21700 Battery Lithium-ion Flat Top Cell Flashlight Battery [1-Pack]

21700 Battery Rechargeable with PCB and 5000mAh of Power

High capacity 21700 lithium-ion battery designed for flashlights and high drain devices delivering 5000mAh of reliable power. The EcoGear FX 21700 rechargeable battery are packed with an abundant amount of powerful energy. As our best 21700 battery, it provides up to 500 times of recharging cycles. The choice battery for 21700 LED flashlights and battery-powered professional equipment. When you think of high powered cell batteries, these 21700 lithium batteries deliver the power needed. The 21700 battery is commonly used in LED flashlights, electric bikes, vapes, work lights and various other modern devices.

Features and Benefits:

• Integrated PCB Protection
•  Lithium Ion 21700 cylindrical rechargeable battery
• Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V
•  Higher energy density and lower weight than many other rechargeable 21700 battery

Battery Specifications:

• Capacity: Nominal: 5000mAh, Minimum: 4900mAh
• Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V
• Nominal Voltage: Average 3.7V • Cut-off Voltage: 2.5V
• Cycle Performance: 90% of initial capacity at 400 cycles
• Cycle life: > 500 cycles
• Charge: Current = 0.5C (~1500mA) Voltage = 4.2 V End Current = 0.01 mA
• Discharge: Current = 0.5C (~1500mA) End Voltage = 3.0V

Product Dimensions:

• Diameter: 21 mm
• Length: 74 mm These are the same lithium-ion batteries which were once top-selling on Amazon. Unfortunately, Amazon no longer allows the sale of many types of lithium-ion batteries including 21700 batteries.