7.4V Li-ion Rechargeable Battery Pack 8800-14000mAh 2S4P with PCM for Bike Light Flashlight Headlight

7.4V Li-ion Rechargeable Battery Pack (2S4P) with PCM Protection

High-capacity 7.4V lithium-ion battery pack designed for Magicshine bike lights, LED flashlights, headlights, and other 7.4V DC-powered devices. Built with premium 18650 cells in a 2S4P configuration, featuring a built-in Protection Circuit Module (PCM) for safe and reliable operation.

Applications

• Magicshine series bike lights (MJ-900, MJ-906, MJ-908, MJ-902, etc.)
• LED flashlights and tactical lights
• Bicycle headlights and tail lights
• Outdoor headlamps and camping lanterns
• Portable power supply for 7.4V DC devices
• Photography equipment and video lights

Key Specifications

• Nominal Voltage: 7.4V (2S)
• Capacity Options: 8800mAh / 10400mAh / 12000mAh / 13200mAh / 14000mAh
• Configuration: 2S4P (8 cells in 2-series 4-parallel)
• Connector: DC 5.5/2.1mm (center positive)
• Dimensions: 36 × 36 × 136 mm
• Cell Diameter: 18.0 ± 0.7 mm per cell
• Cell Height: 65.0 ± 1.0 mm per cell
• Cell Packaging: PVC heat shrink tube
• PCM: Built-in Protection Circuit Module
• Condition: Brand New

PCM Protection Functions

The built-in Protection Circuit Module (PCM) provides comprehensive safety protection:

• Over-charge protection
• Over-discharge protection
• Short circuit protection
• Over-current protection
• Reverse charge protection
• Over-heat protection

Operating Environment

• Charging Temperature: 0°C to 45°C (32°F to 113°F)
• Discharging Temperature: -20°C to 60°C (-4°F to 140°F)
• Storage Temperature: -10°C to 35°C (14°F to 95°F)
• Humidity: Keep dry; avoid use in rain or high-humidity environments without waterproof protection
• Altitude: Suitable for general outdoor use; performance may decrease at extreme altitudes

Installation Instructions

• Connect the DC 5.5/2.1mm plug to your device's power input port — ensure center pin is positive (+)
• Verify your device accepts 7.4V input before connecting
• Do not force the connector; align properly before inserting
• Use a compatible Li-ion charger rated for 2S (8.4V max charge voltage) to recharge the battery
• Do not mix with other battery packs or connect in series/parallel without proper knowledge

Storage Precautions

• Store at 40–60% charge level for long-term storage (3 months or more)
• Store in a cool, dry place away from direct sunlight and heat sources
• Keep away from flammable materials and metal objects that may cause short circuits
• Do not store in temperatures below -10°C or above 35°C
• Recharge every 3–6 months during long-term storage to prevent over-discharge
• Keep out of reach of children

Package Contents

• 1 × 7.4V Li-ion Battery Pack (2S4P)

Safety Information

Charging: Use only a compatible Li-ion charger with 8.4V max output. Never leave charging unattended for extended periods. Stop charging immediately if the battery becomes excessively hot, swells, or emits unusual odors.

Storage: Store in a fireproof container or Li-ion safety bag when not in use for extended periods. Never store in a fully discharged state.

Operation: Do not puncture, crush, disassemble, or expose to fire. Do not short-circuit the terminals. Discontinue use if the battery shows signs of damage, swelling, or leakage.

Temperature: Do not charge or discharge outside the specified temperature range. Extreme temperatures reduce performance and may cause safety hazards.

Disposal: Do not dispose of in regular household waste. Recycle at designated battery collection points in accordance with local regulations.

Inspection: Inspect the battery before each use. Do not use if the casing is cracked, the connector is damaged, or the battery appears swollen.

Shipping & Transportation Notice

This product contains lithium-ion cells and is classified as a dangerous good (Class 9) for transportation purposes.

• Air Transport: Subject to IATA regulations. May be restricted or prohibited on certain air routes. Please check with your carrier before ordering for air shipment.
• Packaging: Shipped in compliance with UN38.3 testing standards and applicable dangerous goods packaging requirements.
• Delivery Time: Due to customs and carrier restrictions on lithium batteries, delivery may take longer than standard shipments.
• Documentation: Required safety data sheets and dangerous goods declarations are included with shipment where required.