Fenix TK17 vs Klarus XT21C size comparison
The Klarus XT21C is 1.5 mm (0.06 in) shorter than the Fenix TK17, and 1 mm narrower at its widest point. Weights are published on different bases (listed vs with battery), so compare them with care.
The Klarus XT21C is 1.5 mm (0.06 in) shorter than the Fenix TK17, and 1 mm narrower at its widest point. Weights are published on different bases (listed vs with battery), so compare them with care.
Dimensions
| Fenix TK17 Check price ↗ | Klarus XT21C Check price ↗ | |
| Length | 148.5 mm (5.85 in) | 147 mm (5.79 in)−1.5 mm |
| Head / width | 36 mm (1.42 in) | 35 mm (1.38 in)−1 mm |
| Body | 25.4 mm (1.00 in) | 25 mm (0.98 in)−0.4 mm |
| Weight | 197.2 g with battery | 110 g listed |
| Battery | One included 6000mAh rechargeable li-ion | 21700 |
| Max output | 3,600 lm | 3,000 lm |
| Throw | 330 m | 324 m |
| Type | Tactical | Tactical |
| Price | $104.95 at fenixlighting.com, as of Nov 4, 2026 | $104.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced |
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TK17 vs XT21C: how they differ
Size and weight
The Klarus XT21C is the shorter light: 147 mm (5.79 in) against 148.5 mm (5.85 in), a difference of 1.5 mm (1%). At its widest point the Klarus XT21C is 1 mm slimmer (35 vs 36 mm). Weights are published on different bases (Fenix TK17: 197.2 g with battery; Klarus XT21C: 110 g listed), so they are not directly comparable.
Brightness and throw
The Fenix TK17 is rated brighter: 3,600 lm maximum vs 3,000 lm for the Klarus XT21C, 20% more. For beam distance the Fenix TK17 reaches further: 330 m vs 324 m rated throw (2% more).
Battery
The Fenix TK17 runs on its own battery (One included 6000mAh rechargeable li-ion); the Klarus XT21C runs on a removable 21700 battery.
Price
When we checked on Nov 4, 2026, the Fenix TK17 was $104.95 at fenixlighting.com and the Klarus XT21C $104.95 at batteryjunction.com. Prices change often, so check the current price before you buy.
Type
Both are tactical lights in our catalog with a tube body.
Which should you buy?
Choose the Fenix TK17 if you want more output (3,600 lm vs 3,000 lm). On the specs we track, the Fenix TK17 is ahead or level everywhere; the Klarus XT21C 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 TK17 Check price ↗ Klarus XT21C
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TK17 vs XT21C FAQ
Which is smaller, the Fenix TK17 or the Klarus XT21C?
The Klarus XT21C is the shorter light: 147 mm (5.79 in) against 148.5 mm (5.85 in), a difference of 1.5 mm (1%). At its widest point the Klarus XT21C is 1 mm slimmer (35 vs 36 mm). Weights are published on different bases (Fenix TK17: 197.2 g with battery; Klarus XT21C: 110 g listed), so they are not directly comparable.
Which is brighter, the Fenix TK17 or the Klarus XT21C?
The Fenix TK17 is rated brighter: 3,600 lm maximum vs 3,000 lm for the Klarus XT21C, 20% more. For beam distance the Fenix TK17 reaches further: 330 m vs 324 m rated throw (2% more).
Which is cheaper, the Fenix TK17 or the Klarus XT21C?
When we checked on Nov 4, 2026, the Fenix TK17 was $104.95 at fenixlighting.com and the Klarus XT21C $104.95 at batteryjunction.com. Prices change often, so check the current price before you buy.
Do the Fenix TK17 and Klarus XT21C use the same battery?
The Fenix TK17 runs on its own battery (One included 6000mAh rechargeable li-ion); the Klarus XT21C runs on a removable 21700 battery.
Compare Fenix TK17 with similar lights
Compare Klarus XT21C with similar lights
More
Sources
- Fenix TK17: specs from Fenix product page (manufacturer). Price $104.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Klarus XT21C: specs from manufacturer published specs as listed by batteryjunction.com. Price $104.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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