Original Bak N21700cg 5000mAh 2c Rechargeable Li-ion Battery Cell 21700cg 3.6V 21700 Lithium Batteries for Flashlight

• Type: Li-ion Battery
• Cathode Material: NCA
• Rechargeable: Yes
• Shipping Cost: Estimated freight per unit.: about shipping cost and estimated delivery time.
• Currency: US$
• Return&refunds: You can apply for a refund up to 30 days after receipt of the products.
• Size: Small
• Max. Discharge Current: 3c
• Charging Time: 3hours
• Charging Voltage: 4.2V
• Cutoff Voltage: 2.5V
• Transport Package: Box
• Specification: 21700
• Trademark: LONMIL
• Origin: China
• HS Code: 8507600090
• Production Capacity: 1000000PCS/Month
• Package Size: 7.00cm * 3.00cm * 3.00cm
• Package Gross Weight: 0.500kg
• Lead Time: 7 days (1 - 1000 Pieces) ; To be negotiated ( > 1000 Pieces)

Product Description

Product Description

 

21700 Li-ion battery is a new type of lithium-ion battery, which has a size of 21mm diameter and 70mm length. Compared with 18650 lithium battery, 21700 lithium battery has higher energy density and longer service life, which can provide higher power output and more stable performance. 21700 lithium battery is widely used in electric tools, electric vehicles, energy storage systems and other fields, and is one of the future trends of lithium battery market. It should be noted that the use of lithium batteries should follow the correct use and charging methods to avoid over-discharging and over-charging to ensure the safety and stability of the battery.
 

Product Parameters

 

 

Product features	1: higher energy;	Charging Temperature	0~45ºC
	2: 3C discharge rate
Nominal capacity	5000mAh (0.2C)/min	Discharging Temperature	-20 ~ 60ºC
	4900mAh (0.2C)
Nominal voltage	3.6V	Storage temperature	≤1 month: 45~60ºC
			≤3 months: 25~45ºC
			≤12 months: -20~25ºC
			≤60%RH Recharge every 6 months
Max charge voltage	4.2V(cut off charging current 34mA)	Humidity Range	0~60% (non-condensing)
Discharge cut off voltage	2.5V	Dimension	70.75*21.4 (mm) Max
Standard charge current	0.2C	Weight	≤70g
Max charge current	1C (at 25ºC, not for cycle life)	Brand	BAK OEM
Standard dischrge current	0.2C	Warranty	12 Months
Max dischrge current	3C (25ºC, not for cycle life)	PCB/PCM	none
Charging mode	CC/CV	Connector	none
Internal resistance	≤30mΩ (AC Impedance, 1000Hz)	Battery type	Li-ion
Cycle life	500 cycles	Rechargeable or not	Yes

 

Cylindrical lithium-ion rechargeable cell
Model name: 70.75*21.4 (mm) Max

Original imported brand 21700 5000mah Basic parameters
Widely used in electric vehicles, mobile power sources, energy storage, and RVs

Detailed Photos

 

 

Certifications

 

Packaging & Shipping

 

Performance Specification

1. Standard Charge Unless otherwise specified, "Standard Charge" shall consist of charging at constant current of 0.5C. The cell shall then be charged at constant voltage of 4.20V while tapering the charge current. Charging shall be terminated when the charging current has tapered to 50mA. For test purposes, charging shall be performed at 23ºC ± 2ºC.
2. Standard Discharge "Standard Discharge" shall consist of discharging at a constant current of 0.2C to 2.50V. Discharging is to be performed at 23 ºC ± 2 ºC unless otherwise noted (such as capacity versus temperature).
3. High Drain rate Charge/discharge condition Cells shall be charged at constant current of 1,500mA to 4.20V with end current of 100mA. Cells shall be discharged at constant current of 4,000mA to 2.50V. Cells are to rest 10 minutes after charge and 20 minutes after discharge.


Caution Warning

* When using the application equipped with the battery, refer to the user's manual before usage. 
* Please read the specific charger manual before charging.
* Charge time should not be longer than specified in the manual.
* When the cell is not charged after long exposure to the charger, discontinue charging. 
* Battery must be charged at operating temperature range 0 ~ 45ºC. 
* Battery must be discharged at operating temperature range -20 ~ 60ºC.
* Please check the positive(+) and negative(-) direction before packing.
* When a lead plate or wire is connected to the cell for packing, check out insulation not to short-circuit.
* Battery must be stored separately.
* Battery must be stored in a dry area with low temperature for long-term storage. 
* Do not place the battery in direct sunlight or heat.
* Do not use the battery in high static energy environment where the protection device can be damaged.
* When rust or smell is detected on first use, please return the product to the seller immediately.
* The battery must be away from children or pets
* When cell life span shortens after long usage, please exchange to new cells.

* Do not use different charger. Do not use jacks (in cars) for charging. 
* Do not charge with constant current more than maximum charge current.
* Do not disassemble or reconstruct the battery.
* Do not throw or cause impact.
* Do not pierce a hole in the battery with sharp things. (such as nail, knife, pencil, drill)
* Do not use with other batteries or cells. 
* Do not solder on battery directly.
* Do not press the battery with overload in manufacturing process, especially ultrasonic welding.
* Do not use old and new cells together for packing.
* Do not expose the battery to high heat. (such as fire)
* Do not put the battery into a microwave or high pressure container.
* Do not use the battery reversed.
* Do not connect positive(+) and negative(-) with conductive materials (such as metal, wire)
* Do not allow the battery to be immerged in or wetted with water or sea-water