2500mah-3c 18650 lithium battery refers to a lithium-ion battery with a diameter of 18mm, 6 length of 65mm, and 0 represents a cylindrical lithium ion battery. 2500mah-3c means that the minimum battery capacity is 2500mah and the maximum continuous discharge current is 3c. The energy density is very high. Generally, 18650 batteries are used more in industry, but few in civilian use. The common ones are laptop batteries and high-end flashlights. Used more.
|Capacity||Typical capacity: 2550mAh (0.2C discharge to 2.75V)
Minimum capacity: 2500mAh (discharge at 0.2C to 2.75V)
|Internal Resistant||19 ± 2mΩ|
|Final Discharging Voltage||2.75V（Discharge current＞5C, cut-off voltage 2.5V）|
|Charge Upper Limit Voltage||4.20 ± 0.05V|
|Standard charge current||0.5C|
|Fast Charge Circuit||1.0C|
|Standard discharge current||1.0C|
|Maximum continuous discharge current||3C|
|Weight Cell Weight||46±1g|
|Operating Temp||Charging: 0℃≤ T≤ 10℃ (0.2C), 10℃＜T≤45℃(0.5C)
Humidity: less than 85%RH
|Storage temperature and humidity||Within one month: -20~60℃
Within 6 months: -20~45℃
Within 12 months: -20~25℃
18650 battery life theory is 1000 cycles of charging. Because of the large capacity per unit density, most of them are used in laptop batteries. In addition, because the 18650 has a very good stability at work, it is widely used in various electronic fields: Toys, Power Tools, Home Appliances, Consumer Electronics, SUBMARINES, Electric Bicycles/Scooters etc.
1. internal resistance
Test method: Use an internal resistance tester to test the internal resistance of the battery under 1kHz AC conditions Standard: 19 ± 2mΩ
2. rate discharge performance
Test method: charge according to the standard method at 25±2℃, discharge to 2.75V at 0.5C, 1.0C, 2.0C, and 3.0C respectively, record the battery discharge
Capacitance Standard: Calculate the percentage of 0.5C discharge capacity of the battery and meet the requirements of the following table.
0.5C 1.0C 2.0C 3.0C
100% ≥98% ≥95% ≥95%
3. Cycle life
Test method: Under the condition of 25±2℃, firstly charge at a constant current at 0.5C to the upper limit voltage of 4.20+/-0.05V, and then charge at a constant voltage to a cut-off current of 0.02C;
After 10min, discharge at 1C to 3.0V, after the end of discharge, leave it for 15min and proceed to the next cycle, until the discharge capacity is the first time for two consecutive times
80% of the capacity, the end of life is considered
Standard: discharge capacity after 500 cycles ≥80% first capacity
4. Low temperature performance
Test method: After the battery cell is fully charged according to 4.5 at a temperature of 25±2℃, put it aside for 24h at -20℃, and then use a constant current of 0.5C
Discharge to 2.75V voltage cut-off
Standard: discharge time ≥84min
5. High temperature performance
Test method: After the battery cell is fully charged according to 4.5 at a temperature of 25±2℃, put it aside for 5h at a temperature of 55℃, and then discharge it at a constant current of 0.5C
Power to 2.75V voltage cut-off
Standard: discharge time ≥108min
Test method: The battery that is less than 3 months from the production date to the test date is charged with a capacity of 40%~50% according to the CC-CV charging method, and then in the ring
Store in an environment with an ambient temperature of 25±2℃ and a relative humidity of 45%-85% for 12 months. After the storage period expires, press 4.2 to fully charge and discharge to 2.75V at 0.5C
Standard: discharge time ≥108min
The battery is in a half-full state when it is packaged, and the manufacturer’s name, product name, model, production batch number, nominal voltage, quantity, Gross weight, date of manufacture and corresponding internal resistance and capacity. Battery pack: 100 batteries per box; 4 boxes per box, 400 batteries in total
High energy density
Green energy and pollution-free
Long cycle life
No memong effect
1. It is forbidden to knock, throw or step on the battery, and do not put the battery in the washing machine or high-pressure container.
2. Do not put the battery near heat sources, such as fire, heater, etc., do not use or store the battery under the scorching sun or the temperature over 60℃, otherwise it may cause the battery to heat up, catch fire and malfunction.
3. Do not get the battery wet or put it in the water. When not in use, please place it in a low temperature and dry environment.
4. When using, testing or storing the battery, if you find that the battery becomes hot, emits odor, discoloration, deformation or other abnormalities, please stop using or testing immediately, and try to isolate the battery and keep it away.