Summary of 16650 2000mAh 3C Cylindrical Li Ion Battery​

The 3.7V 16650 2000mAh 3C Lithium-Ion Battery Cell is a high-performance rechargeable cell engineered for space-constrained, high-reliability applications. With an exceptional energy density of up to 205.56Wh/kg, this cell delivers large capacity in a compact, lightweight form factor, making it ideal for devices that require both power and precision sizing.

Positioned between 18650 and 14650 in diameter, the 16650 cell is specifically designed for special size requirements where standard cylindrical batteries do not fit. It also integrates a built-in pressure relief valve (CID) to enhance safety under abnormal conditions such as short circuits or overcharging. With a wide operating temperature range of -20°C to 65°C, this battery performs reliably even in low-temperature environments.

16650 Rechargeable Battery​ Specification

Model: 16650

Rated capacity: 2000mAh

Energy: 7.4Wh

Energy Density: 205.56Wh/kg

Minimal Capacity: 1950mAh

Rated voltage: 3.7V

Discharge Cut-off Voltage: 2.75V

Charge Cut-off Voltage: 4.2V

Cycle Life: More than 500 cycles

Dimensions: Φ16*65mm

Weight: 36g

Internal Resistance: Less than 60mΩ

Standard Discharge Current: 0.2C (400mA)

Standard Charge Current: 0.2C (400mA)

Max Continuous Discharge Rate: 3C (6A)

Max Continuous Charge Current: 1C (2A)

Charging Temperature: 0 to 45℃;

Discharge Temperature: -20 to 65℃

Storage Temperature:

• -20℃~25℃: 12 months
• -20℃~45℃: 3 months
• -20℃~60 ℃: 1 month

Key Features – 16650 Li Ion Battery​

🚀 Ultra-High Energy Density

With an energy density of up to 205.56Wh/kg, the 16650 lithium-ion cell maximizes runtime while minimizing weight. This allows designers to achieve higher performance without increasing battery size or device bulk.

📦 Large Capacity in a Compact Size

Despite its small footprint, the 2000mAh capacity supports longer operating times. The slim cylindrical profile makes it perfect for portable and embedded systems where space efficiency is critical.

📐 Optimized 16650 Form Factor

The 16650 battery diameter sits between 18650 and 14650, filling a crucial gap for custom or non-standard battery compartments. It offers greater flexibility for engineers designing devices with strict dimensional constraints.

🛡️ Built-In Safety Pressure Relief Valve (CID)

For enhanced safety, the cell includes an internal current interrupt device (CID). In the event of short circuit, overcharge, or abnormal internal pressure, the valve activates to cut off current and release pressure, effectively preventing thermal runaway or more serious failures.

❄️ Wide Operating Temperature Range

Designed for demanding environments, this lithium-ion cell operates reliably from -20°C to 65°C. Its excellent low-temperature performance ensures stable discharge even in cold conditions.

🔁 Rechargeable & High Discharge Capability

With a 3C continuous discharge rate, the cell supports applications requiring stable power output and fast energy delivery, while maintaining long cycle life under proper charging conditions.

❓ Frequently Asked Questions (FAQ)

Q1: What is the difference between 18650 and16650 battery?

Q2: What is the voltage of a 16650 battery?

A 16650 lithium-ion battery has a nominal voltage of 3.7V, which is the standard operating voltage during normal use. When fully charged, its voltage typically reaches 4.2V, while the recommended cut-off voltage is 2.75V.

Q3: Can overcharging a battery damage it?

Q5: How do I keep my battery 100% healthy?

Cylindrical Battery Cell List (Li-ion and LiFePO4)