3.7V 18650 3500mAh Lithium Ion Li-ion Battery with PCB
Summary of 18650 Battery 3500mAh
The 3.7V 18650 3500mAh Lithium Ion Battery with PCB is a high-capacity, lightweight NMC-based power solution designed for portable electronics, LED lighting, medical instruments, and smart devices.
Built with Nickel-Cobalt-Manganese (NMC) chemistry, it offers exceptional energy density, low weight, and superior cycle life. Equipped with a built-in protection circuit board (PCB), the battery ensures safe operation with overcharge, over-discharge, overcurrent, and short-circuit protection.
It supports 2A continuous charge and discharge, performs reliably from -20°C to +65°C, and is fully customizable in terms of size, connectors, BMS, labeling, and packaging — ideal for long-endurance and safety-critical applications.
18650 3500mAh Battery Specification
Model: Lithium Ion Battery 18650
Rated Capacity: 3500mAh
Minimum Capacity: 3450mAh
Rated voltage: 3.7V
Discharge Cut-off Voltage: 2.75V
Charge Cut-off Voltage: 4.2V
Cycle Life: More than 500 cycles
Dimensions: Φ18*65mm
Weight: 51g
Internal Resistance: Less than 50mΩ
Standard Discharge Current: 0.2C (700mA)
Standard Charge Current: 0.2C (700mA)
Max Continuous Discharge Rate: 2A
Max Continuous Charge Current: 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 & Advantages
🔋 High Energy Density & Lightweight NMC Chemistry
Using Nickel-Cobalt-Manganese (NMC) cells, this 18650 battery achieves exceptionally high energy density, providing more power per gram compared to traditional LiFePO4 cells. Lighter design means more compact devices, longer runtime, and improved energy efficiency — perfect for portable and wearable electronics.
💪 High Capacity — 3500mAh for Extended Runtime
With a 3500mAh nominal capacity, this Li-ion cell is ideal for long-endurance applications such as handheld medical instruments, LED flashlights, and industrial sensors. Delivers consistent voltage and stable power output, ensuring dependable performance during prolonged operation.
🧠 Built-in PCB Protection for Enhanced Safety
The integrated Protection Circuit Board (PCB) safeguards the battery against:
🔸 Overcharge and Over-discharge
🔸 Short Circuit and Overcurrent
🔸 Temperature fluctuations
This ensures safe and stable operation, extending both battery life and device protection — ideal for sensitive electronics.
🔁 Long Cycle Life & Reliable Performance
The 3.7V 3500mAh battery retains over 80% of its original capacity after 500 charge/discharge cycles, making it durable and cost-effective. Low self-discharge also means minimal capacity loss during storage — a must for backup or infrequently used devices.
⚡ Supports 2A Continuous Charge & Discharge
Optimized for high efficiency and stable output, this cell can safely handle 2A continuous current. Perfect for devices that require moderate power draw with consistent voltage regulation.
🌡️ Wide Operating Temperature Range (-20°C to +65°C)
The battery performs reliably under both cold and hot environments. From freezing -20°C to scorching +65°C, it ensures stable energy output, suitable for both indoor and outdoor electronic applications.
🧩 Customizable Options (OEM/ODM Support)
We provide comprehensive customization to suit your design and application requirements.
Available customization options include:
Battery dimensions & capacity
PCB & BMS upgrade (smart or higher-current models)
Connectors, cables, and terminals
Label design, shrink sleeves, and outer packaging
Branding: logo printing and OEM/ODM service
💡 Applications
The 3.7V 18650 3500mAh Li-ion Battery with PCB is ideal for:
💡 LED lighting and flashlights
🩺 Medical and diagnostic equipment
📷 Cameras and handheld inspection tools
📡 Wireless communication devices
🧰 Portable testing instruments
🧭 GPS trackers and smart electronics
🔋 Energy backup and small-scale power systems
⚖️ Comparison: PCB Placement Options for 3.7V 18650 Battery
| PCB Position | Typical Dimensions (mm) | Weight | Plug Option | Recommended Applications | |
|---|---|---|---|---|---|
| PCB on positive terminal | Ø18.5 × 70mm | ~51g | JST, Molex etc | Portable sensors, small electronics | |
| PCB on negative terminal | Ø18.5 × 69mm | ~47g | Button Top | LED flashlights, medical devices | |
| PCB mounted on battery side | Ø19 × 71mm | ~50g | JST, Molex etc | Compact devices, embedded systems |
❓Frequently Asked Questions (FAQ)
Q1: What makes the 18650 3500mAh good choice?
A: It offers higher energy density and lighter weight, providing longer runtime in the same form factor.
Q2: Is the PCB necessary for all applications?
A: Yes, for safety-critical or rechargeable devices, the PCB protects against overcharge, over-discharge, and short-circuit damage.
Q3: What charging voltage and current are recommended for this 3.7V 18650 battery?
A: The recommended charging voltage is 4.2V ±0.05V, and the standard charging current is 0.5C (≈1.75A). For longer cycle life, it’s best to use smart chargers with CC/CV charging mode.
Q4: How long does it last under normal use?
A: Typically over 500 cycles, maintaining 80%+ capacity, depending on current load and environment.
Q5: Can this battery be customized?
A: Absolutely. We support OEM customization — including capacity, PCB type, connectors, labels, and packaging.
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