18650 Lithium-ion 3.7 V Battery

Sunpower New Energy can supply you with good performance and a safe lithium-ion battery 18650 3.7v. With more than 10 years of manufacturing experience and large investment in lithium-ion technology, our wholesale 18650 lithium-ion battery 3.7v is popular in the global market, exported to the US, Europe, and Russia. If you are interested in Sunpower 3.7 v li ion battery 18650 for wholesale or OEM&ODM, please contact us for more details.

The Safety of Sunpower 18650 Li-ion 3.7v Battery

Sunpower New Energy ensures the 3.7 v 18650 li-ion battery is safe and durable to use. Because our battery endures 7 strict safety tests, not cause fire or explosion. Safe 18650 lithium ion 3.7 v battery is the priority.

Test 1: Overcharge

After regular charging, 3.7-volt lithium-ion battery 18650 rests for 10 minutes; then charging 3.7 v li ion 18650 cells with a 1C current until the voltage reaches 6V. Monitoring the cell temperature change until the cell temperature drops to room temperature. 

Test 2: Forced Discharge

Discharge the 18650 lithium-ion battery 3.7v according to standard discharge requirements, then charge it in reverse with a 1C current for no less than 90 minutes. 

Test 3: Short Circuit

After standard charging, place the 18650 lithium-ion 3.7 v battery in 20℃±5℃ and 55℃±5℃ environment respectively. Short-circuit the positive and negative terminals with an 80±20mΩ resistor. Finish the test until the  3.7 v 18650 li-ion battery explodes or catches fire, the battery reaches a fully discharged state (battery voltage below 0.2V), or the surface temperature of the battery decreases to within ±10℃ of the testing temperature.

Test 4: Crush

After standard charging, subject the 3.7 v 18650 li-ion battery to a compressive force of 13 kN±1 kN between two plates.

Test 5: Impact

After standard charging, place the 3.7 v 18650 lithium battery on a platform. Position a steel rod with a diameter of 15.8±0.1 mm horizontally through the center of the battery. Drop a 9.1±0.46 kg weight from a height of 610±25 mm onto the intersection of the steel rod and the battery.

Test 6: Heating (130°C)

After standard charging, place the 18650 lithium-ion 3.7 v battery in a constant temperature chamber with natural or forced air circulation. Increase the temperature at a rate of 5°C±2°C per minute until it reaches 130°C±2°C. Then maintain this temperature for 10 minutes.

Test 7: Free Frop

A fully charged 3.7 lithium-ion battery 18650 is dropped from a height of 1 meter three times.