Convoy M21B vs Fenix PD36R ACE size comparison
The Fenix PD36R ACE is 4.5 mm (0.18 in) longer than the Convoy M21B, and 5.7 mm narrower at its widest point. Weights are published on different bases (with battery vs listed), so compare them with care.
The Fenix PD36R ACE is 4.5 mm (0.18 in) longer than the Convoy M21B, and 5.7 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 PD36R ACE Check price ↗ | |
| Length | 141.5 mm (5.57 in) | 146 mm (5.75 in)+4.5 mm |
| Head / width | 35.7 mm (1.41 in) | 30 mm (1.18 in)−5.7 mm |
| Body | 27.1 mm (1.07 in) | 26 mm (1.02 in)−1.1 mm |
| Weight | 120 g listed | 181.6 g with battery |
| Battery | 21700 | 21700 |
| Max output | — | 3,000 lm |
| Throw | — | 415 m |
| Type | EDC | EDC |
| Price | $48.99 at flashlightgo.com, as of Nov 4, 2026 | $109.95 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 PD36R ACE: how they differ
Size and weight
The Convoy M21B is the shorter light: 141.5 mm (5.57 in) against 146 mm (5.75 in), a difference of 4.5 mm (3%). At its widest point the Fenix PD36R ACE is 5.7 mm slimmer (30 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix PD36R ACE: 181.6 g with battery), so they are not directly comparable.
Brightness and throw
The Fenix PD36R ACE is rated at 3,000 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 PD36R ACE $109.95 at fenixlighting.com, so the Convoy M21B cost $60.96 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 shorter light (4.5 mm shorter). Choose the Fenix PD36R ACE if you want a slimmer profile (5.7 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Convoy M21B Check price ↗ Fenix PD36R ACE
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
M21B vs PD36R ACE FAQ
Which is smaller, the Convoy M21B or the Fenix PD36R ACE?
The Convoy M21B is the shorter light: 141.5 mm (5.57 in) against 146 mm (5.75 in), a difference of 4.5 mm (3%). At its widest point the Fenix PD36R ACE is 5.7 mm slimmer (30 vs 35.7 mm). Weights are published on different bases (Convoy M21B: 120 g listed; Fenix PD36R ACE: 181.6 g with battery), so they are not directly comparable.
Which is cheaper, the Convoy M21B or the Fenix PD36R ACE?
When we checked on Nov 4, 2026, the Convoy M21B was $48.99 at flashlightgo.com and the Fenix PD36R ACE $109.95 at fenixlighting.com, so the Convoy M21B cost $60.96 less. Prices change often, so check the current price before you buy.
Do the Convoy M21B and Fenix PD36R ACE 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 PD36R ACE 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 PD36R ACE: specs from Fenix product page (manufacturer). Drawing: shape measured from manufacturer photo (batteryjunction.com), scaled to the published length and diameter. Price $109.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
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