18650 lithium battery

This 18650 lithium-ion cell features a flat top design and delivers 2000mAh capacity at a nominal 3.7V, offering reliable and long-lasting power for a wide range of applications. Whether you’re building custom battery packs, powering high-drain devices, or replacing worn-out cells, this flat top 18650 is an excellent choice for DIY electronics, flashlights, and professional projects requiring compact, unprotected cells.

✅ Specifications:

• Model: 18650

• Terminal Type: Flat Top (Unprotected)

• Chemistry: Lithium-Ion (Li-ion)

• Nominal Voltage: 3.6V – 3.7V

• Nominal Capacity: 2000mAh

• Energy: ~7.4Wh

• Dimensions: ~18.5mm (Diameter) x ~65.2mm (Height)

• Weight: ~43g – 45g

• Internal Resistance: ≤ 20mΩ – 60mΩ (varies by manufacturer)

• Max Continuous Discharge Current: 5A – 10A (typical for 2000mAh cells)

• Cycle Life: >500 cycles (at 0.5C charge/discharge)

• Operating Temperature:

  • Charge: 0°C to +45°C

  • Discharge: -20°C to +60°C

📦 Features:
✔️ Flat top design ideal for spot-welded battery pack assembly
✔️ High energy density for extended runtime
✔️ No memory effect
✔️ Low self-discharge rate (<3% per month)
✔️ Built-in CID and vent for safety (varies by cell)
✔️ Suitable for moderate to high-drain applications

📦 Applications:
✔️ DIY custom battery packs (requires spot welding)
✔️ High-performance flashlights (compatible with flat top holders)
✔️ Power tools and cordless devices
✔️ Electric vehicles (e-bikes, scooters) in multi-cell configurations
✔️ Solar energy storage systems
✔️ IoT projects and robotics power supplies
✔️ Arduino and microcontroller projects (with appropriate holder)
✔️ Replacement cells for battery-powered equipment

⚠️ Important Safety Notes:

• Flat top cells are unprotected. A Protection Circuit Module (PCM) or Battery Management System (BMS) is required when building battery packs.

• Never overcharge or over-discharge. Use a dedicated lithium-ion charger (CC/CV) with 4.2V cutoff. Do not discharge below 2.5V.

• Spot welding recommended. Soldering directly onto flat top cells can damage internal components. Use spot welding for pack assembly.

• Storage: Store at partial charge (3.6V–3.8V) in cool, dry conditions.

• Do not disassemble, puncture, or expose to high temperatures.