Strives to create the first brand of
new energy power lithium battery

  • Jiangsu Sunpower Factory
  • Lithium Battery
  • Lithium Ion Battery
  • INR18650 Battery
Home / Products / INR18650 Battery / INR18650-2500mAh battery
  • INR18650-2500mAh  Li-ion Rechargeable cylindrical battery
  • INR18650-2500mAh  Li-ion Rechargeable cylindrical battery
  • INR18650-2500mAh  Li-ion Rechargeable cylindrical battery
  • INR18650-2500mAh  Li-ion Rechargeable cylindrical battery
Product Name:

INR18650-2500mAh Li-ion Rechargeable cylindrical battery

Product Parameter

2500mah Li-Ion Battery Product Details:

2Can MaterialNi-Iron
3Rated Capacity2500 mAh(0.2C )
Min. Capacity2450 mAh(0.2C )
4Nominal Voltage3.7V
5Max. Charge Voltage4.2 V
6Discharge Cut-off Voltage2.75V
7Max. Charge Current2.5 A
8Standard Discharging Current1.3 A
9Max. Continuous Discharge Current20 A
10Max. Pulse Discharge Current30A( 3s pulse )
11Max. Diameter(include PET)≤18.40 mm
12Max. Height (include PET)≤65.50mm
13Weight (Approx.)44.0±1.0g
14Impedance (Max. at 1000Hz、charged status)≤ 18 mΩ
15Charge Method (CC/CV)Standard0.5 C ×6hrs
Quick1 C ×1.5hrs.
16Operating TemperatureCharge0℃~45℃ 32oF~113oF
Discharge-20℃~60℃ -4oF~140oF
Storage-20℃~45℃ -4oF~113oF


INR18650-2500mAh  Li-ion Rechargeable cylindrical battery

Mainly capability  graph (For Reference Only)

INR18650-2500mAh  Li-ion Rechargeable cylindrical battery INR18650-2500mAh  Li-ion Rechargeable cylindrical battery

INR18650-2500mAh  Li-ion Rechargeable cylindrical batteryINR18650-2500mAh  Li-ion Rechargeable cylindrical battery


Without special instructions, the following tests should be done under the condition of : temperature(23℃±3℃), atmospheric pressure (86KPa~106KPa), relative humidity (45%~85%), and the tests should be done within two weeks after receiving the products.

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 .

Electrical Characteristic

NO.ItemStandardTest Method
1Discharge rate capabilitiesA)1 C   ≥97% B)5 C   ≥90% C)10C   ≥85%Standard charged under the condition of normal atmospheric pressure and the environmental temperature of 23℃±3℃ and45%~85%RH, then rest for 30mins and discharge at1C 、5 C 、10 C   to the discharge cut-off voltage respectively. Charge/discharge cycle can be conducted for 3times before meeting the Standards(the same below)
2capacity retention and recoveryResidual capacity≥94%Recoverable capacity≥*98%Standard charged under the condition of normal atmospheric pressure and the environmental temperature of 23℃±3℃,Stored for 28 days, then discharge at 0.2 C   to 2.75V measuring residual capacity; Then standard charge/discharge measure recoverable capacity.

Low Temperature Performancedischarge capacity≥85% rated capacityno distortion and no ruptureThe cell shall be charged in accordance with the standard charge. Then stored in the temperature of -10℃±1℃ for 4h, Discharge at the constant current of 0.2C down to the end-of-discharge voltage 2.750V.
4Cycle Life2.5A charge/10A discharge cycle ≥500cycles;
           2.5A charge / 20A discharge cycle ≥ 250cycles
A: 1C   charged the cell to 4.2V,then change to charge with constant voltage till the current less than or equal to 0.04C , rest for 30mins; 10A/20A discharge to 2.75V, one cycle is finished, rest for 30mins. Then repeat above steps, when capacity is less than 60% of initial capacity, the battery life is over.

Safety  Characteristic

NO.ItemStandardTest Method
1OverchargeNo fire, No explosionAfter standard charge, rest for 10mins; then charge at constant current of 3C   to 10V.(or charge at 3C   for90mins).

Forced dischargeNo fire, No explosionThe battery to be discharged with standard discharging condition, Inverse charge current =1C ;time: ≥90mins
3Short Circuit testNo fireNo explosionThe battery to be fully charged with standard charging condition, and short the positive and negative terminalswith wire resistance ≤50mΩ.Tests are to be conductedat 23℃±3℃  and at 55℃ ±5℃, keep 24h or case temperature decline to 20% of the max temperature ,test isover.
4Crush testNo fire, No explosionA 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.
5Shock testNo fire, No explosionThe full charged battery is fixed on shock table, to force a certain shock to three mutual vertical direction, in initial3ms, the min. average acceleration is 75gn,the peak acceleration is between 125gn and 175gn.
6Heating test (130°C)No fire, No explosionThe 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 to130°C±2°C,and maintain for 10mins. 电池按标准充满电后放于自然或循环空气对流的恒温 箱中,温度以 5℃/min±2℃的速率升至 130℃±2°C 并保持 10mins。---UL1642

Temperature Cycling Testno leakage, no fire, no explosionThe 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 within30 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

NO.ItemStandardTest Method
1Altitude/Low pressure simulation testno leakage, no fire, no explosionThe 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℃.
2Free drop testno fire, no explosionThe fully charged battery drops on the concrete ground from height(1m),total 3 times,to obtain the shock of random directions.

Vibration testNo remarkable damage, No smoking , No explosionAfter 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 minutebetween 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.

INR18650-2500mAh  Li-ion Rechargeable cylindrical battery

Warranty Period & Product Liability  

Warranty period of this product is 12 months from manufacturing code. JIANGSU SUNPOWER CO., LTD. is not responsible for the troubles caused by mishandling of the battery which is against the instructions in this specification.

Warnings and Cautions  in Using the Battery

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.

● When use the battery , must to ensure the charge and discharge voltage of the battery is between 2.75V to 4.2V.

● 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 3.4V-3.6V 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%±20%RH;please activate the battery once every 3 months according to the following method: Charge with current 0.2C  until the voltage achieve to 3.6V.

Related Products

Contact Us
Follow Us