Tested & Certified
SCIGOLD 18650 Li-ion Cells — Cold-Weather Advanced
18650 Li-ion cells for sub-freezing use: 3,500 / 4,000 mAh, low internal resistance, rated for use to -40°C. Confirm charging guidance with SCIGOLD.
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- Cell size
- 18650
- Power
- 3.34V Li-ion
- Material
- Protected button-top
- Cell models
- SL1865035LTHP / SL1865040LT
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on orders $35+
12-month warranty
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original condition & packaging
SCIGOLD 18650 Cold-Weather · 3.34V Li-ion
Winter use to -40°C. Made for winter.
3,500 or 4,000 mAh (up to 13,360 mWh), rated for use from -40°C to 55°C, and up to 21 A continuous. Confirm model-specific charging guidance with SCIGOLD.
Inside the Cold-Weather 18650
Built for the cold, and for high drain.
Rated to operate down to -40°C, with lower internal resistance than the Standard series and the same protected button-top.
-40°C use
Use to -40°C. The Standard stops at -20°C.
Ordinary Li-ion cells lose a large share of their capacity below freezing and can cut out entirely in deep cold. This cell is rated to operate down to -40°C, 20 degrees below the Standard series. Like any Li-ion cell, it still runs shorter in deep cold than at room temperature.
Below -20°C, it is the SCIGOLD cell rated for the job.
- Use range: -40°C to 55°C; not a charging range
- For winter EDC, hunting, outdoor security cameras and expedition gear
High drain
Up to 21 A continuous. 12 A on the 4,000 mAh cell.
Lower internal resistance than the Standard series means less voltage sag and less heat under heavy load. That is what high-output flashlights and headlamps ask for on their top modes, especially in the cold.
The 4,000 mAh cell holds 14% more energy than the 3,500 mAh cell.
- 3,500 mAh: 11,690 mWh, 21 A continuous, internal resistance 15 mΩ or less
- 4,000 mAh: 13,360 mWh, 12 A, internal resistance 20 mΩ or less
Charging
Charge on the Bench Dock.
The -40°C use rating does not define a charging temperature range. Do not use it as permission to charge in the cold. Contact SCIGOLD for your model's charging-temperature instructions before charging after cold-weather use.
The SCIGOLD Bench Dock (CW401) charges up to four 18650 or 21700 cells at once. Each bay detects its cell, applies the Li-ion charge profile, and shows live voltage and charging status on the LCD. Follow the cell and charger's instructions.
It runs from USB-C: a phone charger, a laptop adapter, a power bank or a car USB port.
Why this cell
When Standard cells stop in the cold, these still go.
Use to -40°C
Rated for use from -40°C to 55°C. This is not a charging temperature range. The Standard series stops at -20°C.
Up to 13,360 mWh
3,500 or 4,000 mAh at 3.34V nominal: 11,690 or 13,360 mWh a cell.
Up to 21 A continuous
21 A continuous on the 3,500 mAh cell and 12 A on the 4,000 mAh, with less voltage sag under heavy load.
Protected button-top
Guards against overcharge, over-discharge, short circuit and over-current. Certified to IEC 62133-2 and UN 38.3.
Compatibility
Made for gear that lives in the cold.
- Flashlights
- Winter EDC and tactical flashlights, and high-drain headlamps that take an 18650.
- Cameras
- Outdoor cameras that run on loose 18650 cells and sit outside all winter. Check the camera's manual for the cell it takes.
- Field gear
- Hunting optics, ski-patrol lights, search-and-rescue and expedition gear used below freezing.
- Charger
- The SCIGOLD Bench Dock, which charges up to four 18650 or 21700 cells at once.
Good to know
- The -40°C rating is for use. Contact SCIGOLD for model-specific charging-temperature guidance before charging after cold-weather use.
- Indoors or in a mild climate, the Standard 18650 (rated to -20°C) is the lower-cost choice.
- Protected button-tops sit slightly longer than flat-tops. Check your device has room before you order.
- Rated for 500+ charge cycles. 3.34V nominal; charge cut-off 4.25V, discharge cut-off 2.3V.
- 3,500 mAh: 18.6 × 65.3 mm, 46 g ± 1 g per cell. 4,000 mAh: standard 18650 size, 47 g ± 1 g per cell.
Specs & details
Every number, in one place.
When the Standard cells stop in the cold, these still go.
Lithium-ion cells lose capacity below freezing. Standard cells are rated only to -20°C. The Advanced/
Charging after cold-weather use: The -40°C to 55°C use rating is not a charging temperature range. Do not use it as permission to charge in the cold. Contact SCIGOLD for charging-temperature instructions for your exact model — SL1865035LTHP (3,500 mAh) or SL1865040LT (4,000 mAh) — before charging after cold-weather use. Follow the cell and compatible charger’s instructions.
Pick your capacity
| Capacity (energy) | Discharge | Best for |
|---|---|---|
| 3,500 mAh (11,690 mWh) | 21A continuous (6C) | Tactical EDC flashlights, high-drain headlamps, sub-zero search-and-rescue |
| 4,000 mAh (13,360 mWh) | 12A | Long-runtime needs, outdoor security cameras, expedition gear |
The 3,500 mAh is the high-drain choice (21A continuous); the 4,000 mAh trades discharge current for 14% more total energy (13,360 vs 11,690 mWh).
Where this actually matters
Winter EDC flashlights. Below freezing, an ordinary 18650 gives up a large share of its capacity, and past its -20°C rating it can cut out entirely. The Cold-Weather cell is rated to -40°C. That’s the difference between your flashlight working at the trailhead vs being a dead weight.
Outdoor security cameras. A camera that runs on 18650 cells and sits outside all winter spends its nights below freezing. The Standard series is rated to -20°C; the Cold-Weather series is rated to -40°C, 20 degrees further down. Check the camera maker’s battery requirements first.
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 — from about half the price per pack, in 2,000-2,500 mAh capacities instead of 3,500-4,000 mAh. The Cold-Weather premium is for users who actually operate in cold.
Its 21A rating doesn’t make it a pack-building cell. Pack building is normally done with unprotected flat-top cells and a BMS. SCIGOLD cells are protected button-tops and are not sold for building or rebuilding packs.
Specifications
| Spec | 3,500 mAh | 4,000 mAh |
|---|---|---|
| Energy | 11,690 mWh | 13,360 mWh |
| Nominal voltage | 3.34V | 3.34V |
| Charge cut-off voltage | 4.25V | 4.25V |
| Discharge cut-off voltage | 2.3V | 2.3V |
| Internal resistance | 15 mΩ max | 20 mΩ max |
| Standard discharge current (0.2C) | 0.7A | 0.8A |
| Max discharge current | 21A continuous (6C) | 12A |
| Use temperature (not charging) | -40°C ~ 55°C | -40°C ~ 55°C |
| Charging temperature | Confirm with SCIGOLD for this model | Confirm with SCIGOLD for this model |
| Cycle life | 500+ | 500+ |
| Dimensions | 18.6 × 65.3 mm | Standard 18650 |
| 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?
Can I charge these cells at -40°C?
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?
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