Convoy S21E vs RovyVon S3 Pro size comparison
The RovyVon S3 Pro is 2.6 mm (0.10 in) longer than the Convoy S21E, and 1.7 mm wider at its widest point. Weights are published on different bases (listed vs without battery), so compare them with care.
The RovyVon S3 Pro is 2.6 mm (0.10 in) longer than the Convoy S21E, and 1.7 mm wider at its widest point. Weights are published on different bases (listed vs without battery), so compare them with care.
Dimensions
| Convoy S21E Check price ↗ | RovyVon S3 Pro Check price ↗ | |
| Length | 116.4 mm (4.58 in) | 119 mm (4.69 in)+2.6 mm |
| Head / width | 27.3 mm (1.07 in) | 29 mm (1.14 in)+1.7 mm |
| Body | 27.3 mm (1.07 in) | 29 mm (1.14 in)+1.7 mm |
| Weight | 88 g without battery | 150 g listed |
| Battery | 21700 | 18650 |
| Max output | — | 2,800 lm |
| Throw | — | 130 m |
| Type | EDC | EDC |
| Price | from $27.99 at flashlightgo.com, as of Nov 4, 2026 | from $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | batteryjunction.com sourced |
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
S21E vs S3 Pro: how they differ
Size and weight
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 119 mm (4.69 in), a difference of 2.6 mm (2%). At its widest point the Convoy S21E is 1.7 mm slimmer (27.3 vs 29 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; RovyVon S3 Pro: 150 g listed), so they are not directly comparable.
Brightness and throw
The RovyVon S3 Pro is rated at 2,800 lm; we have no published maximum for the Convoy S21E. Output for the Convoy S21E depends on the LED option chosen.
Battery
The Convoy S21E runs on a removable 21700 battery; the RovyVon S3 Pro runs on a removable 18650 battery. 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 S21E was from $27.99 at flashlightgo.com and the RovyVon S3 Pro from $79.95 at batteryjunction.com, so the Convoy S21E cost $51.96 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 S21E if you want a slimmer profile (1.7 mm narrower). On the specs we track, the Convoy S21E is ahead or level everywhere; the RovyVon S3 Pro 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 S21E Check price ↗ RovyVon S3 Pro
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
S21E vs S3 Pro FAQ
Which is smaller, the Convoy S21E or the RovyVon S3 Pro?
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 119 mm (4.69 in), a difference of 2.6 mm (2%). At its widest point the Convoy S21E is 1.7 mm slimmer (27.3 vs 29 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; RovyVon S3 Pro: 150 g listed), so they are not directly comparable.
Which is cheaper, the Convoy S21E or the RovyVon S3 Pro?
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the RovyVon S3 Pro from $79.95 at batteryjunction.com, so the Convoy S21E cost $51.96 less. Prices change often, so check the current price before you buy.
Do the Convoy S21E and RovyVon S3 Pro use the same battery?
The Convoy S21E runs on a removable 21700 battery; the RovyVon S3 Pro runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Convoy S21E with similar lights
Compare RovyVon S3 Pro with similar lights
More
Sources
- Convoy S21E: specs from manufacturer published specs as listed by flashlightgo.com. Drawing: outline from published specs. Price from $27.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- RovyVon S3 Pro: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price from $79.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
Found an error? Email contact@flashlighthero.com and we will fix it.