Your Everyday Power, Doubled
Two batteries, one simple promise: keep your essential devices running longer without breaking the bank. Each cell in this 2‑pack stores a genuine 2000mAh, or 7.4 watt‑hours, of energy — enough to power a compact LED flashlight through an evening walk, keep a headlamp glowing on a weekend camping trip, spin a portable fan for an entire work shift, or supply a wireless doorbell with standby power that lasts for months. The pack gives you the freedom to swap and go, so you’re never left waiting for a recharge.
Unprotected for Maximum Flexibility
We leave the protection PCB off these cells on purpose. Without the extra length of a protection circuit, each battery measures only 65.0mm (flat top) or 66.5mm (button top) — short enough to slide into the tightest battery tubes, slim headlamp compartments, and recessed fan or doorbell battery bays. Removing the PCB also strips away an extra layer of electrical resistance, which means less energy is wasted as heat and more reaches your device. Of course, this design places a small responsibility on you: always charge with a quality Li‑ion charger that stops at exactly 4.2V, and only use these cells in devices that feature built‑in low‑voltage cutoff. Virtually every modern LED flashlight, headlamp, USB fan, and smart doorbell already includes this protection, making them ideal partners.
Button Top or Flat Top — Your Choice
Every device has its own contact design. That’s why we offer both terminal styles. The Button Top variant has a raised positive nipple (~1.5mm) that locks firmly into spring‑loaded compartments and passes mechanical reverse‑polarity guards with ease. The Flat Top variant features a completely flush positive terminal, which is required for ultra‑compact devices, for building custom spot‑welded battery packs, and for any gadget with pogo‑pin or flat PCB contacts. Simply check your device’s manual, select the right shape, and enjoy a stable, rattle‑free connection.
Where 2000mAh Makes Perfect Sense
Rated for a continuous discharge of up to 5A, these cells are ideally matched to the moderate power demands of flashlights, headlamps, fans, and doorbells. In an LED flashlight, one 2000mAh cell delivers roughly 2 hours of bright 300‑lumen light, or more than 8 hours on a low mode. A lightweight headlamp will run for an entire night of reading or a full shift of close‑up work. A portable USB fan on low speed spins for 5–6 hours, keeping your desk or tent comfortable. And in a wireless doorbell, the combination of ultra‑low standby current and 7.4Wh of capacity means you can easily go 6–12 months between charges. With two cells, you keep one in the device and one in the charger — no downtime, no drama.
Built to Last, Inside and Out
The nickel‑plated steel housing protects against drops, corrosion, and everyday wear. Inside, advanced NMC chemistry holds a stable 3.7V nominal voltage and a flat discharge curve, so your light doesn’t fade and your fan doesn’t slow until the battery is almost empty. Even without an external protection IC, each cell includes a PTC thermistor to clamp down on over‑current and a resealable safety vent that releases pressure in extreme conditions. With a cycle life of over 500 full charges and very low self‑discharge, these batteries can sit in a drawer for months and still wake up ready. They replace hundreds of disposable alkalines, saving money and cutting waste — a small investment for years of reliable service.
Key Features
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Genuine 2000mAh Capacity (7.4Wh per cell)
Honest, usable energy for your daily devices. Delivers about 2 hours of flashlight high‑mode light, all‑day fan cooling, or many months of doorbell standby. -
2‑Pack for Uninterrupted Power
Two identical cells. Use one while the other charges — perfect for tools, lights, and gadgets you rely on every day. -
Unprotected, Space‑Saving Design
Shorter than protected cells (65.0mm flat / 66.5mm button). Fits tight compartments and reduces internal resistance for cooler, more efficient power delivery. -
Choose Button Top or Flat Top
Button Top clicks securely into spring‑contact devices. Flat Top is required for recessed contacts, welded packs, and ultra‑tight hosts. Full compatibility, zero guesswork. -
Stable NMC Chemistry
Holds a steady 3.7V from a full 4.2V down to a safe 2.5V cutoff. Brightness and motor speed stay consistent throughout the discharge. -
Low Internal Resistance (≤80mΩ)
Minimal voltage drop under load. Even at 5A, the sag is only 0.4V — keeping your devices in regulation longer. -
500+ Cycle Life & Low Self‑Discharge
Recharge over 500 times with minimal capacity loss. Store spare cells at 3.6–3.7V for months; they’ll still be ready to go. -
Built‑In Passive Safety
PTC thermistor and resealable vent protect against over‑current and pressure buildup. Steel can withstands drops and corrosion. -
Eco‑Friendly & Affordable
Replaces hundreds of single‑use batteries. Zero memory effect — top up anytime without damage.
Technical Parameters
| Parameter | Specification |
|---|---|
| Battery Type | 18650 Li‑ion (unprotected, bare cell) |
| Nominal Capacity per Cell | 2000mAh (7.4Wh) |
| Pack Count | 2 cells |
| Nominal Voltage | 3.7V |
| Full Charge Voltage | 4.2V ± 0.05V |
| Discharge Cut‑off Voltage | 2.5V (use only with low‑voltage protected devices) |
| Standard Charge Current | 1.0A (0.5C) |
| Max Continuous Discharge | 5A (2.5C) — suited for medium‑drain devices |
| Max Pulse Discharge | 7A (<5 seconds) |
| Internal Resistance | ≤80mΩ (AC 1kHz, bare cell) |
| Protection Circuit | None — requires external over‑discharge protection |
| Positive Terminal Options | Button Top (raised ~1.5mm) or Flat Top (flush) |
| Dimensions (Button Top) | Approx. 18.3mm dia. × 66.5mm length |
| Dimensions (Flat Top) | Approx. 18.3mm dia. × 65.0mm length |
| Weight (Button Top) per cell | Approx. 44g |
| Weight (Flat Top) per cell | Approx. 43g |
| Cycle Life per cell | ≥500 cycles (≥70% initial capacity at 0.5C) |
| Operating Temp. (Charge) | 0°C to 45°C |
| Operating Temp. (Discharge) | -20°C to 60°C |
| Storage Temp. & Humidity | -5°C to 35°C, <75% RH (recommend 3.6–3.7V storage) |
| Chemistry | NMC (Lithium Nickel Manganese Cobalt Oxide) |
Applications
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Flashlights & EDC Torches
Pop a 2000mAh cell into your pocket flashlight or compact torch. It provides about 2 hours of bright 300‑lumen light, or a full night of low‑mode glow — ideal for dog walks, power outages, and everyday carry. Flat top for tight tubes, button top for spring‑loaded hosts. -
Headlamps for Hands‑Free Tasks
Reading in bed, fixing a sink, or an evening jog — all demand a lightweight headlamp that won’t weigh you down. The 2000mAh battery keeps the unit balanced and delivers hours of comfortable illumination. -
Portable Fans for Work & Travel
USB desk fans, stroller fans, and camping fans run smoothly on this cell. Low speed gives 5–6 hours of breeze; high speed about 1.5 hours. With two cells, you’re never stuck in the heat. -
Wireless Doorbells & Smart Sensors
Devices that sip microamps in standby can run for 6–12 months on a single 2000mAh charge. The unprotected flat top fits many original battery cradles, offering a cost‑effective replacement. -
Solar Garden Lights
Many outdoor solar lights use 18650s in the 1500–2000mAh range. This 2‑pack is a perfect direct replacement, storing ample daytime energy for all‑night illumination. -
DIY Electronics & Hobby Kits
Arduino projects, small IoT sensors, and LED displays that draw well under 1A are perfectly powered by these affordable cells. Flat top ready for spot welding.
FAQ
Q1: Is 2000mAh enough capacity? Should I buy a higher capacity?
A: For flashlights, headlamps, fans, and doorbells, 2000mAh is perfectly adequate — providing hours of light, cooling, or months of standby. It’s the sweet spot of price and performance for low‑to‑medium drain devices. If you need extreme runtime for a turbo flashlight or heavy‑duty use, consider our 3000mAh or 3500mAh models.
Q2: Why no protection circuit?
A: Removing the protection PCB shortens the cell to fit more devices and lowers internal resistance. Safety is ensured by using the battery only in devices with their own low‑voltage cutoff (which almost all modern flashlights, headlamps, USB fans, and doorbells have) and charging with a quality 4.2V Li‑ion charger.
Q3: Button Top or Flat Top — which do I need?
A: If your device’s positive contact has a spring and a plastic ring, choose Button Top. If the compartment is very tight or the contact is a flat metal pad, choose Flat Top. For welded packs, always flat top. Check your device manual if unsure.
Q4: Can I use this battery in a high‑drain RC car?
A: No. This cell is rated for 5A continuous. High‑drain devices can draw 10–30A, which would overheat this cell and potentially cause damage. For those, select our high‑rate 10C/20A batteries.
Q5: How long does it take to charge?
A: At the standard charge rate of 1A, a fully drained 2000mAh cell takes about 2.5 hours. Using a 0.5A charger will take roughly 5 hours. Always use a smart Li‑ion charger.
Q6: Can I store the spare battery for a long time?
A: Yes. Keep it in a plastic case away from metal. For storage over one month, bring the voltage to about 3.6–3.7V (50% charge). Check every 3 months and top up if below 3.0V.
Q7: Are these batteries allowed on airplanes?
A: Yes. At 7.4Wh each, they are well under the 100Wh IATA limit. Carry them in hand luggage with terminals insulated.
Q8: How many cycles will I get?
A: Over 500 full charge/discharge cycles with ≥70% capacity retention. That’s years of regular use.
