3000mAh (11.1Wh) 3.7V 18650 Li-ion Rechargeable Battery (2-Pack) – High Capacity for LED Flashlights, Headlamps & Portable Fans

The Intelligent Balance of Power and Runtime

In the world of 18650 batteries, 3000mAh represents a remarkable sweet spot — substantial enough to power your devices through the longest nights, yet compact and lightweight enough to carry without a second thought. This 2‑pack delivers exactly that: two cells, each storing a genuine 11.1 watt‑hours of energy. Whether you’re feeding a high‑performance LED flashlight, a reliable headlamp, or a portable fan that hums through the workday, these batteries provide the endurance you need without the extra weight and cost of oversized 3500mAh giants.

Unprotected by Design — Shorter, Lighter, More Direct

We intentionally omit the external protection PCB from these cells. The reward is a battery that measures only 65.0mm (flat top) or 66.5mm (button top) — noticeably shorter than protected equivalents — allowing it to slide effortlessly into the tightest flashlight tubes, fan battery bays, and headlamp compartments. Removing the protection board also eliminates an extra layer of electrical resistance, which means more of the stored energy actually reaches your device, less is converted to waste heat, and voltage sag under load is reduced. Of course, this design philosophy asks something of you in return: always use a quality charger that terminates precisely at 4.2V, and only install the cell in devices that incorporate their own low‑voltage cutoff. Almost all modern LED flashlights, headlamps, and USB‑rechargeable fans already include this protection, making them perfect companions.

Your Choice of Terminal: Button Top or Flat Top

We understand that no single shape fits every gadget, so we supply both positive terminal styles. The Button Top version features a raised positive nipple (~1.5mm) that locks securely into spring‑loaded battery compartments and easily passes mechanical reverse‑polarity guards — a common requirement for many consumer flashlights and headlamps. The Flat Top version has a completely flush positive end, which is mandatory for devices with ultra‑tight battery tubes, for building custom spot‑welded battery packs, and for electronics that rely on pogo‑pin or flat PCB contacts. Simply check your device manual, select the correct variant, and experience a rattle‑free, reliable connection every time.

Where 3000mAh Truly Shines

Rated for a maximum continuous discharge of 5A (approximately 1.7C), this cell is optimized for medium‑drain applications — precisely the domain of flashlights, headlamps, and portable fans. In a compact LED flashlight, a single 3000mAh battery delivers around 3 hours of bright 300‑lumen output, or a full night on a gentle low mode. A lightweight headlamp can easily power a weekend camping trip or multiple evening runs on a single charge. A USB desk fan on low speed will spin for 8–10 hours, enough for an entire work shift or a long, hot night. And because you receive two cells, you can keep one in use and one fully charged as backup — no downtime, no waiting for a recharge when you need light or cooling the most.

Built for the Long Haul

Under the nickel‑plated steel shell, stable NMC chemistry maintains a true 3.7V nominal voltage and a remarkably flat discharge curve. Your flashlight beam doesn’t gradually fade, your fan doesn’t slowly lose speed, and your headlamp stays bright and trustworthy until the battery is nearly drained. Despite lacking an external protection IC, each cell incorporates a built‑in PTC thermistor that suppresses dangerous over‑current spikes, and a resealable pressure vent that activates under extreme internal stress. The rugged steel can resists drops, corrosion, and the bumps of daily life. With a cycle life of over 500 full charges and exceptionally low self‑discharge, these cells can sit in a drawer for months at storage voltage, then wake up ready to perform when the next blackout, camping trip, or heatwave arrives.

Key Features

• Genuine 3000mAh High Capacity (11.1Wh per cell)
  Delivers roughly 50% more energy than a 2000mAh cell. Provides approximately 3 hours of flashlight high‑mode runtime, 8–10 hours of headlamp use, or all‑day fan cooling — fewer interruptions, more peace of mind.

• 2‑Pack for Continuous Power
  Two identical cells let you keep one in your device and one fully charged in your bag. Perfect for extended outdoor activities, travel, or high‑use work environments.

• Unprotected, Compact Form
  Shorter than protected cells (65.0mm flat / 66.5mm button) to fit the most demanding battery compartments. Lower total resistance means more efficient power delivery and less heat.

• Dual Terminal Options: Button Top & Flat Top
  Button Top clicks securely into spring‑loaded contacts; Flat Top is essential for recessed contacts, tight tubes, and DIY welded packs. No adapters needed — total compatibility.

• Stable NMC Chemistry
  Maintains a steady 3.7V from a full 4.2V down to a safe 2.5V cutoff. Your light output stays constant, fan speed remains steady, and your headlamp doesn’t unexpectedly dim.

• Low Internal Resistance (≤65mΩ)
  Minimizes voltage sag under load. Even at the maximum 5A draw, voltage drops by only 0.325V, keeping your devices in regulation longer.

• 500+ Cycle Life & Minimal Self‑Discharge
  Recharge hundreds of times with negligible capacity fade. Store spare cells at 3.6–3.7V for months; they’ll still hold most of their charge when you need them.

• Integrated Passive Safety
  PTC thermistor guards against over‑current; resealable vent prevents pressure buildup. Steel can withstands impact, leaks, and corrosion.

• Eco‑Friendly & Cost‑Effective
  Replaces hundreds of single‑use alkaline batteries. Zero memory effect allows partial top‑ups anytime, reducing waste and saving money.

Technical Parameters

Applications

1. LED Flashlights & EDC Torches
   Drop one of these 3000mAh cells into your favorite EDC flashlight or tactical light. On a 300‑lumen medium setting, you’ll get roughly 3 hours of steady beam — enough for night hikes, security patrols, or power‑outage backup. Flat top fits ultra‑tight enthusiast tubes; button top locks securely into spring‑loaded hosts.

2. Headlamps for Work & Recreation
   Whether you’re a trail runner, a mechanic, or a camper reading in a tent, a headlamp powered by a 3000mAh cell provides over 8 hours of comfortable 100‑lumen light. The cell’s moderate weight keeps the headlamp balanced, reducing neck fatigue during extended use.

3. Portable Fans for All‑Day Cooling
   USB‑powered desk fans, stroller fans, and camping fans thrive on this high‑capacity cell. Low speed delivers 8–10 hours of gentle breeze; high speed offers 2–3 hours of strong airflow. With two cells, you can swap and stay cool around the clock. Flat top is often required for recessed fan battery bays.

4. Outdoor Camping Lights & Lanterns
   Compact camping lanterns and tent lights benefit from the 11.1Wh energy reserve, providing an entire night of illumination on a single charge. Keep the spare cell in your pack for multi‑day trips.

5. DIY Battery Packs & Hobby Electronics
   The flat top variant is ready for spot welding into 2S or 3S configurations for Bluetooth speakers, portable monitors, or Arduino projects. The unprotected design gives you full control over your BMS.

6. Emergency & Backup Power
   Store a few charged cells in a waterproof case for hurricanes, blackouts, or long road trips. Their low self‑discharge means they’re always ready when the grid is not.

FAQ

Q1: Is 3000mAh a true capacity? How much better is it than 2000mAh?
A: Yes, this cell uses high‑density NMC electrodes to deliver a genuine 3000mAh. It offers approximately 50% more energy than a standard 2000mAh battery. In practical terms, if your flashlight lasts 2 hours on a 2000mAh cell, this one will give you around 3 hours — a significant, user‑noticeable upgrade.

Q2: Why is this battery unprotected? Is it safe to use in my flashlight?
A: We omit the protection PCB to keep the cell shorter (fits more devices) and to reduce internal resistance. It’s completely safe when used correctly: charge only with a dedicated 4.2V Li‑ion charger, and use only in devices that have built‑in low‑voltage cutoff (most modern flashlights, headlamps, and USB fans already feature this). The cell itself includes a PTC thermistor and safety vent for passive protection.

Q3: Should I choose Button Top or Flat Top?
A: Check your device’s battery compartment. If the positive contact has a spring and a plastic ring around it, you likely need a Button Top for secure contact. If the tube is extremely tight or the contact is a flat metal pad (like in many ZebraLight models and some fans), you need a Flat Top. For building welded packs, always choose flat top.

Q4: Can I use this battery in an RC car or power tool?
A: This cell is rated for a maximum continuous discharge of 5A, which is perfect for flashlights, headlamps, and fans. RC cars, power tools, and sub‑ohm often demand 10–30A or more. Using this cell in such a high‑drain device would cause severe voltage sag, overheating, and potential damage. Please select our 10C high‑rate batteries for those applications.

Q5: How long will a 3000mAh battery run my portable fan?
A: On low speed (approximately 0.3–0.5A draw), expect 8–10 hours. On high speed (1.5–2A), around 2–3 hours. With two cells in the pack, you can swap and enjoy continuous cooling.

Q6: How should I store the spare battery?
A: Keep it in a plastic battery case away from metal objects and moisture. For storage longer than one month, adjust the voltage to about 3.6–3.7V (roughly 50% charge). Check the voltage every 3 months and recharge if it drops below 3.0V. Never store a fully depleted cell.

Q7: How many recharge cycles can I expect?
A: Over 500 full charge/discharge cycles while retaining at least 70% of the original capacity. For a device recharged once a week, that’s nearly 10 years of service.

Q8: Can I bring these batteries on an airplane?
A: Yes. At 11.1Wh per cell, they are well under the 100Wh IATA limit. Carry them in your hand luggage with the terminals insulated (electrical tape or a plastic case). Airlines allow multiple small lithium cells for personal use.

Q9: What charger should I use?
A: You must use a charger designed for 3.7V Li‑ion cells that terminates at exactly 4.2V. A basic smart charger from brands like Nitecore, XTAR, or LiitoKala works perfectly. Never use a NiMH or alkaline charger.