Fenix E40R vs ThruNite TC20 V3 size comparison
The ThruNite TC20 V3 is 13 mm (0.51 in) shorter than the Fenix E40R, 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 Fenix E40R, with about the same max diameter/width. It is 23 g lighter (with battery).
Dimensions
| Fenix E40R 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 | 26.4 mm (1.04 in) | 28 mm (1.10 in)+1.6 mm |
| Weight | 220 g with battery | 197 g with battery−23 g |
| Battery | 21700 | 21700 |
| Max output | 5,000 lm | 4,720 lm |
| Throw | 242 m | — |
| Type | EDC | EDC |
| Price | $109.95 at fenixlighting.com, as of Nov 4, 2026 | $79.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced Listed 35 mm wide x 26.4 mm high | batteryjunction.com sourced |
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E40R 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 Fenix E40R is rated brighter: 5,000 lm maximum vs 4,720 lm for the ThruNite TC20 V3, 6% 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 Fenix E40R was $109.95 at fenixlighting.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $30.00 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 Fenix E40R 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 ↗ Fenix E40R Check price ↗ ThruNite TC20 V3
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
E40R vs TC20 V3 FAQ
Which is smaller, the Fenix E40R 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 Fenix E40R or the ThruNite TC20 V3?
The Fenix E40R is rated brighter: 5,000 lm maximum vs 4,720 lm for the ThruNite TC20 V3, 6% more.
Which is cheaper, the Fenix E40R or the ThruNite TC20 V3?
When we checked on Nov 4, 2026, the Fenix E40R was $109.95 at fenixlighting.com and the ThruNite TC20 V3 $79.95 at batteryjunction.com, so the ThruNite TC20 V3 cost $30.00 less. Prices change often, so check the current price before you buy.
Do the Fenix E40R and ThruNite TC20 V3 use the same battery?
Both run on a removable 21700 battery, so spare cells work in either light.
Compare Fenix E40R with similar lights
Compare ThruNite TC20 V3 with similar lights
More
Sources
- Fenix E40R: specs from Fenix product page (manufacturer). Price $109.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- ThruNite TC20 V3: specs from manufacturer published specs as listed by batteryjunction.com. Price $79.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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