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Premium Lithium-Ion Batteries for Demanding Applications

Shenzhen Genju Technology – Manufacturer of SAFD & WORWORF branded 18650, 21700, LiFePO4, and low-temperature batteries. 16 years of expertise, 15+ patents, and Grade A cells for unmatched reliability.

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16+
Years Industry Experience
6
Production Lines
100+
Experienced Staff
24/7
Customer Support

About Shenzhen Genju Technology

Established in January 2018, Shenzhen Genju Technology Co., Ltd. is a high-tech enterprise integrating R&D, production, and sales, with 16 years of industry experience in lithium-ion battery development.

We are the proud developers of two premium battery brands: SAFD and WORWORF. With over 15 invention patents, our mission is to deliver innovative, safe, and reliable battery solutions for industrial, consumer, and renewable energy applications.

Our advanced production lines and strict quality control ensure every battery meets international safety and performance standards. From high-capacity 18650s to cold-weather LiFePO4 systems, SAFD is engineered for excellence.

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SAFD Battery Manufacturing Facility
2018

Our Premium Products

Discover our range of high-performance lithium-ion batteries, engineered for durability, safety, and maximum output in extreme conditions.

EVE INR21700 50PL Battery

EVE INR21700 50PL

High-power cylindrical lithium-ion battery for electric two-wheelers

  • Capacity: 5000mAh
  • Voltage: 3.6V
  • Max Discharge: 50A
  • Size: 21*70mm
Reliance 21700 RS40 Battery

Reliance 21700 RS40

Rechargeable lithium-ion battery with high cycle life

  • Capacity: 4000mAh
  • Voltage: 3.6V
  • Max Charge: 14A
  • Weight: ≤67.0g
Reliance 21700 RS50 Battery

Reliance 21700 RS50

Low-resistance high-discharge lithium-ion battery

  • Capacity: 5000mAh
  • Max Discharge: 70A
  • Max Charge: 15A
  • Life Cycle: 400+ cycles
EVE INR21700 50PL High-Power

EVE INR21700 50PL

High-power 5000mAh rechargeable lithium-ion battery

  • Capacity: 5000mAh
  • Max Discharge: 180A
  • Voltage: 3.6V
  • Weight: 72g
SAFD 15KWh Home Energy Storage

SAFD 15KWh LiFePO4 System

Grade A 48V 314Ah solar energy storage battery

  • Capacity: 15KWh
  • Voltage: 51.2V
  • Type: LiFePO4
  • Design: Stackable & Split
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SAFD 10KWh LiFePO4 System

Wall-mounted solar energy storage solution

  • Capacity: 10KWh
  • Voltage: 51.2V
  • Capacity: 200Ah
  • Application: Residential solar
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SAFD 18500 DB Digital Battery

High-capacity battery for digital cameras

  • Capacity: 2400mAh (nominal)
  • Min Capacity: 2300mAh
  • Size: 18500
  • Reference: Panasonic 18500A
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18650 Low-Temperature Battery

Engineered for cold-weather performance

  • Type: 18650
  • Application: Cold environments
  • Performance: Stable at -20°C
  • Chemistry: Advanced Li-ion
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Custom Battery Packs

Tailored solutions for OEMs and industrial use

  • Configurations: Any voltage/capacity
  • Cells: Grade A 18650/21700
  • Protection: BMS included
  • Applications: Medical, industrial, EV
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Why Choose SAFD Batteries?

Engineered with precision, tested for reliability, and trusted by professionals worldwide.

🔋

High Energy Density

Our 18650 and 21700 cells deliver up to 5000mAh capacity, outperforming standard batteries in the same form factor.

❄️

Cold Weather Performance

Low-temperature batteries maintain performance even at -20°C, ideal for outdoor and industrial applications.

⚡

High Discharge Rates

Capable of up to 180A continuous discharge, perfect for power tools, e-bikes, and high-drain devices.

🛡️

Safety First

Built-in protection circuits, flame-retardant materials, and rigorous testing ensure safe operation.

🔧

Custom Solutions

We design and manufacture custom battery packs for OEMs and specialized industrial applications.

🌍

Sustainable Energy Storage

Our LiFePO4 home energy systems support solar power, reducing carbon footprint and energy costs.

Trusted by Industry Leaders

16+
Years Experience
15+
Patents
6
Production Lines
100+
Skilled Engineers

Frequently Asked Questions

What is the difference between 18650 and 21700 batteries?

The 21700 battery is larger (21mm x 70mm) than the 18650 (18mm x 65mm), allowing for higher capacity and better thermal performance. 21700 cells typically offer 4000–5000mAh, while 18650s range from 2000–3500mAh.

Are SAFD batteries safe for high-drain devices?

Yes. Our high-rate discharge batteries, such as the Reliance 21700 RS50, are designed for up to 70A continuous discharge and are ideal for e-bikes, power tools, and drones.

Can I use SAFD LiFePO4 batteries for solar storage?

Absolutely. The SAFD 10KWh and 15KWh LiFePO4 systems are specifically engineered for residential solar energy storage, with long cycle life and built-in BMS for safety.

Do you offer custom battery pack solutions?

Yes. We provide fully customizable battery packs with your required voltage, capacity, connectors, and BMS. Contact us for OEM and industrial projects.

What is the warranty on SAFD batteries?

Most SAFD batteries come with a 12-month warranty. LiFePO4 energy storage systems are covered for up to 5 years, depending on usage and conditions.

Get in Touch

For product inquiries, custom orders, or technical support, visit the official SAFD Battery website.

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