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14500 3.7V 500mAh Lithium-Ion Rechargeable Battery (AA Size) for DIY Electronics and Flashlights

14500 3.7V 500mAh Lithium-Ion Rechargeable Battery (AA Size) for DIY Electronics and Flashlights

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ComponentSpecification
ChemistryLithium-Ion (Li-ion)
Model14500 (AA Size Factor)
Nominal Voltage3.7V
Full Charge Voltage4.2V
Capacity500mAh
Cycle Life300–500 Recharges
Terminal TypeButton Top
Price
₹ 42.37 ₹ 42.37
(Tax included)

Product Description The 14500 Lithium-Ion battery is a high-performance cell that shares the same physical dimensions as a standard AA battery but operates at a significantly higher voltage of 3.7V (4.2V when fully charged). With a 500mAh capacity, this cell is engineered for high-drain applications such as powerful LED flashlights, compact robotic actuators, and wireless communication modules. Its lithium chemistry provides a superior power-to-weight ratio compared to Ni-MH batteries, making it the preferred choice for hobbyists looking to minimize the footprint of their portable projects.

Key Features

  • Standard AA Dimensions: Fits into most AA-sized battery holders (note voltage compatibility).

  • High Energy Density: Delivers nearly three times the voltage of a standard 1.2V/1.5V AA battery.

  • Stable 3.7V Rail: Maintains a consistent discharge curve, perfect for 3.3V microcontrollers and sensors.

  • Rechargeable Efficiency: Capable of hundreds of charge cycles with minimal capacity loss.

  • Lightweight Design: Ideal for weight-sensitive applications like small drones or wearable tech.

Technical Details

  • Dimensions: 50 mm (Height) x 14 mm (Diameter)

  • Standard Charge Current: 250mA (0.5C)

  • Max Discharge Current: 500mA to 1000mA (1C–2C)

  • Operating Temperature: -10°C to +60°C

  • Self-Discharge Rate: < 1% per month

  • Weight: Approx. 18g to 20g

Prototyping and Engineering Tips from Robogears

  • Critical Warning: Never use this 14500 battery in place of a standard 1.5V AA battery in household appliances (like TV remotes or wall clocks). The 3.7V output will likely burn out the electronics designed for 1.5V.

  • Arduino Powering: A single 14500 cell is perfect for powering 3.3V logic boards (like the ESP32 or Raspberry Pi Pico) via a 3.3V LDO regulator. For a 5V Arduino, use two 14500 cells in series to get 7.4V, which can be fed into the "VIN" pin.

  • Charging Guidance: Use only a dedicated Li-ion charger set to 4.2V. Charging these with a Ni-MH (1.2V) charger will not work, and using an unregulated DC adapter is extremely dangerous.

  • Protection Circuitry: Since these are often "unprotected" cells, ensure your circuit has a Low Voltage Cutoff (LVC). If the voltage drops below 2.7V, the cell may become permanently damaged and unable to recharge.

Package Includes

  • 1 x 14500 3.7V 500mAh Li-ion Rechargeable Battery

Disclaimer Images are for reference; actual brand marking or wrapper color may vary by batch. Specifications subject to change by manufacturer. Do not short-circuit, incinerate, or disassemble.