Delipow 5000mAh 3.6V 21700 Flat Top Li-ion Battery – 15A Continuous High Capacity for LED Flashlights, Fans, Cameras & Toys

The Endurance Specialist with a 15A Kick
The Delipow 5000mAh 21700 flat‑top cell bridges the gap between pure energy storage and high‑current delivery. It offers a genuine 5000mAh capacity (approximately 18.5 watt‑hours) alongside a solid 15A continuous discharge, giving you the freedom to run high‑power LED flashlights on turbo, keep portable fans spinning through a work shift, power camera monitors on long shoots, or energize motorized toys for hours. This cell refuses to force you into the old compromise of choosing between runtime and power.

Flat‑Top and Unprotected — The Enthusiast’s Choice
Delipow intentionally supplies this cell without an external protection PCB and with a completely flush positive terminal. The flat‑top design keeps the overall length at the industry‑standard 70.0mm, ensuring a perfect fit in the precisely machined tubes of enthusiast flashlights, the recessed bays of high‑output portable fans, and the compact battery sleds of custom electronics. Omitting the protection PCB reduces internal resistance by eliminating an extra layer of circuitry, which means more of the cell’s energy reaches your device — critical for maintaining voltage under the 10–15A loads drawn by turbo flashlights and motorized toys. Naturally, this design requires you to use a quality charger that terminates at exactly 4.2V and to install the cell only in devices that have built‑in low‑voltage cutoff. Almost every modern LED flashlight, USB‑rechargeable fan, camera accessory, and electronic toy already incorporates this essential safety feature.

Where 5000mAh and 15A Shine Together
In a single‑LED or multi‑emitter flashlight, the 15A continuous output easily feeds turbo modes up to 4000 lumens without premature step‑down, while the 5000mAh capacity provides over 5 hours of 300‑lumen medium light or a full night on low. A USB desk fan running on low speed will hum for 10–12 hours, and even on high speed, the stable voltage keeps airflow strong. For camera monitors and video lights drawing a steady 1–3A, this cell reduces the need for mid‑shoot battery swaps, letting you focus on the creative work. Motorized toys and ride‑on vehicles also see dramatic runtime improvements compared to standard 2000–3000mAh packs. And for DIY enthusiasts, the flat‑top terminal is ready for spot welding into 2S or 3S packs for power banks, portable speakers, or backup power stations.

Long‑Life NMC Chemistry and Safety
The cell’s Nickel‑Manganese‑Cobalt (NMC) formulation delivers a stable 3.6V nominal voltage and a flat discharge curve, ensuring your flashlight beam doesn’t fade and your fan speed doesn’t droop until the battery is nearly empty. With an internal resistance of ≤25mΩ, voltage sag at 15A is a minimal 0.375V. The cell is rated for over 500 full charge/discharge cycles with at least 70% capacity retention, and its low self‑discharge rate allows storage for months at 3.6–3.7V. Built‑in passive safety features — a PTC thermistor, a resealable safety vent, and a CID (Current Interrupt Device) — provide multiple layers of protection against over‑current, over‑pressure, and short circuits.

Key Features

• 5000mAh High Capacity + 15A Continuous Discharge
  Delivers extended runtime and strong current capability. Provides 5+ hours of flashlight medium light, 10–12 hours of fan operation, or weeks of standby for sensors — all while powering devices that demand up to 15A.

• Unprotected Flat‑Top Design
  Standard 70mm length fits all 21700‑compatible devices. The flush positive terminal is essential for tight battery tubes, pogo‑pin contacts, and spot‑welded packs. Eliminates added resistance for cooler, more efficient power delivery.

• Stable NMC Chemistry
  Maintains a consistent 3.6V nominal voltage from 4.2V down to 2.5V with a flat discharge curve. Your light output and motor speeds stay predictable throughout the entire cycle.

• Low Internal Resistance (≤25mΩ)
  Voltage drop at 15A is only ~0.375V. Minimal energy is wasted as heat, and your devices stay in regulation longer.

• 500+ Cycle Life & Low Self‑Discharge
  Recharge over 500 times with minimal capacity fade. Holds a charge for months when stored at ~3.6–3.7V — always ready for the next adventure.

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

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

Technical Parameters

Applications

1. LED Flashlights & EDC Torches
   For turbo‑capable lights that need both extreme runtime and the ability to hold voltage on high modes. The flat‑top terminal is the standard for most enthusiast flashlight tubes.

2. Portable Fans for All‑Day Cooling
   USB desk fans, camping fans, and job‑site fans run 10–12 hours on low speed with this cell. The flat top fits perfectly into recessed fan battery bays.

3. Camera Monitors, Video Lights & Accessories
   External field monitors, LED panels, and camera battery adapters benefit from the massive capacity and stable 15A output. Fewer battery swaps mean uninterrupted shooting.

4. Motorized Toys & Ride‑On Vehicles
   Upgrade RC cars, robots, and children’s ride‑on toys with a 2S or 3S pack built from these cells. The 5000mAh capacity dramatically extends playtime.

5. DIY Power Banks & Hobby Electronics
   The flat‑top cell is ready for spot welding into custom 2S or 3S packs for high‑capacity USB‑C chargers, Bluetooth speakers, and portable power stations.

6. Surveillance & Smart Home Devices
   Wireless cameras, doorbells, and motion sensors can run for months on a single charge. Low self‑discharge ensures reliability during long idle periods.

FAQ

Q1: Is the 15A rating continuous or pulse?
A: The cell is rated for 15A continuous discharge. It can also pulse higher (up to 25A) for short bursts. We state the honest continuous rating so you know exactly what to expect during sustained use.

Q2: Why is this battery unprotected and only available as a flat top?
A: Delipow designed this cell for high‑capacity applications where a protection PCB would add unwanted length and resistance, and where a button top would prevent installation in tight compartments or interfere with spot welding. The flat top is the universal standard for enthusiast flashlights, fan bays, and custom packs. It’s safe when used with a quality 4.2V charger and in devices with built‑in low‑voltage cutoff. The cell’s PTC, vent, and CID provide passive protection.

Q3: Will this flat‑top cell work in a device that came with a button‑top battery?
A: It depends on the device. Many high‑performance flashlights and electronic devices are designed specifically for flat‑top cells. If your device has a spring‑loaded positive contact and a physical reverse‑polarity ring, it may require a button top to make contact. Check your device manual: if it specifies “flat top” or “unprotected flat top,” this cell is the correct choice.

Q4: Can I use this 21700 battery in a device designed for 18650?
A: No. A 21700 cell (21mm × 70mm) is physically larger than an 18650 (18mm × 65mm). Your device must explicitly support the 21700 form factor. Never force a 21700 into an 18650 tube.

Q5: How long will this battery run my portable fan?
A: On low speed (drawing about 0.4–0.5A), approximately 10–12 hours. On high speed (about 1.5–2A), around 3–4 hours. The 5000mAh capacity is nearly 2.5 times a standard 2000mAh 18650, providing a dramatic runtime improvement.

Q6: How should I store spare cells?
A: Keep them in a plastic battery case away from metal 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 fully depleted.

Q7: Can I bring this battery on an airplane?
A: Yes. At approximately 18.5Wh, it’s well under the 100Wh IATA limit for carry‑on luggage. Insulate the terminals and carry it in your hand luggage.