Product Description
Genuine 5000mAh with Reliable 10A Output
The Lishen LR2170SD is a high‑capacity 21700 cell that combines a generous 5000mAh energy reserve with a steady 10A continuous discharge capability. It’s built for users who need their devices to run longer without sacrificing voltage stability. Whether you’re powering an LED flashlight on a night hike, a portable fan through a long work shift, a camera monitor on location, or a child’s motorized toy, this cell delivers the endurance you demand. The flat‑top design keeps the overall length at 70mm, and we also offer button‑top and nickel‑tab variants so you can match the exact terminal your device requires.
Unprotected, High‑Performance Design
Like most 21700 cells, the LR2170SD comes as an unprotected bare cell. Omitting the external protection PCB keeps the cell short, reduces internal resistance, and avoids the current‑limiting trip points that can choke protected cells during moderate 5–10A loads. In return, you must use a quality charger that stops at 4.2V and only install the cell in devices that have built‑in low‑voltage cutoff — a standard feature in virtually all modern LED flashlights, USB‑rechargeable fans, camera adapters, and electronic toys. The cell itself incorporates a PTC thermistor, resealable safety vent, and CID (Current Interrupt Device) for passive protection against over‑current, over‑pressure, and short circuits.
Three Terminal Options — One Perfect Fit
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Button Top: A raised positive nipple (~1.5mm) that locks into spring‑loaded contacts and passes mechanical reverse‑polarity guards. Ideal for many consumer flashlights, some fan trays, and toy battery compartments.
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Flat Top: A completely flush positive terminal, required for ultra‑tight battery tubes, pogo‑pin contacts, and custom spot‑welded packs. Many high‑end flashlights (ZebraLight, Noctigon, etc.) and camera accessories require flat‑top cells.
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Nickel Tab: Both terminals come pre‑welded with pure nickel strips, ready for soldering or additional spot welding. Perfect for building DIY battery packs, power banks, or replacing cells in cordless tool packs.
Where 5000mAh Transforms Your Experience
At the heart of the LR2170SD is Lishen's mature NCM chemistry, which delivers a stable 3.7V nominal voltage and a flat discharge curve. In a single‑LED flashlight on a 300‑lumen medium mode, you can expect over 5 hours of continuous light; on a 50‑lumen low mode, the cell can illuminate an entire night — 12 hours or more. A USB desk fan on low speed runs for 10–12 hours, and even on high speed the voltage holds steady, so airflow doesn't weaken prematurely. For camera monitors and video lights, the 10A discharge easily handles the 1–3A draw while the 5000mAh capacity keeps you shooting longer between battery swaps. Motorized toys and ride‑on vehicles also benefit from the extended runtime and consistent power delivery.
Built for Long‑Term Reliability
The LR2170SD is rated for more than 500 full charge/discharge cycles with ≥70% capacity retention. Its low self‑discharge rate means you can store a spare at 3.6–3.7V for months, and it will still wake up with most of its charge intact. The nickel‑plated steel can resists corrosion, drops, and the bumps of daily use. With its verified 10A continuous rating, this cell provides honest power without marketing exaggeration — exactly what you need for your medium‑drain devices.
Key Features
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Genuine 5000mAh High Capacity
Store more energy and run your devices longer. Provides over 5 hours of flashlight medium‑mode light, 10‑12 hours of fan operation, or weeks of standby for smart devices.
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Verified 10A Continuous Discharge
Delivers a steady 10A without voltage sag. Handles the medium‑drain needs of flashlights, fans, cameras, and toys with ease. Can pulse up to 15A for short bursts.
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Unprotected Bare Cell
Standard 70mm length (flat top) fits all 21700‑compatible devices. Lower internal resistance ensures efficient energy transfer and cooler operation. Requires a 4.2V Li‑ion charger and device with low‑voltage cutoff.
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Three Terminal Options: Button Top, Flat Top & Nickel Tab
Button Top for spring‑contact hosts. Flat Top for tight tubes and pogo‑pin devices. Nickel Tab for ready‑to‑weld custom battery packs. Full compatibility across the 21700 ecosystem.
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Stable NCM Chemistry
Lishen's proven Nickel Cobalt Manganese formulation offers high energy density, excellent cycle stability, and reliable thermal performance.
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Low Internal Resistance (≤30mΩ)
Voltage drop at 10A is only about 0.3V, keeping your devices in regulation and your beams bright longer.
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500+ Cycle Life & Low Self‑Discharge
Recharge over 500 times with minimal capacity loss. Holds its charge for months in storage — always ready when you need it.
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Multi‑Layered Passive Safety
Built‑in PTC thermistor, resealable safety vent, and CID protect against over‑current, over‑pressure, and internal short circuits.
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Rugged Nickel‑Plated Steel Can
Corrosion‑resistant and drop‑resistant. Engineered to withstand the rigors of portable fans, toys, cameras, and outdoor adventures.
Technical Parameters
Applications
1. LED Flashlights & EDC Torches
Pop this 5000mAh cell into your favorite 21700‑compatible flashlight. On medium mode, it provides 5+ hours of steady beam; on low, it lasts all night. The 10A discharge easily handles turbo modes without premature step‑down. Flat top fits ultra‑tight enthusiast tubes; button top locks into spring‑loaded hosts.
2. Portable Fans for All‑Day Cooling
USB desk fans, camping fans, and job‑site fans run exceptionally well on this cell. Low speed delivers 10–12 hours of breeze, and the stable voltage means even high speed stays strong. The flat top is often required for recessed fan battery bays.
3. Camera Monitors & Video Lights
External field monitors, LED video panels, and camera battery adapters that accept 21700 cells benefit from the massive capacity. Fewer battery swaps mean uninterrupted shooting. Check your device for the required terminal type — many use flat top.
4. Motorized Toys & Ride‑On Vehicles
Upgrade your child’s RC car, robot, or ride‑on toy with a 2S or 3S pack built from these cells. The 5000mAh capacity dramatically extends playtime, and the 10A discharge provides the punch needed for startup surges.
5. DIY Battery Packs & Power Banks
The nickel tab variant is ready for spot welding into custom 2S, 3S, or 4S packs. Build a high‑capacity USB‑C power bank, a portable speaker battery, or a backup power station. The consistent 5000mAh per cell simplifies cell matching.
6. Surveillance & Smart Home Devices
Wireless outdoor cameras, trail cameras, and motion‑activated lights can run for weeks or months on a single charge. Low self‑discharge ensures the battery stays ready during long idle periods.
7. Portable Medical & Industrial Equipment
Handheld scanners, portable nebulizers, and thermal printers that use 21700 cells benefit from the combination of long runtime and stable 10A output.
FAQ
Q1: Is the Lishen LR2170SD really 5000mAh?
A: Yes, this cell uses high‑density NCM electrodes to deliver a genuine 5000mAh. You can verify with any analyzing charger. Lishen is a major manufacturer, and the LR2170SD is widely used in power banks, e‑bikes, and other high‑capacity applications.
Q2: Can this cell handle 10A continuously without overheating?
A: Absolutely. The 10A continuous rating is verified. With ≤30mΩ internal resistance, heat generation at 10A is moderate. The cell will become warm but stays well within safe operating limits, especially in devices that cycle on and off rather than drawing 10A non‑stop.
Q3: Why is this battery unprotected? Is it safe for my flashlight?
A: Removing the protection PCB keeps the cell short (70mm flat top) and reduces internal resistance, which is essential for efficient 10A operation. It's safe when used correctly: always charge with a quality 4.2V Li‑ion charger, and only install it in devices with built‑in low‑voltage cutoff (which almost all modern flashlights, fans, cameras, and toys have). The cell includes PTC, vent, and CID for passive safety.
Q4: Which terminal should I choose — Button Top, Flat Top, or Nickel Tab?
A: Button Top for devices with spring‑loaded positive contacts and a physical reverse‑polarity ring. Flat Top for tight tubes and pogo‑pin/flat PCB contacts (common in enthusiast flashlights and camera adapters). Nickel Tab if you're building a spot‑welded battery pack. When in doubt, measure your device's battery compartment or consult its manual.
Q5: Will this battery fit in a device designed for 18650?
A: No. A 21700 cell (21mm × 70mm) is both wider and longer than an 18650 (18mm × 65mm). The device must explicitly support the 21700 form factor. Do not force a 21700 into an 18650 tube.
Q6: How does this compare to a Samsung 50E or EVE 50E?
A: The Lishen LR2170SD is in the same class: 5000mAh capacity, 10A continuous discharge. Performance is very similar. Lishen cells are widely used in OEM applications and offer excellent value. You can expect comparable runtime and cycle life.
Q7: How should I store this cell when not in use?
A: Keep it in a plastic battery case or silicone sleeve, away from metal objects and moisture. For storage longer than one month, bring the voltage to about 3.6–3.7V (roughly 50% charge). Check every 3 months and recharge if it drops below 3.0V. Never store a fully depleted cell.
Q8: Can I bring this battery on an airplane?
A: Yes. At 18.5Wh, it's well under the 100Wh IATA limit for carry‑on luggage. Insulate the terminals and carry it in your hand luggage. Airlines typically allow multiple small Li‑ion cells for personal use.
Q9: What charger should I use?
A: Any quality charger designed for 3.7V Li‑ion cells with accurate 4.2V termination. Most modern chargers from brands like XTAR, Nitecore, and LiitoKala support 21700 cells. Check that your charger's bay can accommodate the 70mm length.
