Convoy M21B vs Fenix E40R size comparison
The Fenix E40R is 3.5 mm (0.14 in) shorter than the Convoy M21B, and 0.7 mm narrower at its widest point. Weights are published on different bases (with battery vs listed), so compare them with care.
The Fenix E40R is 3.5 mm (0.14 in) shorter than the Convoy M21B, and 0.7 mm narrower at its widest point. Weights are published on different bases (with battery vs listed), so compare them with care.
Dimensions
| Convoy M21B Check price ↗ | Fenix E40R Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 138 mm (5.43 in)−3.5 mm |
| Head / width | 35.7 mm (1.41 in) | 35 mm (1.38 in)−0.7 mm |
| Body | 27.1 mm (1.07 in) | 26.4 mm (1.04 in)−0.7 mm |
| Weight | 120 g listed | 220 g with battery |
| Battery | 21700 | 21700 |
| Max output | — | 5,000 lm |
| Throw | — | 242 m |
| Type | EDC | EDC |
| Price | $48.99 at flashlightgo.com, as of Nov 4, 2026 | $109.95 at fenixlighting.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | fenixlighting.com sourced Listed 35 mm wide x 26.4 mm high |
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M21B vs E40R: how they differ
Size and weight
The Fenix E40R is the shorter light: 138 mm (5.43 in) against 141.5 mm (5.57 in), a difference of 3.5 mm (2%). At its widest point the Fenix E40R is 0.7 mm slimmer (35 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix E40R: 220 g with battery), so they are not directly comparable.
Brightness and throw
The Fenix E40R is rated at 5,000 lm; we have no published maximum for the Convoy M21B. Output for the Convoy M21B depends on the LED option chosen.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Fenix E40R $109.95 at fenixlighting.com, so the Convoy M21B cost $60.96 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Fenix E40R if you want a shorter light (3.5 mm shorter). On the specs we track, the Fenix E40R is ahead or level everywhere; the Convoy M21B makes sense mainly if its price, interface or a feature we don't track suits you better. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Convoy M21B Check price ↗ Fenix E40R
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M21B vs E40R FAQ
Which is smaller, the Convoy M21B or the Fenix E40R?
The Fenix E40R is the shorter light: 138 mm (5.43 in) against 141.5 mm (5.57 in), a difference of 3.5 mm (2%). At its widest point the Fenix E40R is 0.7 mm slimmer (35 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix E40R: 220 g with battery), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the Fenix E40R?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Fenix E40R $109.95 at fenixlighting.com, so the Convoy M21B cost $60.96 less. Prices change often, so check the current price before you buy.
Do the Convoy M21B and Fenix E40R use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Convoy M21B with similar lights
Compare Fenix E40R with similar lights
More
Sources
- Convoy M21B: specs from manufacturer published specs as listed by flashlightgo.com. Price $48.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- Fenix E40R: specs from Fenix product page (manufacturer). Price $109.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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