terms: L/C, T/T
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Export Markets: North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, Mid East, Eastern Asia, Western Europe
Place of Origin: Jiangsu in China
Packaging Details: CARTON BOX

Quick Details

  • Brand Name: Sunpower
  • certificate: ISO/TS16949;ISO14001 ;ISO9001 ;OHSAS18001 ;UL ;CE ;CB ;SGS
  • Certification: 1
  • Automatic Power Saver: 1
  • Battery Bank Voltage: 1


,High security lithium ion battery,,High temperature resistance lithium ion battery


 Product Details:








Can Material



Rated Capacity

2500 mAh(0.2C)

Min. Capacity

2450 mAh(0.2C)


Nominal Voltage



Max. Charge Voltage

4.2 V


Discharge Cut-off Voltage



Max. Charge Current

2.5 A


Standard Discharging Current

1.3 A


Max. Continuous Discharge Current

20 A


Max. Pulse Discharge Current

30A(3s pulse)


Max. Diameter(Include PET)

≤18.40 mm


Max. Height (include PET)



Weight (Approx.)



Impedance(Max. at 1000Hz,Charged status)

≤ 18 mΩ


Charge Method (CC/CV)


0.5 C 6hrs


1 C 1.5hrs.


Operating Temperature


0℃45℃ 32oF113oF


-20℃60℃ -4oF140oF


-20℃45℃ -4oF113oF


Characteristic  for  18650  


without special instructions, the following tests should be done under the condition of: temperature(23℃±3℃), atmospheric pressure (86KPa106KPa), relative humidity (45%85%), and the tests should be done within two

Weeks after receiving the products.

 INR186502500mAh Liion Rechargeable cylindrical batteryHigh security lithium ion battery

the definitions of some nomenclatures of this specification 


Standard Charge: Charge with current 0.2C   to limit charge voltage under the condition of23℃±3℃ surrounding temperature,then change to charge with constant voltage till the current less than or equal to 0.02C.


Safety Characteristic  of




Test Method



No fire,No explosion

after standard charge, rest for 10mins; then charge at constant current of 3C5A to 10V.(or charge at 3C5A for 90mins). 


Forced discharge

No fire,No explosion

the battery to be discharged with standard discharging condition, Inverse charge current =1C5A;Time: ≥  90mins 


Short Circuit test

No fire,No explosion

the battery to be fully charged with standard charging condition, and short the positive and negative terminals 
       with wire resistance  ≤50mΩ.Tests are to be conducted at 23℃±3℃  and at 55℃ ±5℃, keep 24h or case temperature decline to 20% of the max temperature,test is over. 


Crush test

No fire,No explosion

A battery is crushed between two flat surfaces. the applied force is 13 kN±1kN by hydrocylinder, Once the maximum pressure has been obtained or voltage decrease to 1/3 of nominal voltage sharply, then release pressure. 


Shock test

No fire,No explosion

the full charged battery is fixed on shock table, to force a certain shock to three mutual vertical direction, in initial 3ms, the min. Average acceleration is 75gn,the peak acceleration is between 125gn and 175gn.


Heating test 

No fire,No explosion

the cells are fully charged with standard charging condition, and put into incubator with nature air or cycled air convected, heat battery by velocity of 5°C ±2°C/min to 130°C±2°C,and maintain for 10mins. 


 Cycling Test

No leakage, no fire, no explosion

the fully charged batteries are placed in a test chamber and subjected to the following cycles: a) Raising the temperature to 75°C ±2°C within 30 minutes and maintaining this temperature for 6 hours. B) Reducing the temperature to minus 40°C ±2°C within 30 minutes and maintaining this temperature for 6 hours. C) Repeating the sequence for a further 9 cycles. D) after the 10th cycle, storing the batteries for 24 hours prior to examination.


Environment Adaptation Performance  of  





Test Method


Altitude/Low pressure simulation test

No leakage, no fire, no explosion

the full charged cells are to be stored for 6h at an vaccum environment with pressure of less than 11.6kPa and atemperature of 23℃±3℃.


Free drop test

No fire, no explosion

the fully charged battery drops on the concrete ground from height(1m),total 3 times,to obtain the shock of random directions.


Vibration test

No remarkable damage,No smoking  ,No explosion

after standard charging, fixed the cell to vibration table and subjected to vibration cycling that the frequency is to be varied at the rate of 1Hz per minute between 10Hz and 55Hz,the excursion of the vibration is 1.52mm. the cell shall be vibrated for 90 minutes per axis of x, y axes.


Storage Temperature for Shipping

If the cell is kept as ex-factory status (50% of charge), the 0.2C recoverable capacity rate is more than 80%.

1 month-20°C ~ 60 °C

2 months-20°C ~ 40 °C

3 months   -20℃~ 25 °C



There shall be no such defect as deep scratch, flaw, crack, rust, leakage, which may adversely affect commercial value of the cell.




the cells are packed with JIANGSU SUNPOWER CO.,LTD. Standard carton box, which hold four inner boxes. There are 100pcs 18650 cells per inner box. And the inner box and outer box identifies battery capacity, voltage and impedance information.


Warnings and Cautions in Using the   


to prevent a possibility of the battery from leaking, heating or explosion please observe the following precautions:

When using a new battery for the first time or after long term storage, please use the battery charger specifically for that purpose fully charge the battery before use. 

Do not disassemble or open, crush, bend or deform, puncture, or shred;

Do not modify or remanufacture, attempt to insert foreign objects into the battery, immerse or expose to water or other liquids such as water, seawater, drinks such as soft drinks, juices, coffee or others, or expose to fire, explosion, or other hazard.

Do not short circuit a battery or allow metallic or conductive objects to contact the battery terminals. 

Avoid dropping the phone or battery. If the phone or battery is dropped, especially on a hard surface, and the user suspects damage, take it to a service center for inspection.

the battery replacement shall be done only by either cells supplier or device supplier and never be done by the user. 

Replace the battery only with another battery that has been qualified with the system per standard. Use of an unqualified battery may present a risk of fire, explosion, leakage, or other hazard. 

Don't keep a battery at rest for a long time (over 6 months). Safety accident may happen when recharging battery which has a rest for a long time.

in the event of a battery leak, do not allow the liquid to come in contact with the skin or eyes. If contact has been made, wash the affected area with large amounts of water and seek medical advice. 

Battery usage by children should be supervised. Seek medical advice immediately if a battery has been swallowed

Never disassemble cells. the disassembling may generate internal short circuit in the cell, which may cause firing or other problems. 

Never incinerate nor dispose the cells in fire. these may cause firing of the cells, which is very dangerous and is prohibited.

Do not remove the outer sleeve from a battery pack nor cut into its housing. 

Do not mix our batteries with other battery brands or batteries of a different chemistry such as alkaline and zinc carbon. 

Do not mix new batteries in use with semi-used batteries, over-discharge may occur. 

Promptly dispose of used batteries in accordance with local regulations.




the cells might be damaged during shipping by shock. If any abnormal features of the cells are found such as deformation of the cell package, smelling of an electrolyte, an electrolyte leakage and others, the cells shall never be used any more. The Cells with a smell of the electrolyte or a leakage shall be placed away from fire to avoid firing.



the cell shall be stored at the environmental condition of -20℃ - 45℃ and 65%±20% RH. the voltage for long time storage shall be 3.6V-3.9V range. If the cell has to be storied for a long time (over 3 months), the environmental condition should be: Temperature: 23℃±3℃ Humidity: 65%±20RH;Please activate the battery once every 3 months according to the following method: Charge with current 0.2C5A until the voltage achieve to 4.0V.


the company founded in 2014, focus on producing. the company supply, which include 1500mAh, 1300mAh, 2000mAh, 2200mAh, 2500mAh, 2600mAh Li-ion battery and 3000mAh Li-ion battery. All adopt the most advanced extrusion coating production technology and yearly production reaches to 250 million Ah power type. Our products have high quality and competitive prices.

If you want to learn more about the, please visit.



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