Fenix TK21R vs Nitecore P23i size comparison
The Nitecore P23i is 15.5 mm (0.61 in) shorter than the Fenix TK21R, and 5 mm narrower at its widest point.
The Nitecore P23i is 15.5 mm (0.61 in) shorter than the Fenix TK21R, and 5 mm narrower at its widest point.
Dimensions
| Fenix TK21R Check price ↗ | Nitecore P23i Check price ↗ | |
| Length | 159.5 mm (6.28 in) | 144 mm (5.67 in)−15.5 mm |
| Head / width | 36 mm (1.42 in) | 31 mm (1.22 in)−5 mm |
| Body | 25.4 mm (1.00 in) | 25 mm (0.98 in)−0.4 mm |
| Weight | 221.4 g with battery | — |
| Battery | One included 6000mAh rechargeable li-ion | 21700 |
| Max output | 3,600 lm | 3,000 lm |
| Throw | 480 m | 470 m |
| Type | Tactical | Tactical |
| Price | $134.95 at fenixlighting.com, as of Nov 4, 2026 | $99.95 at batteryjunction.com, as of Nov 4, 2026 |
| Source | fenixlighting.com sourced | batteryjunction.com sourced Retailer weight (297 g) looks inconsistent with this size; omitted until confirmed |
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TK21R vs P23i: how they differ
Size and weight
The Nitecore P23i is the shorter light: 144 mm (5.67 in) against 159.5 mm (6.28 in), a difference of 15.5 mm (10%). At its widest point the Nitecore P23i is 5 mm slimmer (31 vs 36 mm).
Brightness and throw
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 3,000 lm for the Nitecore P23i, 20% more. For beam distance the Fenix TK21R reaches further: 480 m vs 470 m rated throw (2% more).
Battery
The Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion); the Nitecore P23i runs on a removable 21700 battery.
Price
When we checked on Nov 4, 2026, the Fenix TK21R was $134.95 at fenixlighting.com and the Nitecore P23i $99.95 at batteryjunction.com, so the Nitecore P23i cost $35.00 less. 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 TK21R if you want more output (3,600 lm vs 3,000 lm). Choose the Nitecore P23i if you want a shorter light (15.5 mm shorter) and a slimmer profile (5 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Fenix TK21R Check price ↗ Nitecore P23i
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TK21R vs P23i FAQ
Which is smaller, the Fenix TK21R or the Nitecore P23i?
The Nitecore P23i is the shorter light: 144 mm (5.67 in) against 159.5 mm (6.28 in), a difference of 15.5 mm (10%). At its widest point the Nitecore P23i is 5 mm slimmer (31 vs 36 mm).
Which is brighter, the Fenix TK21R or the Nitecore P23i?
The Fenix TK21R is rated brighter: 3,600 lm maximum vs 3,000 lm for the Nitecore P23i, 20% more. For beam distance the Fenix TK21R reaches further: 480 m vs 470 m rated throw (2% more).
Which is cheaper, the Fenix TK21R or the Nitecore P23i?
When we checked on Nov 4, 2026, the Fenix TK21R was $134.95 at fenixlighting.com and the Nitecore P23i $99.95 at batteryjunction.com, so the Nitecore P23i cost $35.00 less. Prices change often, so check the current price before you buy.
Do the Fenix TK21R and Nitecore P23i use the same battery?
The Fenix TK21R runs on its own battery (One included 6000mAh rechargeable li-ion); the Nitecore P23i runs on a removable 21700 battery.
Compare Fenix TK21R with similar lights
Compare Nitecore P23i with similar lights
More
Sources
- Fenix TK21R: specs from Fenix product page (manufacturer). Drawing: shape measured from manufacturer photo (nealsgadgets.com), scaled to the published length and diameter. Price $134.95 from fenixlighting.com, checked Nov 4, 2026; prices change often.
- Nitecore P23i: specs from manufacturer published specs as listed by batteryjunction.com. Drawing: shape measured from manufacturer photo (batteryjunction.com), scaled to the published length and diameter. Price $99.95 from batteryjunction.com, checked Nov 4, 2026; prices change often.
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