Emisar D4K vs Olight Baton Ultra size comparison
The Olight Baton Ultra is 10 mm (0.39 in) longer than the Emisar D4K, and 5 mm narrower at its widest point. Weights are published on different bases (with battery vs without battery), so compare them with care.
The Olight Baton Ultra is 10 mm (0.39 in) longer than the Emisar D4K, and 5 mm narrower at its widest point. Weights are published on different bases (with battery vs without battery), so compare them with care.
Dimensions
| Emisar D4K Check price ↗ | Olight Baton Ultra Check price ↗ | |
| Length | 103 mm (4.06 in) | 113 mm (4.45 in)+10 mm |
| Head / width | 28 mm (1.10 in) | 23 mm (0.91 in)−5 mm |
| Body | 26.5 mm (1.04 in) | 23 mm (0.91 in)−3.5 mm |
| Weight | 58 g without battery | 115 g with battery |
| Battery | 21700 | 18650 |
| Max output | — | 1,800 lm |
| Throw | — | 300 m |
| Type | EDC | EDC |
| Price | $39.69 at intl-outdoor.com, as of Nov 4, 2026 | not verified yet |
| Source | intl-outdoor.com sourced Output depends on LED option | batteryjunction.com sourced |
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D4K vs Baton Ultra: how they differ
Size and weight
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 113 mm (4.45 in), a difference of 10 mm (9%). At its widest point the Olight Baton Ultra is 5 mm slimmer (23 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Olight Baton Ultra: 115 g with battery), so they are not directly comparable.
Brightness and throw
The Olight Baton Ultra is rated at 1,800 lm; we have no published maximum for the Emisar D4K. Output for the Emisar D4K depends on the LED option chosen.
Battery
The Emisar D4K runs on a removable 21700 battery; the Olight Baton Ultra runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Type
Both are EDC lights in our catalog with a tube body.
Which should you buy?
Choose the Emisar D4K if you want a shorter light (10 mm shorter). Choose the Olight Baton Ultra if you want a slimmer profile (5 mm narrower). We compare published size, weight, output, throw and battery only, not runtime, interface or build quality.
Check price ↗ Emisar D4K Check price ↗ Olight Baton Ultra
We may earn a commission from these links, at no cost to you. Rankings are never paid for. Disclosure
D4K vs Baton Ultra FAQ
Which is smaller, the Emisar D4K or the Olight Baton Ultra?
The Emisar D4K is the shorter light: 103 mm (4.06 in) against 113 mm (4.45 in), a difference of 10 mm (9%). At its widest point the Olight Baton Ultra is 5 mm slimmer (23 vs 28 mm). Weights are published on different bases (Emisar D4K: 58 g without battery; Olight Baton Ultra: 115 g with battery), so they are not directly comparable.
Do the Emisar D4K and Olight Baton Ultra use the same battery?
The Emisar D4K runs on a removable 21700 battery; the Olight Baton Ultra runs on a removable 18650 battery. For scale, a 21700 cell is about 21 × 70 mm and a 18650 about 18 × 65 mm (nominal).
Compare Emisar D4K with similar lights
Compare Olight Baton Ultra with similar lights
More
Sources
- Emisar D4K: specs from Emisar product page (manufacturer). Price $39.69 from intl-outdoor.com, checked Nov 4, 2026; prices change often.
- Olight Baton Ultra: specs from Olight product page (manufacturer); manufacturer published specs as listed by batteryjunction.com. No verified price yet.
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