Olight Seeker Ultra vs ThruNite TC20 V3 size comparison
The ThruNite TC20 V3 is 13 mm (0.51 in) shorter than the Olight Seeker Ultra, with about the same max diameter/width. It is 23 g lighter (with battery).
The ThruNite TC20 V3 is 13 mm (0.51 in) shorter than the Olight Seeker Ultra, with about the same max diameter/width. It is 23 g lighter (with battery).
Dimensions
| Olight Seeker Ultra Check price ↗ | ThruNite TC20 V3 Check price ↗ | |
| Length | 138 mm (5.43 in) | 125 mm (4.92 in)−13 mm |
| Head / width | 35 mm (1.38 in) | 35 mm (1.38 in)same |
| Body | 28 mm (1.10 in) | 28 mm (1.10 in)same |
| Weight | 220 g with battery | 197 g with battery−23 g |
| Battery | 21700 | 21700 |
| Max output | 4,800 lm | 4,720 lm |
| Throw | 265 m | — |
| Type | EDC | EDC |
| Price | $169.99 at olight.com, as of Nov 4, 2026 | $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | olight.com sourced Body diameter and throw from Battery Junction | batteryjunction.com sourced |
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Seeker Ultra vs TC20 V3: how they differ
Size and weight
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 138 mm (5.43 in), a difference of 13 mm (9%). At their widest points they are about the same (35 vs 35 mm). The ThruNite TC20 V3 is 23 g lighter (197 g vs 220 g, with battery).
Brightness and throw
The Olight Seeker Ultra is rated brighter: 4,800 lm maximum vs 4,720 lm for the ThruNite TC20 V3, 2% more.
Battery
Both run on a removable 21700 battery, so spare cells work in either light.
Price
When we checked on Nov 4, 2026, the Olight Seeker Ultra was $169.99 at olight.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $90.04 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 ThruNite TC20 V3 if you want a shorter light (13 mm shorter) and less weight (23 g lighter). On the specs we track, the ThruNite TC20 V3 is ahead or level everywhere; the Olight Seeker Ultra 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 ↗ Olight Seeker Ultra Check price ↗ ThruNite TC20 V3
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Seeker Ultra vs TC20 V3 FAQ
Which is smaller, the Olight Seeker Ultra or the ThruNite TC20 V3?
The ThruNite TC20 V3 is the shorter light: 125 mm (4.92 in) against 138 mm (5.43 in), a difference of 13 mm (9%). At their widest points they are about the same (35 vs 35 mm). The ThruNite TC20 V3 is 23 g lighter (197 g vs 220 g, with battery).
Which is brighter, the Olight Seeker Ultra or the ThruNite TC20 V3?
The Olight Seeker Ultra is rated brighter: 4,800 lm maximum vs 4,720 lm for the ThruNite TC20 V3, 2% more.
Which is cheaper, the Olight Seeker Ultra or the ThruNite TC20 V3?
When we checked on Nov 4, 2026, the Olight Seeker Ultra was $169.99 at olight.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $90.04 less. Prices change often, so check the current price before you buy.
Do the Olight Seeker Ultra and ThruNite TC20 V3 use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Olight Seeker Ultra with similar lights
Compare ThruNite TC20 V3 with similar lights
More
Sources
- Olight Seeker Ultra: specs from Olight product page (manufacturer). Drawing: outline from published specs. Price $169.99 from olight.com, checked Nov 4, 2026; prices change often.
- ThruNite TC20 V3: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $79.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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