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18650 3.7V 2000mAh Rechargeable Li-ion Battery with PCM Protection Connector for Flashlight Headlamp Power Bank Camera IoT Device | In Stock | OEM Factory Direct
$2.50
📦 MOQ: 100 units | OEM & Custom Orders Welcome
🔋 18650 Li-ion Battery — 3.7V 2000mAh Rechargeable Cylindrical Lithium Battery with PCM & Connector
Overview
The 18650 lithium-ion battery is the world’s most widely adopted rechargeable cylindrical cell, delivering a reliable 3.7V / 2000mAh (7.4Wh) in the standard 18 × 65mm form factor. Pre-assembled with a PCM protection board and output connector, this ready-to-integrate unit eliminates the need for external protection circuits — ideal for flashlights, cameras, power tools, power banks, IoT devices, and a broad range of consumer and industrial electronics. CE and UN38.3 certified, with full OEM/ODM customization available for connector type, wire length, PCM rating, and labeling.
Key Specifications
| Parameter | Specification |
|---|---|
| Cell Type | 18650 Cylindrical Li-ion |
| Configuration | 1S1P |
| Nominal Voltage | 3.7V |
| Capacity | 2000mAh |
| Energy | 7.4Wh |
| Cell Dimensions | Ø18 × 65 mm |
| Weight (with PCM) | ≈ 50g |
| Charge Voltage | 4.2V |
| Recommended Charge | 0.5C = 1A CC/CV |
| Max Charge Current | 2A (1C) |
| Continuous Discharge | 2A (1C) |
| Peak Discharge | 4A (2C) |
| Discharge Cut-off | 2.75V |
| Self-discharge Rate | ≤ 2% / month |
| Cycle Life | ≥ 500 cycles |
| Capacity Retention | ≥ 80% after 500 cycles |
| Operating Temp | -20°C ~ 60°C |
| Storage Temp | -10°C ~ 45°C |
| Default Connector | JST-PH 2Pin (customizable) |
| Wire Leads | 100mm AWG24 |
| Certification | CE / UN38.3 / RoHS |
18650 vs LiPo — Which to Choose?
| Feature | 18650 Li-ion | LiPo Soft Pack |
|---|---|---|
| Form factor | ✅ Cylindrical — standard tube housing | Flat — slim enclosures |
| Energy density | Standard | Higher by ~10~20% |
| Drop-in compatibility | ✅ Universal 18mm diameter | Custom per device |
| Cost | ✅ Lower — mass produced | Higher |
| Replacement | ✅ Easy — standard size | Device-specific |
| Cycle life | ≥500 cycles | ≥500 cycles |
| Best for | Flashlights, tools, power banks | Wearables, tablets, IoT |
📌 Choose 18650 when: your device uses a standard cylindrical battery slot, you need easy user replacement, or you’re building a multi-cell pack from standard cells.
18650 Capacity Comparison
| Capacity | Energy | Typical Grade | Best For |
|---|---|---|---|
| 1500mAh | 5.55Wh | Entry / OEM | Budget flashlights, remotes |
| 2000mAh ⭐ | 7.4Wh | Standard OEM | Cameras, tools, IoT |
| 2500mAh | 9.25Wh | Mid-grade | Power banks, headlamps |
| 3000mAh | 11.1Wh | High-grade | Premium power banks |
| 3500mAh | 12.95Wh | Premium | High-capacity power stations |
⭐ 2000mAh is the most cost-effective balance of capacity, cycle life, and price for OEM applications.
Features
- ✅ Industry-standard 18650 format — fits any standard 18mm cylindrical battery holder
- ✅ PCM protection included — overcharge, over-discharge, overcurrent & short-circuit
- ✅ Ready-to-integrate — connector & wire pre-assembled, no external BMS needed
- ✅ Low self-discharge ≤2%/month — retains charge during storage & standby
- ✅ Stable flat discharge curve — consistent 3.7V output across full capacity range
- ✅ ≥500 cycle life / ≥80% retention — long service life for cost-conscious OEM builds
- ✅ Wide operating temp -20°C ~ 60°C — reliable in outdoor flashlight & field tool use
- ✅ CE & UN38.3 certified — EU market ready, global freight compliant
- ✅ In stock — standard models dispatched within 3 business days
- ✅ Full OEM/ODM support — capacity, connector, PCM rating, label & packaging
Applications
| Industry | Typical Devices |
|---|---|
| 🔦 Lighting | Flashlights, headlamps, bicycle lights, emergency lanterns |
| 📷 Imaging | Digital cameras, action cameras, camcorders, trail cameras |
| 🔧 Power Tools | Cordless drills, electric screwdrivers, handheld vacuums |
| 🔋 Power Banks | DIY power banks, portable chargers, solar storage units |
| 🏠 Smart Home | Smart door locks, wireless sensors, alarm systems |
| 🏥 Medical | Portable diagnostic devices, handheld monitors |
| 🏭 Industrial | Barcode scanners, handheld terminals, field instruments |
| 🎮 Consumer | RC toys, walkie-talkies, portable radios, e-cigarettes |
PCM Protection Details
| Protection | Threshold | Function |
|---|---|---|
| ⚡ Overcharge | Cutoff at 4.25V | Prevents cell venting & thermal runaway |
| 🔋 Over-discharge | Cutoff at 2.75V | Preserves cycle life & capacity |
| 🔥 Overcurrent | Trips at >4A | Protects device circuitry |
| ⚠️ Short-circuit | Instant cutoff | Protects user & device safety |
| 🌡️ Thermal range | -20°C ~ 60°C | Reliable in outdoor & industrial use |
🛡️ PCM mounted directly on cell top with insulating wrap — compact, safe, and ready for direct installation into battery holders or housings.
Multi-Cell Pack Options
| Configuration | Voltage | Capacity | Energy | Typical Use |
|---|---|---|---|---|
| 1S1P (this model) | 3.7V | 2000mAh | 7.4Wh | Flashlights, cameras |
| 2S1P | 7.4V | 2000mAh | 14.8Wh | Power tools, RC devices |
| 3S1P | 11.1V | 2000mAh | 22.2Wh | Laptops, e-bikes |
| 1S2P | 3.7V | 4000mAh | 14.8Wh | High-capacity power banks |
| 2S2P | 7.4V | 4000mAh | 29.6Wh | Industrial tools, robots |
| 3S3P | 11.1V | 6000mAh | 66.6Wh | Portable power stations |
📌 All multi-cell configurations available with smart BMS, balance connector, and custom housing.
Connector & Wire Options
| Item | Default | Custom Options |
|---|---|---|
| Connector type | JST-PH 2Pin | JST-SH / ZH / XH / Molex / bare wire |
| Wire length | 100mm | 50mm ~ 300mm |
| Wire gauge | AWG24 | AWG18 ~ AWG26 |
| PCM rating | 2A | 3A / 5A / 8A / 10A options |
| Insulation wrap | PVC heat shrink | Custom color |
Default Package Configuration
| Item | Specification |
|---|---|
| Cell | 18650 3.7V 2000mAh |
| PCM protection | ✅ Included, top-mounted |
| Wire leads | 100mm AWG24 |
| Connector | JST-PH 2Pin |
| Insulation | PVC heat shrink wrap |
| Label | Standard / OEM white-label available |
| Stock status | ✅ In stock — ships within 3 business days |
OEM / Custom Options
| Option | Details |
|---|---|
| Capacity | 1500 / 2000 / 2500 / 3000 / 3500mAh |
| PCM current rating | 2A / 3A / 5A / 8A / 10A |
| Multi-cell config | 2S / 3S / 2P / 3P / custom nSnP |
| Connector | JST / Molex / XT30 / bare wire |
| Wire length & gauge | 50mm ~ 300mm / AWG18 ~ AWG26 |
| Housing | Bare cell / PVC wrap / ABS hard case |
| Label & branding | OEM / white-label / custom print |
| Certification | CE, UN38.3, RoHS, UL1642, IEC62133 on request |
| MOQ | 100 pcs |
Certification & Compliance
| Certificate | Scope | Status |
|---|---|---|
| ✅ CE | EU market compliance | Standard |
| ✅ UN38.3 | Global air & sea freight | Standard |
| ✅ RoHS | Hazardous substance compliance | Standard |
| ✅ MSDS | Material safety data sheet | Standard |
| 📋 UL 1642 | US cylindrical cell standard | On request |
| 📋 IEC 62133 | Portable battery safety | On request |
| 📋 KC | Korea market | On request |
| 📋 BIS | India market | On request |
✈️ At 7.4Wh, single-cell 18650 is IATA Section II with minimal shipping restrictions — lowest DG logistics cost and complexity.
Why Choose Us?
- 🏭 Factory Direct — own 18650 assembly lines, zero intermediaries
- 🔋 True-rated 2000mAh — every cell capacity-tested before PCM assembly
- 🔌 PCM pre-assembled — ready to drop into your housing, no extra sourcing
- 📐 Standard 18mm diameter — fits any off-the-shelf battery holder worldwide
- 📦 Multi-cell pack expertise — scale from 1S1P to custom nSnP from same factory
- 📋 CE + UN38.3 standard — full documentation for customs & procurement
- ✈️ Air-freight friendly — 7.4Wh per cell, IATA Section II lowest restriction
- 🔬 7-day OEM sample — rapid custom PCM rating, connector & multi-cell pack
📩 Tell us your device’s battery slot diameter, current draw & connector type — we’ll configure the perfect 18650 solution within 24 hours.
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James T. –
“Ordered 500pcs for our handheld device project. Capacity matches spec at 2000mAh, PCM protection works reliably. No swelling after 3 months of cycling. Will reorder.”
⭐⭐⭐⭐⭐ — James T., Product Engineer