Convoy M21B vs ThruNite TC20 V3 size comparison
The ThruNite TC20 V3 is 16.5 mm (0.65 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 ThruNite TC20 V3 is 16.5 mm (0.65 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 ↗ | ThruNite TC20 V3 Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 125 mm (4.92 in)−16.5 mm |
| Head / width | 35.7 mm (1.41 in) | 35 mm (1.38 in)−0.7 mm |
| Body | 27.1 mm (1.07 in) | 28 mm (1.10 in)+0.9 mm |
| Weight | 120 g listed | 197 g with battery |
| Battery | 21700 | 21700 |
| Max output | — | 4,720 lm |
| Throw | — | — |
| Type | EDC | EDC |
| Price | $48.99 at flashlightgo.com, as of Nov 4, 2026 | $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | batteryjunction.com sourced |
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M21B vs TC20 V3: how they differ
Size and weight
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 141.5 mm (5.57 in), a difference of 16.5 mm (12%). At its widest point the ThruNite TC20 V3 is 0.7 mm slimmer (35 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; ThruNite TC20 V3: 197 g with battery), so they are not directly comparable.
Brightness and throw
The ThruNite TC20 V3 is rated at 4,720 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 ThruNite TC20 V3 $79.95 at batteryjunction.com, so the Convoy M21B cost $30.96 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 ThruNite TC20 V3 if you want a shorter light (16.5 mm shorter). On the specs we track, the ThruNite TC20 V3 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 ↗ ThruNite TC20 V3
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
M21B vs TC20 V3 FAQ
Which is smaller, the Convoy M21B or the ThruNite TC20 V3?
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 141.5 mm (5.57 in), a difference of 16.5 mm (12%). At its widest point the ThruNite TC20 V3 is 0.7 mm slimmer (35 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; ThruNite TC20 V3: 197 g with battery), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the ThruNite TC20 V3?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the Convoy M21B cost $30.96 less. Prices change often, so check the current price before you buy.
Do the Convoy M21B and ThruNite TC20 V3 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 ThruNite TC20 V3 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.
- ThruNite TC20 V3: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $79.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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