Tested & Certified
SCIGOLD 18650 Li-ion Cells — Cold-Weather Advanced
Premium 18650 lithium-ion cells engineered for sub-freezing environments. 3,500 / 4,000 mAh capacities, internal resistance ≤15mΩ (33% lower than Standard), operates down to -40°C. For winter EDC, hunting, outdoor security cameras, and arctic-grade flashlights.
- Cell size
- 18650
- Power
- 3.6V Li-ion
- Material
- Protected button-top, low-temperature electrolyte
- SKU range
- SL1865035LTHP / SL1865040LT — 2 capacities × 2 packs = 4 SKUs
Specs at a Glance
Everything in the spec sheet.
- 2 high-capacity options: 3,500 / 4,000 mAh (11,690 ~ 13,360 mWh)
- Operating temperature: -40°C ~ 55°C (Standard series stops at -20°C)
- Internal resistance ≤15mΩ — 33% lower than Standard for high-drain performance
- Up to 21A peak discharge (3500mAh) / 12A continuous (4000mAh)
- Low-temperature electrolyte formulation — minimal capacity loss in cold
- Same protected button-top safety circuit (overcharge / short / temperature)
- Charge cut-off 4.25V, discharge cut-off 2.3V
- 500+ cycles to 80% capacity retention
- Dimensions: 18.6 × 65.3 mm · 46±1g per cell
When the Standard cells stop in the cold, these still go.
Lithium-ion cells lose capacity below freezing. Standard cells stop dead at -20°C. The Advanced/Cold-Weather variant uses a modified electrolyte formulation that keeps charge transport efficient down to -40°C — and a lower-internal-resistance cell construction (≤15mΩ vs ≤22mΩ Standard) that delivers higher continuous current with less voltage sag.
Pick your capacity
| Capacity | Energy | Peak Discharge | Best for |
|---|---|---|---|
| 3,500 mAh (11,690 mWh) | 21A peak | Tactical EDC flashlights, high-drain headlamps, sub-zero search-and-rescue | |
| 4,000 mAh (13,360 mWh) | 12A continuous | Long-runtime needs, outdoor security cameras, expedition gear |
The 3,500 mAh is the high-drain champion (21A peak); the 4,000 mAh trades peak current for 14% more total energy.
Where this actually matters
Winter EDC flashlights. A standard 18650 at -10°C drops to ~70% capacity. Cold-Weather holds ~90%. That’s the difference between your flashlight working at the trailhead vs being a dead weight.
Outdoor security cameras (Blink, Ring, Arlo). Standard 18650 packs lose 25% capacity at 0°C and 50% at -10°C. Cold-Weather cells lose ~10% at 0°C and ~20% at -10°C. Twice the winter runtime for cameras outside.
Sub-zero hunting / military / arctic field gear. When the failure mode is “device won’t turn on at -30°C,” the Standard series is unfit for purpose. The Cold-Weather series was built for these conditions.
What this isn’t
If you’re indoors all year and your 18650 lives in a vape mod or a desk-side flashlight, the Standard series is the right choice — same capacity range at half the price. The Cold-Weather premium is for users who actually operate in cold.
Specifications
| 3,500 mAh | 4,000 mAh | |
|---|---|---|
| Energy | 11,690 mWh | 13,360 mWh |
| Nominal voltage | 3.6V | 3.6V |
| Internal resistance | ≤15mΩ | ≤20mΩ |
| Standard current | 21A peak | 12A continuous |
| Operating temperature | -40°C ~ 55°C | -40°C ~ 55°C |
| Cycle life (80% retention) | 500+ | 500+ |
| Dimensions | 18.6 × 65.3 mm | 18.6 × 65.3 mm |
| Weight | 46±1g | 47±1g |
Frequently Asked
Quick answers, before you buy.
What makes the Cold-Weather 18650 different from the Standard version?
How cold can these 18650 cells actually operate?
What capacities does the Cold-Weather 18650 come in?
How much current can these cells deliver?
Are the Cold-Weather 18650 cells protected?
Should I buy Cold-Weather or Standard 18650 cells?
From the Lab
