Convoy M21B vs Fenix LD35R size comparison
The Fenix LD35R is 5.1 mm (0.20 in) shorter than the Convoy M21B, and 1.7 mm narrower at its widest point. Weights are published on different bases (with battery vs listed), so compare them with care.
The Fenix LD35R is 5.1 mm (0.20 in) shorter than the Convoy M21B, and 1.7 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 LD35R Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 136.4 mm (5.37 in)−5.1 mm |
| Head / width | 35.7 mm (1.41 in) | 34 mm (1.34 in)−1.7 mm |
| Body | 27.1 mm (1.07 in) | 25.4 mm (1.00 in)−1.7 mm |
| Weight | 120 g listed | 185 g with battery |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | — | 1,800 lm |
| Throw | — | 337 m |
| Type | EDC | EDC |
| Price | $48.99 at flashlightgo.com, as of Nov 4, 2026 | $89.95 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 LD35R: how they differ
Size and weight
The Fenix LD35R is the shorter light: 136.4 mm (5.37 in) against 141.5 mm (5.57 in), a difference of 5.1 mm (4%). At its widest point the Fenix LD35R is 1.7 mm slimmer (34 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix LD35R: 185 g with battery), so they are not directly comparable.
Brightness and throw
The Fenix LD35R is rated at 1,800 lm; we have no published maximum for the Convoy M21B. Output for the Convoy M21B depends on the LED option chosen.
Battery
The Convoy M21B runs on a removable 21700 battery; the Fenix LD35R runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Price
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Fenix LD35R $89.95 at fenixlighting.com, so the Convoy M21B cost $40.96 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 LD35R if you want a shorter light (5.1 mm shorter) and a slimmer profile (1.7 mm narrower). On the specs we track, the Fenix LD35R 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 LD35R
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
M21B vs LD35R FAQ
Which is smaller, the Convoy M21B or the Fenix LD35R?
The Fenix LD35R is the shorter light: 136.4 mm (5.37 in) against 141.5 mm (5.57 in), a difference of 5.1 mm (4%). At its widest point the Fenix LD35R is 1.7 mm slimmer (34 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix LD35R: 185 g with battery), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the Fenix LD35R?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Fenix LD35R $89.95 at fenixlighting.com, so the Convoy M21B cost $40.96 less. Prices change often, so check the current price before you buy.
Do the Convoy M21B and Fenix LD35R use the same battery?
The Convoy M21B runs on a removable 21700 battery; the Fenix LD35R runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Convoy M21B with similar lights
Compare Fenix LD35R 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 LD35R: specs from Fenix product page (manufacturer). Price $89.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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