Convoy M21B vs Fenix UC35 V2.0 USB size comparison
The Fenix UC35 V2.0 USB is 1.5 mm (0.06 in) shorter than the Convoy M21B, and 10.3 mm narrower at its widest point. Weights are published on different bases (without battery vs listed), so compare them with care.
The Fenix UC35 V2.0 USB is 1.5 mm (0.06 in) shorter than the Convoy M21B, and 10.3 mm narrower at its widest point. Weights are published on different bases (without battery vs listed), so compare them with care.
Dimensions
| Convoy M21B Check price ↗ | Fenix UC35 V2.0 USB Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 140 mm (5.51 in)−1.5 mm |
| Head / width | 35.7 mm (1.41 in) | 25.4 mm (1.00 in)−10.3 mm |
| Body | 27.1 mm (1.07 in) | 23.5 mm (0.93 in)−3.6 mm |
| Weight | 120 g listed | 89 g without battery |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | — | 1,000 lm |
| Throw | — | 266 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 UC35 V2.0 USB: how they differ
Size and weight
The Fenix UC35 V2.0 USB is the shorter light: 140 mm (5.51 in) against 141.5 mm (5.57 in), a difference of 1.5 mm (1%). At its widest point the Fenix UC35 V2.0 USB is 10.3 mm slimmer (25.4 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix UC35 V2.0 USB: 89 g without battery), so they are not directly comparable.
Brightness and throw
The Fenix UC35 V2.0 USB is rated at 1,000 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 UC35 V2.0 USB 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 UC35 V2.0 USB $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 UC35 V2.0 USB if you want a slimmer profile (10.3 mm narrower). On the specs we track, the Fenix UC35 V2.0 USB 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 UC35 V2.0 USB
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
M21B vs UC35 V2.0 USB FAQ
Which is smaller, the Convoy M21B or the Fenix UC35 V2.0 USB?
The Fenix UC35 V2.0 USB is the shorter light: 140 mm (5.51 in) against 141.5 mm (5.57 in), a difference of 1.5 mm (1%). At its widest point the Fenix UC35 V2.0 USB is 10.3 mm slimmer (25.4 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix UC35 V2.0 USB: 89 g without battery), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the Fenix UC35 V2.0 USB?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Fenix UC35 V2.0 USB $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 UC35 V2.0 USB use the same battery?
The Convoy M21B runs on a removable 21700 battery; the Fenix UC35 V2.0 USB 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 UC35 V2.0 USB with similar lights
More
Sources
- Convoy M21B: specs from manufacturer published specs as listed by flashlightgo.com. Drawing: outline from published specs. Price $48.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- Fenix UC35 V2.0 USB: specs from Fenix product page (manufacturer). Drawing: outline from published specs. Price $89.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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