The 18650 3.7v 2600mAh Lithium-ion Battery is a high-efficiency, rechargeable power source for diverse electronic projects. Delivering a steady 2600mAh capacity, ensuring long-lasting energy for devices like flashlights and DIY robotics. Its compact, cylindrical design fits into standard battery holders for easy integration. With its high energy density and reliable performance, this battery powers portable gadgets and educational experiments safely when used correctly. Pair it with a Battery Management System (BMS) for enhanced safety in custom-built projects.

Key Features

• Provides a steady 3.7v nominal voltage for consistent performance.
• 2600mAh capacity supports extended runtimes in high-drain devices.
• Rechargeable up to 500 cycles, ensuring cost-effective longevity.
• Compact 18mm x 65mm size fits standard 18650 holders.
• Lightweight at approximately 46g, ideal for portable projects.
• High energy density outperforms traditional NiCd or NiMH batteries.

Technical Specifications

• Nominal Voltage: 3.7v (4.2v fully charged, 2.5v discharged).
• Capacity: 2600mAh.
• Dimensions: 18mm diameter, 65mm length.
• Chemistry: Lithium-ion (Li-ion), often unprotected.
• Max Charging/Discharging Current: 1.5C (3.9A).
• Cycle Life: 300-1000 cycles, depending on usage.

Applications

• PowerLED flashlights.
• Power motors in robotics and RC vehicles.
• Charge smartphones via DIY power banks.
• Supplies energy for off-grid solar projects.

Usage

• Connection
  • Insert the battery into a compatible 18650 holder, matching the positive (+) and negative (-) terminals to the holder’s labels. For custom setups, solder wires to the terminals, avoiding overheating. Use a Battery Management System (BMS) to prevent overcharging or short circuits, as most 18650s lack built-in protection. Verify polarity to ensure safe operation.
• Programming
  • Programming is optional but useful for smart projects. Connect the battery to microcontrollers like Arduino or Raspberry Pi via a BMS. Use libraries like Adafruit’s PowerBoost to regulate power. Monitor voltage (2.5v to 4.2v) to maintain safe operation, using simple scripts to track battery status.
• Testing
  • Measure voltage with a multimeter (expect ~3.7v). Insert the battery into a device like a flashlight to confirm functionality. Charge using a dedicated 18650 charger and verify it reaches 4.2v. Test capacity with a battery analyser if the runtime seems short.
• Troubleshooting
  • Device not working: Check polarity and connections; recharge if voltage is below 2.5v.
  • Short runtime: Test capacity; replace if significantly below 2600mAh.
  • Charging issues: Ensure the charger outputs 4.2v; inspect terminals for damage.
• Caution
  • Avoid short-circuiting or puncturing, which can cause fires. Do not charge above 4.2v or discharge below 2.5v. Use a BMS for safety, as unprotected batteries lack internal safeguards. Store in a cool, dry place, away from flammable materials.