18650 Battery Pack Custom 1S~4S 2P~6P 3.7V 7.4V 11.1V 14.8V Rechargeable Li-ion Pack for Power Tool Laptop E-bike Robot Power Station | OEM ODM Factory Direct

🔋 Custom 18650 Battery Pack — 3.7V ~ 14.8V Multi-Cell Rechargeable Li-ion Pack | 1S~4S / 1P~6P OEM Solutions

Overview

We manufacture fully customized 18650 lithium-ion battery packs covering single-cell to multi-cell configurations from 1S1P to 4S4P — delivering voltages from 3.7V to 14.8V and capacities from 2000mAh to 24,000mAh+. Each pack is assembled with premium Grade A 18650 cells, integrated BMS with cell balancing, and your choice of connector, wire gauge, housing, and branding. Whether you need a compact 1S2P power bank core or a high-capacity 4S4P industrial pack, we engineer it to your exact specification with CE and UN38.3 certification support.

Configuration Matrix

📌 Capacity per string based on 2000mAh/cell standard. Higher capacity cells (2500 / 3000 / 3500mAh) available — contact us for upgraded spec.

Popular Configuration Quick Reference

Standard Cell Specifications

Series vs Parallel — Engineering Logic

SERIES (S) increases VOLTAGE:
1S = 3.7V │ 2S = 7.4V │ 3S = 11.1V │ 4S = 14.8V

PARALLEL (P) increases CAPACITY:
1P = 2000mAh │ 2P = 4000mAh │ 3P = 6000mAh │ 6P = 12000mAh

COMBINED example — 3S2P:
├── String 1: Cell A → Cell B → Cell C (11.1V / 2000mAh)
└── String 2: Cell D → Cell E → Cell F (11.1V / 2000mAh)
    Parallel → 11.1V / 4000mAh = 44.4Wh total

📌 Rule: Add S to raise voltage for higher-power motors & systems. Add P to extend runtime. Combine both for maximum power AND endurance.

BMS Features — All Packs

Applications by Configuration

Charging Requirements by Configuration

⚠️ Always use a charger matching the S (series) count of your pack. Mismatched chargers will damage cells or cause safety hazards.

Housing & Assembly Options

OEM / Custom Specification Form

IATA Air Freight Compliance by Configuration

✈️ Logistics tip: For packs ≤100Wh we strongly recommend finalizing at 4S3P (88.8Wh) to stay within Section IB limits — significantly simpler and cheaper air freight than Section IA.

Certification & Compliance

Why Choose Us?

• 🏭 Factory Direct — own 18650 pack assembly lines, zero intermediaries
• 📐 Full matrix coverage — 1S1P to 4S4P, any combination from one supplier
• ⚖️ BMS cell balancing standard — every multi-cell pack balanced before shipment
• 🔋 Grade A cells only — no B-grade, no refurbished cells, capacity verified
• 📋 CE + UN38.3 ready — full DG documentation for global procurement
• ✈️ Logistics consulting — we advise optimal configuration to minimize DG shipping cost
• 🔬 10-day OEM sample — any configuration, any connector, rapid turnaround
• 🛠️ Full OEM service — from spec sheet to certified mass production

📩 Tell us your voltage, capacity, current draw & housing requirements — we’ll design and quote the optimal 18650 pack configuration within 24 hours.