Convoy M21B vs Fenix LD36R size comparison
The Fenix LD36R is 1.9 mm (0.07 in) shorter than the Convoy M21B, and 4.3 mm wider at its widest point. Weights are published on different bases (with battery vs listed), so compare them with care.
The Fenix LD36R is 1.9 mm (0.07 in) shorter than the Convoy M21B, and 4.3 mm wider 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 LD36R Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 139.6 mm (5.50 in)−1.9 mm |
| Head / width | 35.7 mm (1.41 in) | 40 mm (1.57 in)+4.3 mm |
| Body | 27.1 mm (1.07 in) | 26.5 mm (1.04 in)−0.6 mm |
| Weight | 120 g listed | 231 g with battery |
| Battery | 21700 | 21700 |
| Max output | — | 3,600 lm |
| Throw | — | 385 m |
| Type | EDC | EDC |
| Price | $48.99 at flashlightgo.com, as of Nov 4, 2026 | from $114.95 at fenixlighting.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | fenixlighting.com sourced |
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M21B vs LD36R: how they differ
Size and weight
The Fenix LD36R is the shorter light: 139.6 mm (5.50 in) against 141.5 mm (5.57 in), a difference of 1.9 mm (1%). At its widest point the Convoy M21B is 4.3 mm slimmer (35.7 vs 40 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix LD36R: 231 g with battery), so they are not directly comparable.
Brightness and throw
The Fenix LD36R is rated at 3,600 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 LD36R from $114.95 at fenixlighting.com, so the Convoy M21B cost $65.96 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 Convoy M21B if you want a slimmer profile (4.3 mm narrower). On the specs we track, the Convoy M21B is ahead or level everywhere; the Fenix LD36R 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 LD36R
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M21B vs LD36R FAQ
Which is smaller, the Convoy M21B or the Fenix LD36R?
The Fenix LD36R is the shorter light: 139.6 mm (5.50 in) against 141.5 mm (5.57 in), a difference of 1.9 mm (1%). At its widest point the Convoy M21B is 4.3 mm slimmer (35.7 vs 40 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix LD36R: 231 g with battery), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the Fenix LD36R?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Fenix LD36R from $114.95 at fenixlighting.com, so the Convoy M21B cost $65.96 less. Prices change often, so check the current price before you buy.
Do the Convoy M21B and Fenix LD36R 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 LD36R 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 LD36R: specs from Fenix product page (manufacturer). Price from $114.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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