18650 Battery Pack 7.4V 5200mAh 2S2P Rechargeable Li-ion Pack for Power Tool Robot Vacuum Medical Device Portable Equipment | CE UN38.3 | OEM Factory Direct

🔋 18650 Battery Pack 7.4V 5200mAh 2S2P — Rechargeable Li-ion Pack

Overview

This 7.4V 2S2P lithium-ion battery pack uses four Grade A 18650 cells — two in series, two in parallel — to deliver stable 7.4V / 5200mAh (38.48Wh). The 5200mAh capacity (based on 2600mAh/cell) offers a slight runtime advantage over standard 5000mAh packs while maintaining the same compact 2S2P form factor. Integrated BMS with 4-cell balancing, overcharge, over-discharge, and short-circuit protection ensures reliable performance across power tools, robot vacuums, medical portable devices, AGV carts, and industrial handheld equipment. CE and UN38.3 certified, with full OEM customization available.

Key Specifications

5200mAh vs Nearby Capacities — Which to Choose?

⭐ 5200mAh sweet spot: 2600mAh is the most mature and cost-effective high-capacity 18650 cell size — better energy-per-dollar than 2500mAh with less cycle degradation than 3000mAh+ cells.

2S2P Cell Architecture

┌─────────────────────────────┐
│  String 1: [A]──────[B]     │  3.7V + 3.7V = 7.4V
│                ║             │
│  String 2: [C]──────[D]     │  3.7V + 3.7V = 7.4V
│         Parallel             │
│  Result: 7.4V / 5200mAh     │
│  4 × 2600mAh Grade A cells  │
└─────────────────────────────┘

BMS Protection Details

Applications

Runtime Estimation

📌 Based on 38.48Wh at 85% system efficiency.

Charging Guide

⚠️ Use 8.4V / 2S balance charger with JST-XH 3Pin balance connector only.

Default Package Configuration

OEM / Custom Options

Certification & Air Freight Status

✈️ At 38.48Wh, this pack comfortably sits within IATA Section II — the simplest and most cost-effective air freight category for lithium battery packs.

Why Choose Us?

• 🏭 Factory Direct — own 18650 pack assembly lines, zero intermediaries
• 🔋 2600mAh Grade A cells — mature, stable chemistry, best cycle life in class
• ⚖️ 4-cell BMS balancing — every pack cell-balanced before shipment
• ✈️ Section II air freight — 38.48Wh, lowest DG shipping complexity & cost
• 📋 CE + UN38.3 standard — full documentation included
• 🔬 10-day OEM sample — any capacity, connector, housing combination
• 🛠️ Full OEM service — spec engineering to certified mass production

📩 Contact us with your current draw, runtime target & housing spec — optimal 2S2P configuration quoted within 24 hours.