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18650

18650 3C Li-ion Rechargeable Battery: 3.7V 3500mAh

18650 3C Li-ion Rechargeable Battery: 3.7V 3500mAh
18650 3C Li-ion Rechargeable Battery: 3.7V 3500mAh
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18650 3C Li-ion Rechargeable Battery: 3.7V 3500mAh

The 18650 battery is a lithium-ion rechargeable battery originally developed by Sony Corporation in Japan. The name "18650" refers to the battery's dimensions: 18mm in diameter and 65mm in length, with the "0" indicating that it is a cylindrical cell. Due to its excellent performance and versatility, the 18650 battery has become one of the most widely used types in the battery industry today.

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Description


Main Features & Specifications

1. Key Features

FeatureDescription
High Energy DensityStores a large amount of energy in a compact size.
Long LifespanExtended cycle life with proper usage and maintenance.
SafetyEnhanced safety features including overcharge protection, over‑discharge protection, and short‑circuit protection.
Wide ApplicationsCommonly used in flashlights, laptops, electric vehicles, and other electronic devices.

2. Electrical Specifications

ParameterValue
Nominal Voltage3.7V
Maximum Charge Voltage4.2V (fully charged)
Capacity RangeApprox. 1500mAh – 3500mAh (varies by brand and model)
Charging TimeTypically 2 – 3 hours, depending on charger power and battery capacity




Item

Condition / NoteSpecification
2.1 EnergyStd.charge / dischargeNominal 3500 mAh
Minimum 3400 mAh
2.2 Nominal VoltageAverage3.635V
2.3 Standard ChargeConstant current0.5C (1700mA) (Refer to 4.1.1)

Constant voltage4.2V

End current(Cut off)50mA
2.4 Max.Charge Voltage
4.2±0.05V
2.5 Max.Charge Current
1.0C(3400mA)
2.6 Standard DischargeConstant current0.2C (680mA) (Refer to 4.1.2)

End voltage(Cut off)2.5V
2.7 Max.Discharge Current
10A
2.8 WeightApprox.Max.49.0 g
2.9 Operating TemperatureCharge0~45℃

Discharge-20~60℃
2.10 Storage Temperature1 month-20~60℃ (for shipping state)

3 month-20~45℃

1 year-20~20℃


1. Installing the Battery into the Pack

  • Visually inspect each cell before assembly.

  • Do not use damaged cells (e.g., damaged surface, can distortion, electrolyte smell).

  • Do not combine cells from different lot numbers in the same pack.

  • Do not mix different cell types or cells from different manufacturers.

2. Design of Battery Pack

  • The pack must not be easily connectable to any charger other than the dedicated one.

  • The pack must incorporate features to prevent external short circuits.

3. Charge

  • Method: Constant Current – Constant Voltage (CC/CV).

  • Charge only within the maximum voltage and current specified in the product specification (see Articles 2.4, 2.5).

  • Charge only within the operating temperature range specified in the product specification (see Article 2.9).

4. Discharge

  • Method: Constant Current (CC).
    For mobile equipment, constant power mode may be used.

  • Do not exceed the maximum discharge current specified in the product specification.

  • Use the cut‑off voltage specified in the product specification.

  • Discharge only within the operating temperature range specified in the product specification.

5. Protection Circuit

  • A protection circuit must be installed in the battery pack and/or charger.

  • The charger or pack must include voltage sensing to prevent overcharge and over‑discharge, maintain normal operation, and protect against cell imbalance.

  • The charger or pack must include warning systems for over‑temperature, over‑voltage, and over‑current.


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SHENZHEN EASTAR BATTERY CO.,LTD

TEL: 86-18664968482

E-mail: info@eastarco.com sales6@eastarbattery.com

Company add: RM 905,Hongchang Plaza,Shennan Road East, luohu District, Shenzhen

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