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*Currently unavailable.* *We don't know when or if this item will be back in stock.*

Note: This Button Top Version is most suitable for Flashlights that uses Cylindrical 18650 Li-Ion Cells.

Features and Benefits

• Unique and New! With PCB protection!
• Li-Ion 18650 cylindrical rechargeable batteries with Internal Voltage protection PCB!
• Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V.
• Unique PCB design and patent pending.
• 3.7V 2600mAh high capacity
• Higher energy density and lower weight than other rechargeable batteries
• Manufactured under ISO9001-2000 to assure quality
• Battery tested based on International Electrotechnical Commission (IEC) standard to ensure capacity, quality and life time   
  
  

Applications

• Lighting or other device that needs 3.7V power
• Building portable power device needing high energy density and low weight

Warning

• CAUTION: when working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled.
• User should have enough knowledge on Li-Ion rechargeable batteries in charging, discharging, and assembly before use.
• Put the batteries in fire-proof container
• Do not put batteries on wood surface or carpet when charging
• Never leave battery un-attended when charging
• We are not responsible for damage of any modification of the batteries in form, shape or made into packs
• We are not responsible for any damage caused by misuse or mishandling of these Li-Ion batteries

Product Specifications

• Capacity* Nominal  2600 mAh, Minimum 2500 mAh
• Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.35V.  UNIQUE INTERNAL PCB!
• Dimensions:
    Diameter: 19 mm
    Height: 69.5 mm
• Weight (Typical) Approx. 50 g
• Nominal Voltage: Average 3.7V
• Discharge Voltage: 3.0V
• Internal Impedance: less or equal to 130  milliohm (with PTC)
• Cycle Performance: 90% of initial capacity at 400 cycles
• Cycle life: > 500 cycles
• Standard Charge Current: 0.2C (Cut-off Current: 0.01C)
• Fast Charge Current: 0.5C (Cut-off Current: 0.01C)
• Standard Discharge Current: 0.5C (End Voltage = 2.75V)
• Max. Discharge Current: 1.5C

Internal PCB Specifications:

Item	Content	Criteria
Over Charge Protection	Over Charge Detection Voltage	4.325±0.05V
	Over Charge Release Voltage	4.125±0.10V
Over Discharge Protection	Over Discharge Detection Voltage	2.5±0.10V
	Over Discharge Release Voltage	2.9±0.10V
	Rated Operational Current	3.5A
Over Current Protection	Over Current Detection Current	6-8A
	Release Condition	Cut load
	Detection Delay Time	8.0～16.0ms
Short Circuit Protection	Detection Condition	Exterior Short Circuit
	Release Condition	Cut Short Circuit
Interior Resistance	Main Loop Electrify Resistance	VC=4.2V; RDS≤40mΩ
Current Consumption	Current Consumption in Normal Operation	4.0μA Type 8.0μA Max
Dimension (LxWxH)	R8.65 x 0.5 mm

*Note: do not use Button Top version with Tenergy Multifunctional Charger.