Convoy S21E vs Nitecore E4K size comparison
The Nitecore E4K is 0.6 mm (0.02 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 Nitecore E4K is 0.6 mm (0.02 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 ↗ | Nitecore E4K Check price ↗ | |
| Length | 116.4 mm (4.58 in) | 117 mm (4.61 in)+0.6 mm |
| Head / width | 27.3 mm (1.07 in) | 29 mm (1.14 in)+1.7 mm |
| Body | 27.3 mm (1.07 in) | 26 mm (1.02 in)−1.3 mm |
| Weight | 88 g without battery | 80 g listed |
| Battery | 21700 | 21700 |
| Max output | — | 4,400 lm |
| Throw | — | 211 m |
| Type | EDC | EDC |
| Price | from $27.99 at flashlightgo.com, as of Nov 4, 2026 | not verified yet |
| Source | flashlightgo.com sourced Output depends on LED option | batteryjunction.com sourced |
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S21E vs E4K: how they differ
Size and weight
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 117 mm (4.61 in), a difference of 0.6 mm (1%). 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; Nitecore E4K: 80 g listed), so they are not directly comparable.
Brightness and throw
The Nitecore E4K is rated at 4,400 lm; we have no published maximum for the Convoy S21E. Output for the Convoy S21E depends on the LED option chosen.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
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 Nitecore E4K 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 ↗ Nitecore E4K
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
S21E vs E4K FAQ
Which is smaller, the Convoy S21E or the Nitecore E4K?
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 117 mm (4.61 in), a difference of 0.6 mm (1%). 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; Nitecore E4K: 80 g listed), so they are not directly comparable.
Do the Convoy S21E and Nitecore E4K use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Convoy S21E with similar lights
Compare Nitecore E4K with similar lights
More
Sources
- Convoy S21E: specs from manufacturer published specs as listed by flashlightgo.com. Price from $27.99 from flashlightgo.com, checked Nov 4, 2026; prices change often.
- Nitecore E4K: specs from manufacturer published specs as listed by batteryjunction.com. No verified price yet.
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