Li-Fe Rechargeable 26650 9.9v 3400mAh Battery PCM BMS Protected cell 3S1P

9.9V 3400mAh LiFePO4 Rechargeable Battery - 26650 Cell with BMS Protection

Professional-grade 9.9V 3400mAh Lithium Iron Phosphate (LiFePO4) rechargeable battery pack using premium 26650 cylindrical cells in 3S1P configuration. Features built-in BMS/PCM protection for safe operation and comes with Common T + DC5521 connector for easy installation. Perfect for portable devices, backup power, LED lights, and various 12V applications.

Key Features

• 26650 Cells: Large-capacity cylindrical cells (26mm diameter)
• BMS/PCM Protected: Built-in protection against overcharge, over-discharge, overcurrent
• High Capacity: 3400mAh for extended runtime
• LiFePO4 Chemistry: Safest lithium battery type with excellent stability
• Dual Connector: Common T + DC5521 for versatile connections
• Compact Design: 26mm × 79mm × 69mm
• Long Cycle Life: 2000+ charge cycles

Package Contents

• 1× 9.9V 3400mAh LiFePO4 Battery Pack with Common T + DC5521 connector

Technical Specifications

Nominal Voltage	9.9V (3S configuration)
Capacity	3400mAh (3.4Ah)
Energy	~33.66Wh
Chemistry	LiFePO4 (Lithium Iron Phosphate)
Cell Type	26650 Cylindrical
Configuration	3S1P (3 cells in series)
Dimensions	26mm × 79mm × 69mm
Weight	~303g
Connector Type	Common T + DC5521 (5.5mm × 2.1mm)
Protection	BMS/PCM (Battery Management System)
Charge Voltage	10.95V (3.65V per cell)
Discharge Cut-off	7.5V (2.5V per cell)
Cycle Life	2000+ cycles
Brand	FMA
Condition	Brand New

BMS/PCM Protection Features

Protection Type	Function
Overcharge Protection	Prevents charging above 10.95V
Over-discharge Protection	Cuts off at 7.5V to protect cells
Overcurrent Protection	Limits excessive current draw
Short Circuit Protection	Instantly cuts power if short detected
Cell Balancing	Ensures even charging across all cells

Common Applications

• Portable Devices: Handheld electronic equipment
• LED Lights: Portable LED lighting systems
• Backup Power: Emergency power backup
• Solar Systems: Small solar power storage
• Security Systems: Cameras and sensors
• Medical Devices: Portable medical equipment
• DIY Projects: Custom electronics requiring 9-12V power
• Outdoor Equipment: Camping and field equipment

Why Choose 26650 LiFePO4 Cells?

1. Large Capacity Cells:

• 26650 cells are larger than 18650 (26mm vs 18mm diameter)
• Higher capacity per cell (3400mAh)
• Better for high-drain applications
• More stable voltage under load

2. Superior Safety:

• LiFePO4 is the safest lithium chemistry
• Excellent thermal stability
• No risk of thermal runaway
• Built-in BMS adds extra protection layer

3. Long Lifespan:

• 2000+ charge cycles
• 5-10 year lifespan with proper care
• Minimal capacity degradation
• Better long-term value

4. Stable Performance:

• Consistent voltage throughout discharge
• Good performance in wide temperature range
• Low self-discharge rate (~3% per month)
• No memory effect

Connector Information

Common T Connector:

• Standard T-plug connector
• Commonly used in RC and hobby applications
• Secure connection with good current handling

DC5521 Connector:

• 5.5mm × 2.1mm barrel connector
• Widely used in LED lights and portable devices
• Easy to connect and disconnect
• Compatible with many standard DC power jacks

ℹ️ Need a Different Connector? Contact us with your requirements, and we can customize the connector type for you!

Installation Guide

✅ Easy Plug-and-Play Installation

Step 1: Choose the Right Connector

• Use Common T for RC applications or high-current devices
• Use DC5521 for LED lights and standard DC devices
• Verify your device's connector type before connecting

Step 2: Connect Battery

• Match connector polarity (usually marked on device)
• Insert connector firmly until seated
• Ensure secure connection

Step 3: Test Operation

• Power on device
• Verify normal operation
• Monitor for any unusual behavior

Step 4: Charging

• Use LiFePO4-compatible charger (10.95V for 3S)
• Connect charger to appropriate port
• Charge until BMS indicates full (typically 2-4 hours)

Charging Information

Charger Requirements:

• Use LiFePO4-compatible charger (10.95V for 3S)
• Do NOT use standard 12V lead-acid chargers
• Recommended charge current: 1-2A
• Charging time: 2-4 hours (depending on charger)

BMS Protection During Charging:

• BMS automatically stops charging at 10.95V
• Prevents overcharging damage
• Balances cells for optimal performance
• Safe to leave connected (BMS will protect)

Safety Information

Charging: Use only LiFePO4-compatible chargers (10.95V for 3S). BMS provides overcharge protection.

Storage: Store at 40-60% charge in cool, dry place.

Operation: Do not short-circuit, puncture, crush, or disassemble the battery.

Temperature: Charge: 0-45°C, Discharge: -20-60°C, Storage: -20-35°C.

Disposal: Dispose according to local regulations. LiFePO4 is non-toxic but should be recycled.

BMS Protection: Built-in Battery Management System protects against overcharge, over-discharge, overcurrent, and short circuit.

Connector Care: Keep connectors clean and dry. Do not force connections.

Shipping & Transportation Notice

Hazardous Material: This product contains lithium batteries and is classified as dangerous goods for shipping purposes.

Air Transport Restrictions: Due to international air transport regulations, battery shipments may be subject to additional restrictions and longer transit times.

Packaging Compliance: All shipments comply with UN3480 or UN3481 packaging requirements for lithium batteries.

Delivery Time: Battery-containing parcels may experience extended delivery times due to stricter customs inspections and carrier handling procedures.