When it comes to tactical and professional lighting, Weltool stands out as one of the few manufacturers that has turned flashlight customization into an exact science. Their modular system allows users to combine different heads, bodies, batteries, and tailcaps to create a tool that’s perfectly adapted to their needs — whether it’s for law enforcement, hunting, military operations, or everyday carry.

The concept behind Weltool’s design philosophy is simple yet brilliant: instead of locking users into a single flashlight model, the company provides a complete ecosystem of interchangeable components. Each light head, battery type, and tailcap can be mixed and matched with compatible parts, giving you total control over power, beam type, and interface.

Let’s dive deep into this modular world and discover how the system works — and how you can build your ideal setup.

1. The Modular Concept: Flexibility Without Compromise

Weltool’s ecosystem is structured around three primary components:

• Light Heads (LH and SF series)

• Bodies (W, BB, SF, and EDC series)

• Tailcaps (TC series and tactical adapters)
  

Each part is designed with precision threading and consistent voltage compatibility, ensuring seamless operation across models. This modularity means you can, for example, use the same LH5 high-CRI head on a compact 18350 body for EDC use, or on a larger 18650 body with a tactical tailcap forlonger runtime in the field.

The system isn’t random, it follows a carefully designed compatibility map that ensures power stability, beam optimization, and safe current handling.

2. Light Heads – The Heart of Illumination

Weltool’s LH series and SF series light heads represent the core of the system. Each one is tailored for a specific purpose, from high-intensity white beams to infrared (IR) and LEP projection.

LH Series Overview

Each LH head has a voltage range between 3.0 and 6.0 volts, depending on the model, and most are single-mode or dual-mode, providing either maximum output or simple two-level operation for field reliability.

For professional users, this modularity is golden — an investigator can swap between an IR head for covert work and a high-CRI head for forensic inspections without changing the whole flashlight.

SF Series Heads

The SF KE2-DF and KF2-A-DFT heads maintain compatibility with various body types and are optimized for tactical applications where beam focus and durability are critical. These heads pair exceptionally well with the SF MH60/61/62 series bodies, offering outstanding performance under extreme conditions.

3. Battery Options – Power for Every Mission

Weltool offers multiple power formats to balance runtime, weight, and size. The system supports:

• 16340

• 16650

• 18350

• 18650

• 2 × CR123A

Each cell type can drastically change the light’s behavior, from compact carry to extended endurance.

Weltool Battery Types

The second chart explains the naming system for Weltool batteries:

• UB: Built-in protection circuit and USB charging port — ideal for standalone charging.

• PB: Protected battery without USB port, to be charged externally.

• INR: Unprotected high-drain cell for maximum current output.
  

The last letter (e.g., UB, PB, INR) identifies its discharge characteristics: high-drain models are optimized for tactical bursts, while protected versions are safer for general users.

Examples of Battery Usage

• The 18350 cell is commonly used with BB6, W35, or BB3 bodies for compact tactical setups.

• The 18650 cell pairs with W65 or BB18+TC20 configurations for maximum runtime.

• The 16650 and CR123A pairs offer backup or alternate options for cold weather or extended storage.

By choosing the right power source, you can decide whether your Weltool becomes a long-range searchlight or a pocket-sized EDC companion.

4. Bodies and Extension Modules

The flashlight body acts as the connection between the light head and power source.
Weltool’s range includes several main types, each optimized for size, current capacity, and use case.

BB and W Series

• BB3 / BB6: Short bodies for 18350 batteries; great for tactical and weapon-mounted lights.

• W35 / W65: Longer bodies for 18650 batteries, offering better grip and runtime.

• BB18+TC20: High-current configuration designed for 18650 cells and powerful LEP heads.

Each body can handle different tailcaps and switch modules, depending on the current requirements (4A, 10A, or special indicator light functions). Some versions, such as W65, are also available with built-in USB-C charging, providing convenient power management on the go.The modularity allows users to choose between compactness or endurance, tactical mount or handheld, all using the same head module.

5. Tailcaps and Tactical Switch Modules (TC Series)

Weltool’s TC Series tailcaps are among the most technically refined in the flashlight industry. Each one is engineered for different electrical loads, activation styles, and mounting scenarios.

Tailcap Model Breakdown

This range ensures compatibility across different current demands and tactical configurations. For example:

• The TC70 or TC20 is ideal for LEP heads like LH18 or LH20 that require higher amperage.

• The TC59 allows integration with Surefire mounting systems for professionals using mixed equipment.

• The TC69L, with indicator light, is perfect for those who need instant visual battery feedback in the field.

6. Tactical and Practical Applications

One of the main strengths of the Weltool ecosystem lies in its adaptability. Below are several real-world setups that demonstrate how the components can be configured for different users.

A. Law Enforcement / Military

• Head: LH3 or LH18 LEP

• Body: W65

• Battery: 18650 (INR high-drain)

• Tailcap: TC70
  This configuration offers extreme throw distance with quick-response activation — perfect for search operations or long-range signaling.
  

B. Hunting and Outdoor

• Head: LH8-C (6500K) or LH9 (HCRI 5000K)

• Body: W35 or BB6

• Battery: 18350 (PB type for safety)

• Tailcap: TC69L with indicator
  This compact but bright combination gives hunters and outdoor users both visibility and battery awareness.
  

C. Covert / IR Operations

• Head: LH2 or LH6 IR LED

• Body: BB3

• Battery: 18350 (UB type)

• Tailcap: TC68N
  The small form factor and infrared output are ideal for night vision systems, allowing invisible illumination for cameras or scopes.
  

D. Inspection / Industrial

• Head: LH5 HCRI 4000K

• Body: W65 or BB18+TC20

• Battery: 18650 (PB or UB)

• Tailcap: TC59
  This combination ensures accurate color rendering and compatibility with professional tools — ideal for electrical, mechanical, or inspection tasks.
  

7. Accessory Ecosystem: Beyond the Basics

Weltool’s ecosystem extends further with several adapter and connector accessories:

• DF2E V2 adapter: For coupling smaller light heads with 16340 batteries.

• FR20 ring: Tactical finger ring for better weapon retention or grip control.

• SF Z68 / ZE68 switches: Momentary-on tailcaps for Surefire-style operation.

• SF DS00 / DSE remote switches: For rifle or carbine mounting.

• UE / UEE connectors: Provide remote pressure pad compatibility.

• EDC2-DFT Turbo body: Compact EDC body compatible with select SF heads for pocket carry setups.

Together, these components ensure that Weltool lights can transition seamlessly from handheld EDC to weapon-mounted tactical systems, all within the same product family.

8. Why the Modular Approach Matters

Traditional flashlights are often single-purpose — one body, one head, one use case. Weltool breaks this limitation by offering a system approach where the user defines the purpose.

• Future-proof design: You can upgrade to new light heads or batteries without replacing the entire unit.

• Cost-effective: Only purchase the parts you need instead of multiple flashlights.

• Custom performance: Adjust beam type, color temperature, or throw distance for each mission.

• Professional compatibility: Integrate with Surefire, Picatinny mounts, and other tactical hardware.

This is especially valuable for professionals like police officers, rescuers, and soldiers who require reliable, adaptable tools in changing environments.

9. Building Your Ideal Weltool System

If you’re new to the Weltool ecosystem, here’s a simple path to follow:

1. Choose your purpose – tactical, outdoor, inspection, or general EDC.

2. Select a head – LEP for throw, HCRI for color accuracy, IR for covert.

3. Pick a body – short (18350) for portability, long (18650) for runtime.

4. Match the power – choose PB for safe, INR for max performance.

5. Decide the tailcap – TC59 for Surefire systems, TC70 for high current.

This modular thinking gives you full control to evolve your flashlight as your needs change.

10. Conclusion: Precision, Power, and Possibility

The Weltool system represents more than a collection of flashlight parts — it’s a complete engineering philosophy. Every module, from the smallest battery to the largest LEP head, is crafted to integrate perfectly with the rest, delivering reliability and performance without compromise. Whether you’re a tactical operator, a hunter, or a gear enthusiast, Weltool’s modular platform offers something unique: a lighting tool that evolves with you. With its combination of precision machining, interchangeable design, and professional-grade performance, the Weltool modular system is not just a flashlight — it’s an entire ecosystem of light.