Convoy C8+ vs Convoy M21B size comparison
The Convoy M21B is 0.5 mm (0.02 in) shorter than the Convoy C8+, and 8.8 mm narrower at its widest point. Weights are published on different bases (listed vs listed), so compare them with care.
The Convoy M21B is 0.5 mm (0.02 in) shorter than the Convoy C8+, and 8.8 mm narrower at its widest point. Weights are published on different bases (listed vs listed), so compare them with care.
Dimensions
| Convoy C8+ Check price ↗ | Convoy M21B Check price ↗ | |
| Length | 142 mm (5.59 in) | 141.5 mm (5.57 in)−0.5 mm |
| Head / width | 44.5 mm (1.75 in) | 35.7 mm (1.41 in)−8.8 mm |
| Body | 25.2 mm (0.99 in) | 27.1 mm (1.07 in)+1.9 mm |
| Weight | 145 g listed | 120 g listed |
| Battery | 18650 | 21700 |
| Max output | — | — |
| Throw | — | — |
| Type | EDC | EDC |
| Price | from $24.99 at flashlightgo.com, as of Nov 4, 2026 | $48.99 at flashlightgo.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | flashlightgo.com sourced Output depends on LED option |
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
C8+ vs M21B: how they differ
Size and weight
The Convoy M21B is the shorter light: 141.5 mm (5.57 in) against 142 mm (5.59 in), a difference of 0.5 mm (0%). At its widest point the Convoy M21B is 8.8 mm slimmer (35.7 vs 44.5 mm). Weights are published on different bases (Convoy C8+: 145 g listed; Convoy M21B: 120 g listed), so they are not directly comparable.
Brightness and throw
Output for the Convoy C8+ and Convoy M21B depends on the LED option chosen.
Battery
The Convoy C8+ runs on a removable 18650 battery; the Convoy M21B runs on a removable 21700 battery. For scale, a 18650 cell is about 18 × 65 mm and a 21700 about 21 × 70 mm (nominal).
Price
When we checked on Nov 4, 2026, the Convoy C8+ was from $24.99 at flashlightgo.com and the Convoy M21B $48.99 at flashlightgo.com, so the Convoy C8+ cost $24.00 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 (8.8 mm narrower). On the specs we track, the Convoy M21B is ahead or level everywhere; the Convoy C8+ 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 C8+ Check price ↗ Convoy M21B
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
C8+ vs M21B FAQ
Which is smaller, the Convoy C8+ or the Convoy M21B?
The Convoy M21B is the shorter light: 141.5 mm (5.57 in) against 142 mm (5.59 in), a difference of 0.5 mm (0%). At its widest point the Convoy M21B is 8.8 mm slimmer (35.7 vs 44.5 mm). Weights are published on different bases (Convoy C8+: 145 g listed; Convoy M21B: 120 g listed), so they are not directly comparable.
Which is cheaper, the Convoy C8+ or the Convoy M21B?
When we checked on Nov 4, 2026, the Convoy C8+ was from $24.99 at flashlightgo.com and the Convoy M21B $48.99 at flashlightgo.com, so the Convoy C8+ cost $24.00 less. Prices change often, so check the current price before you buy.
Do the Convoy C8+ and Convoy M21B use the same battery?
The Convoy C8+ runs on a removable 18650 battery; the Convoy M21B runs on a removable 21700 battery. For scale, a 18650 cell is about 18 × 65 mm and a 21700 about 21 × 70 mm (nominal).
Compare Convoy C8+ with similar lights
Compare Convoy M21B with similar lights
More
Sources
- Convoy C8+: specs from manufacturer published specs as listed by flashlightgo.com. Price from $24.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- 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.
Found an error? Email liambuehlerbusiness@gmail.com and we will fix it.