Convoy M21H 21700 Flashlight with Joinsun 21700 Battery (INR21700-50E Lithium Cells)

Blog | Published by Alex on August 16, 2025

Convoy M21H 21700 Flashlight

The Convoy M21H is a high-performance 21700 flashlight from Convoy, powered by a 21700 battery (lithium-ion). It combines high brightness, compact design, and versatile functionality. Designed for outdoor adventures, night-time work, and everyday carry, it has earned a solid reputation among flashlight enthusiasts due to its excellent optical system and cost-performance ratio.

Specifications of Convoy M21H

Material: Aluminum alloy with MAO anodized finish for a comfortable and anti-slip grip
Dimensions: Length 130.8mm, head diameter 40mm, tail diameter 28.5mm, weight approximately 132g
Battery: 1 × 21700 battery (Optional: Joinsun 21700 Battery INR 21700-50E 5Ah 5000mAh NCM), compatible with some 18650 batteries
Charging: Onboard charging via USB-C, supporting up to 2A current
Safety Features: Low voltage warning, reverse polarity protection, over-temperature protection
Waterproof: None
Flashlight Category: General Purpose

LED and Beam Characteristics

The M21H is equipped with Cree XHP70.3 HI R9050 LED and a 12°TIR lens, delivering a smooth and focused beam.

LED Model: Cree XHP70.3 HI R9050
Output: ~3000 lumens
Features: High brightness, medium color temperature, strong throw for everyday and outdoor use

Real user feedback highlights that the TIR lens paired with the LED emitter is crucial for beam uniformity and throw. One user reported that their M21H with XHP70.3 HI R70 LED produced a highly concentrated and even beam. In comparisons with other Convoy H-series models, the H4 with XHP50.2 can achieve a similar beam profile, while the H3, despite having XHP50.3 HI R70, lacks a TIR lens, resulting in a less uniform beam. This demonstrates the importance of optical design and LED selection for beam performance and reinforces M21H’s advantages in high-brightness, long-throw applications.

Operation Modes

Convoy M21H features a side switch with multiple operation modes, including 4 main levels + smooth ramping and blinkies:

Main Brightness Modes: 4 fixed levels + smooth ramping, adjustable by holding the button
Blinkies: Strobe, SOS
Moonlight Mode: Ultra-low output (0.2%)
Turbo Mode: Double-click for maximum brightness
Tactical Mode: Four clicks for maximum output only
Voltage Check: Five clicks to display battery voltage
Lockout Mode: Ten clicks to prevent accidental activation

Additionally, the M21H supports mode memory, restoring the last used brightness after power-off. Users generally find the interface intuitive, though the side switch may be harder to locate in complete darkness.

Safety Features

Low Voltage Warning: Protects battery from over-discharge
Reverse Polarity Protection: Prevents damage from incorrect battery insertion
Over-Temperature Protection: Adjusts output automatically during prolonged high-brightness use

These features ensure safe and stable operation, even under high-power output.

User Feedback and Product Comparison

Based on real user experiences:

Brightness & Color Temperature: XHP70.3 HI R70 provides high output with favorable color temperature, ideal for outdoor throw
Optical Advantage: TIR lens offers uniform beam and focused throw, outperforming non-TIR models like the H3
Ergonomics & Finish: MAO anodized surface is grippy and durable, but can show scratches
Cost-Performance: Compared to other high-end brands, the M21H delivers exceptional throw and brightness at a reasonable price

Users also note that selecting a similar emitter and optical setup in H-series models can approximate the M21H’s beam, but the native M21H configuration remains superior in performance and usability.

Recommended Use Cases

Outdoor Activities: Camping, hiking, and night-time exploration; XHP70.3 HI R70 with TIR lens provides sufficient brightness and throw
Everyday Carry: Compact design with comfortable MAO finish
Professional Use: Comprehensive safety features for long-duration operation
Budget-Friendly Option: High cost-performance for enthusiasts and beginners

Summary

The Convoy M21H 21700 flashlight is a high-performance flashlight combining high brightness, long throw, versatile operation, and safety protection. The combination of TIR lens and Cree XHP70.3 HI R9050 LED ensures a smooth, focused, and far-reaching beam. With real user feedback and comparisons, M21H excels in outdoor, general-purpose, and professional scenarios while offering excellent value, making it a top choice for flashlight enthusiasts.

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