DMEGC INR21700-50E 5000mAh 3.7V 21700 Rechargeable Li-ion Battery – 10A Continuous for LED Flashlights, Fans, Cameras & Toys

Genuine 5000mAh with a Dependable 10A Output
The DMEGC INR21700-50E is a high‑capacity 21700 cell engineered for users who demand maximum runtime from their devices without sacrificing stable voltage. With a genuine 5000mAh capacity and a verified 10A continuous discharge, it delivers the endurance needed for all‑day fan cooling, all‑night flashlight beams, extended camera shoots, and marathon toy play sessions. The 10A output ensures that even on high settings, your devices receive steady current — no premature dimming, no sudden speed drops, just reliable, long‑lasting performance. Available in three terminal options, the 50E fits seamlessly into spring‑loaded compartments, ultra‑tight battery tubes, and custom‑welded DIY packs.

Unprotected, High‑Efficiency Design
Like most 21700 cells, the 50E is supplied as an unprotected bare cell. By omitting the external protection PCB, we keep the cell’s length at the standard 70mm (flat top) and reduce internal resistance. This means the cell fits effortlessly into any 21700‑compatible device, from enthusiast flashlights to portable fans and camera adapters. The lower resistance also allows more of the cell’s energy to reach your device and less to be dissipated as heat — a critical advantage when running at 10A for extended periods. In return, you simply pair the cell with a quality charger that stops at exactly 4.2V and install it only in devices that have built‑in low‑voltage cutoff. Almost every modern LED light, USB‑rechargeable fan, camera accessory, and electronic toy already incorporates this protection.

Three Terminal Choices — One Perfect Fit
Because no single terminal style fits every gadget, we offer three distinct options:

• Button Top: A raised positive nipple (~1.5mm) that locks securely into spring‑loaded battery compartments and passes mechanical reverse‑polarity guards. Ideal for many consumer flashlights, fan holders, and toy battery trays.

• Flat Top: A completely flush positive terminal. This is mandatory for ultra‑tight flashlight tubes, devices with pogo‑pin contacts, and custom spot‑welded battery packs. Many high‑end lights (ZebraLight, Noctigon, etc.) and camera accessories specifically require flat‑top cells.

• Nickel Tab: Both positive and negative ends come pre‑welded with pure nickel strips, ready for soldering or additional spot welding. The turn‑key solution for building high‑capacity power banks, 2S/3S packs for toys, or replacement cells for cordless tool batteries.

Where 5000mAh and 10A Make the Difference
The 50E’s 5000mAh capacity stores approximately 18.5 watt‑hours of energy — nearly 2.5 times what a standard 2000mAh 18650 can hold. In a single‑LED flashlight on a 300‑lumen medium mode, expect over 5 hours of continuous light; on a 50‑lumen low mode, the cell illuminates an entire night — 12 hours or more. A USB desk fan on low speed spins for 10–12 hours, keeping your workspace or tent comfortable through a full shift. For camera monitors and LED video lights, the 10A discharge easily powers the steady 1–3A draw while the high capacity reduces the need for mid‑shoot battery swaps. Motorized toys and ride‑on vehicles also benefit: a 2S or 3S pack built from 50E cells provides dramatically extended playtime and consistent power.

Advanced INR Chemistry for Long‑Term Reliability
Under the nickel‑plated steel shell, DMEGC’s INR (Nickel‑Manganese‑Cobalt) chemistry delivers a stable 3.7V nominal voltage and a flat discharge curve, ensuring your devices perform consistently from fresh off the charger to nearly empty. With an internal resistance of ≤30mΩ, voltage sag at 10A is only about 0.3V — keeping your flashlight beam bright and your fan speed steady. The cell is rated for over 500 full charge/discharge cycles with ≥70% capacity retention, and its low self‑discharge rate means you can store a spare at 3.6–3.7V for months without significant power loss. Built‑in PTC thermistor, resealable safety vent, and CID provide multiple layers of passive protection against over‑current, over‑pressure, and short circuits.

Key Features

• Genuine 5000mAh High Capacity (18.5Wh)
  Up to 2.5 times more energy than a standard 2000mAh 18650. Provides 5+ hours of flashlight medium mode, 10–12 hours of fan cooling, or weeks of standby for smart devices.

• Verified 10A Continuous Discharge
  Delivers stable 10A output without voltage sag. Handles the needs of medium‑drain devices — flashlights, fans, cameras, and toys — with ease. Can pulse up to 15A for short bursts.

• Unprotected, Standard 70mm Form Factor
  Fits all 21700‑compatible devices. Lower internal resistance ensures cooler operation and more efficient power delivery. Requires a quality 4.2V Li‑ion charger and device with low‑voltage cutoff.

• 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. Complete compatibility across the 21700 ecosystem.

• Stable INR (NMC) Chemistry
  DMEGC’s proven Nickel‑Manganese‑Cobalt formulation offers high energy density, excellent cycle stability, and reliable thermal performance.

• Low Internal Resistance (≤30mΩ)
  Voltage drop at 10A is only ~0.3V, keeping your devices in regulation longer and your beams brighter throughout the discharge cycle.

• 500+ Cycle Life & Low Self‑Discharge
  Recharge hundreds of times with minimal capacity fade. Holds its charge for months when stored at 3.6–3.7V — always ready for your next adventure or power outage.

• Multi‑Layered Passive Safety
  Built‑in PTC thermistor, resealable safety vent, and CID protect against over‑current, over‑pressure, and internal short circuits.

• Rugged Nickel‑Plated Steel Can
  Corrosion‑resistant and drop‑resistant. Engineered to withstand the bumps, vibrations, and daily wear of portable fans, toys, cameras, and outdoor use.

Technical Parameters

Applications

1. LED Flashlights & EDC Torches
Pop this 5000mAh cell into any 21700‑compatible flashlight and enjoy runtime that lasts from dusk to dawn. On medium mode, it delivers 5+ hours of steady light; on low, it runs all night. The 10A discharge easily handles turbo modes without triggering premature step‑down. Flat top fits ultra‑tight enthusiast tubes; button top locks securely in spring‑loaded hosts.

2. Portable Fans for All‑Day Cooling
USB desk fans, camping fans, and job‑site fans run effortlessly on this cell. Low speed gives 10–12 hours of gentle breeze; high speed stays strong thanks to the stable 10A output. The flat top is often required for recessed fan battery bays.

3. Camera Monitors, Video Lights & Accessories
External field monitors, LED panels, and camera battery adapters that accept 21700 cells benefit from the massive 5000mAh capacity. Fewer battery swaps mean uninterrupted shooting. Many camera adapters require flat‑top cells.

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 current needed for startup surges and sustained driving.

5. DIY Battery Packs & Power Banks
The nickel tab variant is ready for spot welding into custom 2S, 3S, or 4S configurations. Build a high‑capacity USB‑C power bank, a portable Bluetooth speaker battery, or a backup power station. 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. The 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 rely on 21700 power appreciate the combination of long runtime and stable 10A output, ensuring reliable operation through extended shifts.

FAQ

Q1: Is the DMEGC INR21700-50E really 5000mAh?
A: Yes. This cell uses high‑density INR electrodes to deliver a genuine 5000mAh. DMEGC is a major cell manufacturer, and the 50E series is widely used in power banks, e‑bikes, and other high‑capacity applications. You can verify the capacity with any analyzing charger.

Q2: Can this cell deliver 15A? I see "3C" on some listings.
A: The cell is rated for 10A continuous discharge. The “3C” figure (15A) often quoted is the maximum pulse discharge — suitable only for very short bursts of a few seconds. We state the honest continuous rating so you can trust what you’re buying. For applications needing 15A+ continuously, we recommend high‑drain cells like the EVE 40P or Samsung 40T.

Q3: Why is this battery unprotected? Is it safe for my flashlight?
A: Removing the protection PCB keeps the cell at the standard 70mm length and reduces internal resistance, which is essential for efficient 10A operation. It’s completely safe when used correctly: charge only with a dedicated 4.2V Li‑ion charger, and install only in devices with built‑in low‑voltage cutoff — a standard feature in modern flashlights, USB fans, cameras, and toys. The cell includes PTC, vent, and CID for passive protection.

Q4: Which terminal should I choose — Button Top, Flat Top, or Nickel Tab?
A: Button Top for devices with spring‑loaded positive contacts and reverse‑polarity rings. Flat Top for tight tubes and pogo‑pin/flat PCB contacts (common in enthusiast flashlights and many camera adapters). Nickel Tab if you’re building a spot‑welded battery pack. Check your device manual or measure the battery compartment if unsure.

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). Your device must explicitly support the 21700 form factor. Never force a 21700 into an 18650 tube.

Q6: How does the DMEGC 50E compare to the Samsung 50E or EVE 50E?
A: All three are in the same class: 5000mAh capacity, 10A continuous discharge. Performance is very similar. DMEGC cells are widely used in OEM applications and offer excellent value. You can expect comparable runtime and cycle life across these brands.

Q7: How long does it take to charge?
A: At the standard charge rate of 2.5A, a fully depleted cell takes about 2.5 hours. Using a 1A charger will take approximately 5.5 hours. Always use a smart Li‑ion charger with accurate 4.2V termination.

Q8: How should I store this cell when not in use?
A: Store 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 below 3.0V. Never store a fully depleted cell.

Q9: 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 with tape or a plastic case and carry it in your hand luggage.