Convoy S21E vs Nitecore T4K size comparison
The Nitecore T4K is 34.4 mm (1.35 in) shorter than the Convoy S21E, and 2.7 mm wider at its widest point. Weights are published on different bases (listed vs without battery), so compare them with care.
The Nitecore T4K is 34.4 mm (1.35 in) shorter than the Convoy S21E, and 2.7 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 T4K Check price ↗ | |
| Length | 116.4 mm (4.58 in) | 82 mm (3.23 in)−34.4 mm |
| Head / width | 27.3 mm (1.07 in) | 30 mm (1.18 in)+2.7 mm |
| Body | 27.3 mm (1.07 in) | — |
| Thickness | — | 29 mm (1.14 in) |
| Weight | 88 g without battery | 77 g listed |
| Battery | 21700 | Built-in |
| Max output | — | 4,000 lm |
| Throw | — | 209 m |
| Type | EDC | EDC |
| Price | from $27.99 at flashlightgo.com, as of Nov 4, 2026 | $89.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | batteryjunction.com sourced |
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S21E vs T4K: how they differ
Size and weight
The Nitecore T4K is the shorter light: 82 mm (3.23 in) against 116.4 mm (4.58 in), a difference of 34.4 mm (30%). At its widest point the Convoy S21E is 2.7 mm slimmer (27.3 vs 30 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; Nitecore T4K: 77 g listed), so they are not directly comparable.
Brightness and throw
The Nitecore T4K is rated at 4,000 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 Nitecore T4K runs on a built-in rechargeable battery. Only the Convoy S21E lets you swap in a charged spare.
Price
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the Nitecore T4K $89.95 at batteryjunction.com, so the Convoy S21E cost $61.96 less. Prices change often, so check the current price before you buy.
Type
Both are EDC lights in our catalog.
Which should you buy?
Choose the Convoy S21E if you want a slimmer profile (2.7 mm narrower) and a removable cell you can swap. Choose the Nitecore T4K if you want a shorter light (34.4 mm shorter) and a built-in battery with no separate cell to buy. We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Convoy S21E Check price ↗ Nitecore T4K
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
S21E vs T4K FAQ
Which is smaller, the Convoy S21E or the Nitecore T4K?
The Nitecore T4K is the shorter light: 82 mm (3.23 in) against 116.4 mm (4.58 in), a difference of 34.4 mm (30%). At its widest point the Convoy S21E is 2.7 mm slimmer (27.3 vs 30 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; Nitecore T4K: 77 g listed), so they are not directly comparable.
Which is cheaper, the Convoy S21E or the Nitecore T4K?
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the Nitecore T4K $89.95 at batteryjunction.com, so the Convoy S21E cost $61.96 less. Prices change often, so check the current price before you buy.
Do the Convoy S21E and Nitecore T4K use the same battery?
The Convoy S21E runs on a removable 21700 battery; the Nitecore T4K runs on a built-in rechargeable battery. Only the Convoy S21E lets you swap in a charged spare.
Compare Convoy S21E with similar lights
Compare Nitecore T4K 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 T4K: specs from manufacturer published specs as listed by batteryjunction.com. Price $89.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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