Convoy S21E vs Olight ArkPro Ultra size comparison
The Olight ArkPro Ultra is 7.6 mm (0.30 in) longer than the Convoy S21E, with about the same max diameter/width. Weights are published on different bases (with battery vs without battery), so compare them with care.
The Olight ArkPro Ultra is 7.6 mm (0.30 in) longer than the Convoy S21E, with about the same max diameter/width. Weights are published on different bases (with battery vs without battery), so compare them with care.
Dimensions
| Convoy S21E Check price ↗ | Olight ArkPro Ultra Check price ↗ | |
| Length | 116.4 mm (4.58 in) | 124 mm (4.88 in)+7.6 mm |
| Head / width | 27.3 mm (1.07 in) | 27 mm (1.06 in)−0.3 mm |
| Body | 27.3 mm (1.07 in) | — |
| Thickness | — | 16 mm (0.63 in) |
| Weight | 88 g without battery | 120 g with battery |
| Battery | 21700 | Built-in |
| Max output | — | 1,700 lm |
| Throw | — | 205 m |
| Type | EDC | EDC |
| Price | from $27.99 at flashlightgo.com, as of Nov 4, 2026 | $129.99 at olight.com, as of Nov 4, 2026 |
| Source | flashlightgo.com sourced Output depends on LED option | olight.com sourced |
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S21E vs ArkPro Ultra: how they differ
Size and weight
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 124 mm (4.88 in), a difference of 7.6 mm (6%). At their widest points they are about the same (27.3 vs 27 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; Olight ArkPro Ultra: 120 g with battery), so they are not directly comparable.
Brightness and throw
The Olight ArkPro Ultra is rated at 1,700 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 Olight ArkPro Ultra 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 Olight ArkPro Ultra $129.99 at olight.com, so the Convoy S21E cost $102.00 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 shorter light (7.6 mm shorter) and a removable cell you can swap. Choose the Olight ArkPro Ultra if you want 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 ↗ Olight ArkPro Ultra
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S21E vs ArkPro Ultra FAQ
Which is smaller, the Convoy S21E or the Olight ArkPro Ultra?
The Convoy S21E is the shorter light: 116.4 mm (4.58 in) against 124 mm (4.88 in), a difference of 7.6 mm (6%). At their widest points they are about the same (27.3 vs 27 mm). Weights are published on different bases (Convoy S21E: 88 g without battery; Olight ArkPro Ultra: 120 g with battery), so they are not directly comparable.
Which is cheaper, the Convoy S21E or the Olight ArkPro Ultra?
When we checked on Nov 4, 2026, the Convoy S21E was from $27.99 at flashlightgo.com and the Olight ArkPro Ultra $129.99 at olight.com, so the Convoy S21E cost $102.00 less. Prices change often, so check the current price before you buy.
Do the Convoy S21E and Olight ArkPro Ultra use the same battery?
The Convoy S21E runs on a removable 21700 battery; the Olight ArkPro Ultra 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 Olight ArkPro Ultra 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.
- Olight ArkPro Ultra: specs from Olight product page (manufacturer). Drawing: shape measured from manufacturer photo (batteryjunction.com), scaled to the published length and diameter. Price $129.99 from olight.com, checked Nov 4, 2026; prices change often.
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