🔋 18650 3S2P Battery Pack — 11.1V 4500mAh Rechargeable Li-ion Pack

Overview

This 18650 3S2P lithium-ion battery pack connects six Grade A 18650 cells — three in series, two in parallel — delivering stable 11.1V / 4500mAh (49.95Wh). The 4500mAh capacity makes it a strong mid-range option between the standard 5200mAh (2600mAh/cell) and budget 4400mAh (2200mAh/cell) configurations — offering excellent runtime, competitive weight, and strong cycle performance. Ideal for laptops, portable power stations, power tools, medical devices, and industrial robots. CE and UN38.3 certified, in stock, full OEM customization available.

3S2P Architecture

┌──────────────────────────────────────────┐
│ String 1: [A1] ── [A2] ── [A3]  = 11.1V │
│                   ║                      │
│ String 2: [B1] ── [B2] ── [B3]  = 11.1V │
│               ↓ Parallel ↓               │
│    Total: 11.1V / 4500mAh = 49.95Wh     │
│           6 cells total                  │
└──────────────────────────────────────────┘

3S = 3.7V × 3   = 11.1V
2P = 2250mAh × 2 = 4500mAh

Key Specifications

Parameter	Specification
Configuration	3S2P
Total Cells	6× Grade A 18650
Cell Capacity	2250mAh / cell
Nominal Voltage	11.1V
Fully Charged	12.6V
Capacity	4500mAh
Energy	49.95Wh
Internal Resistance	≤ 180mΩ (pack)
Weight	≈ 270g
Recommended Charge	0.5C = 2.25A CC/CV
Max Charge Current	4.5A (1C)
Continuous Discharge	9.0A (2C)
Peak Discharge	18.0A (4C)
Discharge Cut-off	9.0V (3.0V/cell)
Self-discharge Rate	≤ 2% / month
Cycle Life	≥ 500 cycles
Capacity Retention	≥ 80% at 500 cycles
Operating Temp	-20°C ~ 60°C
Storage Temp	-10°C ~ 25°C
Storage Voltage	11.4V (3.8V/cell)
Balance Connector	JST-XH 4Pin (3S)
Discharge Connector	XT60 / DC Jack / custom
Wire Gauge	AWG18
Wire Length	150mm
Certification	CE / UN38.3 / RoHS

Full Voltage Reference

State	Voltage	Note
Fully charged	12.6V	4.2V × 3
Nominal	11.1V	Standard rating
Storage	11.4V	3.8V/cell — optimal
Low warning	9.9V	3.3V/cell — recharge
BMS cutoff	9.0V	3.0V/cell — hard stop
Overcharge cutoff	12.75V	4.25V/cell — BMS

3S2P Full Capacity Comparison

SKU	Cell	Voltage	Capacity	Energy	Weight	Grade
3S2P-4400	2200mAh	11.1V	4400mAh	48.84Wh	≈265g	Standard
3S2P-4500 ⭐	2250mAh	11.1V	4500mAh	49.95Wh	≈270g	Mid-grade
3S2P-4800	2400mAh	11.1V	4800mAh	53.28Wh	≈285g	Standard
3S2P-5200	2600mAh	11.1V	5200mAh	57.72Wh	≈305g	Grade A
3S2P-6000	3000mAh	11.1V	6000mAh	66.6Wh	≈330g	High Grade
3S2P-7200	3600mAh	11.1V	7200mAh	79.92Wh	≈375g	Premium

⭐ 4500mAh positioning: Sits between budget 4400mAh and standard 5200mAh — ideal when cost efficiency is prioritized over maximum capacity.

3S2P-4500 vs Nearby SKUs

Metric	3S2P-4400	3S2P-4500	3S2P-5200
Cell capacity	2200mAh	2250mAh	2600mAh
Energy	48.84Wh	49.95Wh	57.72Wh
Weight	≈265g	≈270g	≈305g
Cost index	Budget	Mid	Standard
Cycle life	≥500	≥500	≥500
Best for	Cost-sensitive	Balanced	Performance

Runtime Estimation

Device	Power Draw	Runtime
Laptop (light use)	25W	≈ 1.7 hours
Laptop (full load)	45W	≈ 57 min
Portable power station	80W	≈ 38 min
Cordless power tool	60W	≈ 51 min
Medical handheld	15W	≈ 2.8 hours
Industrial robot arm	40W	≈ 1.5 hours
Handheld terminal	10W	≈ 4.2 hours
UPS backup	20W	≈ 2.1 hours

📌 Based on 49.95Wh at 85% efficiency.

BMS Protection — 6-Cell System

Protection	Threshold	Function
⚡ Overcharge/cell	4.25V cutoff	Prevents thermal runaway
🔋 Over-discharge/cell	2.75V cutoff	Preserves cycle life
⚖️ Cell balancing	Auto on charge	Equalizes all 6 cells
🔥 Overcurrent	>18A trip	Protects tool & robot circuits
⚠️ Short-circuit	Instant cutoff	User & device safety
🌡️ Over-temperature	65°C cutoff	Thermal protection
🔁 Auto-recovery	After fault cleared	Field-friendly

Applications

Industry	Typical Devices
💻 Laptops	10.8V~11.1V laptop replacement packs
🔧 Power Tools	Cordless drills, grinders, sanders
⚡ Portable Power	Mid-size power stations, backup packs
🤖 Robotics	Light robot arms, educational platforms
🏥 Medical	Portable monitors, handheld diagnostics
🏭 Industrial	AGV carts, mobile terminals, field instruments
💡 UPS & Backup	Server UPS, emergency lighting
🛵 E-mobility	Low-power e-scooters, electric wheelchairs

✈️ IATA Air Freight Status

Parameter	Value
Energy	49.95Wh
IATA Category	Section II
Air status	✅ Minimal restrictions
Quantity limit	No limit per package

✈️ At 49.95Wh, this pack qualifies as IATA Section II — the most logistics-friendly category for lithium battery packs. Lowest DG shipping cost and documentation requirements.

Charging Guide

Mode	Current	Time	Notes
0.5C Standard	2.25A	≈ 2h	✅ Best cycle life
1C Normal	4.5A	≈ 65min	✅ Daily use
2C Fast	9.0A	≈ 32min	⚠️ Occasional only
Storage mode	2.25A → 11.4V	—	✅ >3 days storage

⚠️ Use 12.6V / 3S balance charger with JST-XH 4Pin connector only.

Default Package Configuration

Item	Specification
Pack	18650 3S2P 11.1V 4500mAh
Cells	6× Grade A 18650 2250mAh
BMS	✅ 6-cell balancing + full protection
Discharge connector	XT60 / DC Jack (select)
Balance connector	JST-XH 4Pin (3S)
Wire gauge	AWG18
Wire length	150mm
Housing	PVC wrap / ABS case (select)
Label	Standard / OEM white-label
Stock	✅ In stock

OEM / Custom Options

Option	Details
Capacity	4400 / 4500 / 4800 / 5200 / 6000 / 7200mAh
Configuration	3S1P / 3S2P / 3S3P / 3S4P
Connector	XT60 / DC Jack / Anderson / bare wire
Balance lead	JST-XH 4Pin (3S) standard
Wire length & gauge	100~300mm / AWG14~AWG20
BMS	Standard / Smart BMS with fuel gauge
Housing	PVC wrap / ABS hard case / custom
Certification	CE, UN38.3, RoHS, UL1642, IEC62133
Branding	OEM / white-label labeling
MOQ	20 pcs

Certification & Compliance

Certificate	Scope	Status
✅ CE	EU market	Standard
✅ UN38.3	Global freight	Standard
✅ RoHS	Substance compliance	Standard
✅ MSDS	Safety data sheet	Standard
📋 IEC 62133	Battery safety	On request
📋 UL 1642	US market	On request

Why Choose Us?

🏭 Factory Direct — own 18650 pack assembly, zero intermediaries
✈️ Section II air freight — 49.95Wh, lowest DG logistics complexity
⚖️ 6-cell BMS balancing — every pack balanced before shipment
🔋 Grade A cells — 100% capacity verified before assembly
📋 CE + UN38.3 standard — full documentation included
🔬 7-day OEM sample — any capacity, any connector
🛠️ Full OEM service — spec to certified mass production

📩 Need 11.1V pack? Tell us your device current draw and runtime requirement — optimal 3S configuration quoted within 24 hours.

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3S2P 11.1V 4500mAh 18650 Li-ion Battery Pack Rechargeable for Laptop E-scooter Power Tool Industrial Robot UPS Backup | Custom OEM | CE In Stock

🔋 18650 3S2P Battery Pack — 11.1V 4500mAh Rechargeable Li-ion Pack

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