Fenix C7 vs Streamlight PolyTac X USB size comparison
The Streamlight PolyTac X USB is 10 mm (0.39 in) shorter than the Fenix C7, and 8 mm narrower at its widest point. Weights are published on different bases (listed vs without battery), so compare them with care.
The Streamlight PolyTac X USB is 10 mm (0.39 in) shorter than the Fenix C7, and 8 mm narrower at its widest point. Weights are published on different bases (listed vs without battery), so compare them with care.
Dimensions
| Fenix C7 Check price ↗ | Streamlight PolyTac X USB Check price ↗ | |
| Length | 149 mm (5.87 in) | 139 mm (5.47 in)−10 mm |
| Head / width | 40 mm (1.57 in) | 32 mm (1.26 in)−8 mm |
| Body | 27 mm (1.06 in) | 25 mm (0.98 in)−2 mm |
| Weight | 172 g without battery | 139 g listed |
| Battery | 21700 | 18650 / 2x CR123A |
| Max output | 3,000 lm | 600 lm |
| Throw | 470 m | 205 m |
| Type | Work light | Work light |
| Price | from $59.95 at fenixlighting.com, as of Nov 4, 2026 | $74.75 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced |
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C7 vs PolyTac X USB: how they differ
Size and weight
The Streamlight PolyTac X USB is the shorter light: 139 mm (5.47 in) against 149 mm (5.87 in), a difference of 10 mm (7%). At its widest point the Streamlight PolyTac X USB is 8 mm slimmer (32 vs 40 mm). Weights are published on different bases (Fenix C7: 172 g without battery; Streamlight PolyTac X USB: 139 g listed), so they are not directly comparable.
Brightness and throw
The Fenix C7 is rated brighter: 3,000 lm maximum vs 600 lm for the Streamlight PolyTac X USB, 400% more. For beam distance the Fenix C7 reaches further: 470 m vs 205 m rated throw (129% more).
Battery
The Fenix C7 runs on a removable 21700 battery; the Streamlight PolyTac X USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Price
When we checked on Nov 4, 2026, the Fenix C7 was from $59.95 at fenixlighting.com and the Streamlight PolyTac X USB $74.75 at batteryjunction.com, so the Fenix C7 cost $14.80 less. Prices change often, so check the current price before you buy.
Type
Both are work lights in our catalog with a tube body.
Which should you buy?
Choose the Fenix C7 if you want more output (3,000 lm vs 600 lm) and longer throw (470 m vs 205 m). Choose the Streamlight PolyTac X USB if you want a shorter light (10 mm shorter) and a slimmer profile (8 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix C7 Check price ↗ Streamlight PolyTac X USB
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C7 vs PolyTac X USB FAQ
Which is smaller, the Fenix C7 or the Streamlight PolyTac X USB?
The Streamlight PolyTac X USB is the shorter light: 139 mm (5.47 in) against 149 mm (5.87 in), a difference of 10 mm (7%). At its widest point the Streamlight PolyTac X USB is 8 mm slimmer (32 vs 40 mm). Weights are published on different bases (Fenix C7: 172 g without battery; Streamlight PolyTac X USB: 139 g listed), so they are not directly comparable.
Which is brighter, the Fenix C7 or the Streamlight PolyTac X USB?
The Fenix C7 is rated brighter: 3,000 lm maximum vs 600 lm for the Streamlight PolyTac X USB, 400% more. For beam distance the Fenix C7 reaches further: 470 m vs 205 m rated throw (129% more).
Which is cheaper, the Fenix C7 or the Streamlight PolyTac X USB?
When we checked on Nov 4, 2026, the Fenix C7 was from $59.95 at fenixlighting.com and the Streamlight PolyTac X USB $74.75 at batteryjunction.com, so the Fenix C7 cost $14.80 less. Prices change often, so check the current price before you buy.
Do the Fenix C7 and Streamlight PolyTac X USB use the same battery?
The Fenix C7 runs on a removable 21700 battery; the Streamlight PolyTac X USB runs on removable 18650 / 2x CR123A batteries. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Fenix C7 with similar lights
Compare Streamlight PolyTac X USB with similar lights
More
Sources
- Fenix C7: specs from Fenix product page (manufacturer). Drawing: shape measured from manufacturer photo (fenixlighting.com), scaled to the published length and diameter. Price from $59.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Streamlight PolyTac X USB: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: outline from published specs. Price $74.75 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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