1500mAh (5.55Wh) 3.7V 18650 Li-ion Rechargeable Battery (2-Pack) – for Mini Flashlights, Headlamps, Doorbells & Solar Lights

Small Capacity, Smart Choice
Not every device needs a 3500mAh marathon cell. For many everyday gadgets, a lighter, more affordable 1500mAh battery is the perfect fit — and this 2‑pack delivers exactly that. Each cell stores 5.55 watt‑hours of genuine energy, purpose‑built for low‑drain applications where a giant battery would add unnecessary cost and weight. Slide one into a mini flashlight for occasional pocket use, a lightweight headlamp for quick tasks, a wireless doorbell that sips power for months, or a solar garden light that needs just enough energy to glow from dusk till late evening. The second cell stays charged and ready, so you’re never left in the dark.

Unprotected Design: Shorter, Lighter, More Efficient
We intentionally leave off the external protection PCB to make these cells as compact and electrically pure as possible. At only 65.0mm (flat top) or 66.5mm (button top), they slip effortlessly into tight battery compartments that refuse to accept longer protected cells — think slim headlamps, compact solar lights, and tiny LED torches. Removing the PCB also eliminates an extra layer of resistance, so more of the battery’s energy reaches your device and less is wasted as heat. The trade‑off is simple: you must use a quality charger that stops precisely at 4.2V, and only insert the cell into devices that have their own built‑in low‑voltage cutoff. Nearly all modern mini flashlights, headlamps, doorbells, and solar charge controllers already incorporate this, making them ideal partners.

Choose Your Terminal: Button Top or Flat Top
We offer both terminal styles so you never have to compromise. The Button Top version has a raised positive nipple (~1.5mm) that locks securely into spring‑loaded compartments and easily clears mechanical reverse‑polarity rings — common in many consumer flashlights and headlamps. The Flat Top version has a completely flush positive end, which is essential for devices with ultra‑tight battery tubes, for building spot‑welded DIY battery packs, and for gadgets that use pogo‑pin or flat PCB contacts. Simply pick the variant that matches your device’s manual, and enjoy a rattle‑free connection every time.

Where 1500mAh Is Exactly Right
Rated for a continuous discharge of up to 3A (2C), these cells are tailor‑made for low to moderate power draws. In a mini pocket flashlight, the 1500mAh capacity provides around an hour of bright 150‑lumen light, or several hours on a low mode — perfect for finding a keyhole, walking the dog, or navigating a dark hallway. In a lightweight headlamp used for reading or close‑up work, it delivers hours of comfortable illumination without weighing down your forehead. In a wireless doorbell, the ultra‑low standby current means a single charge can last well over a year. And in a solar‑powered garden light, the 5.55Wh energy buffer stores a full day’s sun and releases it as gentle nighttime glow, far outlasting the smaller 800–1200mAh cells often bundled with these fixtures. With two cells in the pack, you can keep one in use and one on standby — zero downtime.

Safety and Longevity
Each cell includes a built‑in PTC thermistor that suppresses dangerous over‑current spikes, and a resealable pressure vent that activates if internal pressure ever reaches a critical level. The nickel‑plated steel can withstands drops, corrosion, and daily knocks. 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 with most of their capacity intact. This 2‑pack replaces dozens of disposable alkaline batteries over its lifetime, saving you money and reducing waste — a smart choice for your low‑drain devices and the planet.

Key Features

• 2‑Pack Value Set
  Two identical 1500mAh cells. Keep one in your device, one fully charged in reserve — ideal for intermittent, low‑drain gadgets.

• Genuine 1500mAh Capacity (5.55Wh per cell)
  Honest energy for power‑sipping electronics. Great for mini flashlights, headlamps, doorbells, and solar lights that don’t require extended runtime.

• Unprotected Design for Compactness & Efficiency
  Shorter overall length fits tight battery compartments. Lower internal resistance ensures efficient power delivery with minimal heat. Requires a 4.2V Li‑ion charger and a device with low‑voltage cutoff.

• Dual Terminal Options: Button Top & Flat Top
  Button Top clicks securely into spring‑contact devices. Flat Top is mandatory for recessed contacts, welded packs, and ultra‑compact gadgets. Full compatibility, no adapters.

• Stable ICR/NMC Chemistry
  Holds a steady 3.7V nominal voltage from 4.2V down to 2.5V. Your light stays consistent, your doorbell remains reliable, and your solar light shines evenly night after night.

• 500+ Cycle Life & Low Self‑Discharge
  Recharge each cell over 500 times with minimal capacity fade. Store the spare for months at 3.6–3.7V; it will still be ready when needed.

• Built‑In Passive Safety
  Integrated PTC thermistor and resealable vent provide foundational protection against over‑current and internal pressure. Rugged steel can resists impact and corrosion.

• Economical & Eco‑Friendly
  Affordable power for low‑drain devices. Replaces dozens of disposable alkaline batteries, cutting waste and long‑term costs.

Technical Parameters

Applications

1. Mini Flashlights & Pocket Torches
Tiny EDC lights and keychain torches often need just a small 18650. The 1500mAh cell provides about an hour of useful light on a medium mode, or multiple evenings of occasional pocket use. Flat top fits ultra‑tight tubes; button top secures firmly in spring‑contact hosts.

2. Lightweight Headlamps for Short Tasks
Reading in bed, fixing a leak under the sink, or an evening jog doesn’t demand a heavy, high‑capacity battery. The 1500mAh cell keeps the headlamp light and balanced, while still delivering several hours of low‑to‑medium brightness. Button top is usually preferred for spring‑loaded headlamp compartments.

3. Wireless Doorbells & Smart Sensors
These devices consume microscopic standby current and only pulse during a ring event. A single 1500mAh cell can power a doorbell for 6–12 months easily. The unprotected flat top fits the original battery cradle in many smart doorbell models that already manage their own low‑voltage protection.

4. Solar‑Powered Garden & Path Lights
Many outdoor solar lights come with 18650 batteries in the 1200–1500mAh range. This 2‑pack is the perfect direct replacement. Swap in a fresh cell, and your lights will store daytime energy and illuminate your garden or pathway throughout the night. Ensure the solar light’s charge controller includes over‑discharge protection.

5. DIY Electronics & STEM Kits
Arduino projects, small IoT sensors, and LED displays that draw well under 1A run happily on these 1500mAh cells. The flat top is ready for spot welding into 2S or 3S packs. The affordable price makes them a favorite for educational and hobbyist builds.

6. Emergency Backup Lighting
Keep a couple of charged cells in a waterproof case. When a power outage hits or you need a spare for a small lantern, these lightweight batteries are easy to store and quick to deploy.

FAQ

Q1: Is 1500mAh enough capacity? It sounds low.
A: It’s intentionally compact. For low‑drain devices like doorbells, solar lights, and mini flashlights used occasionally, 1500mAh is more than adequate — providing months of standby or hours of useful light. If you need marathon runtime for a high‑power flashlight or fan, consider our 2500mAh or 3500mAh models. Choose the capacity that matches your device’s actual need.

Q2: Why is this battery unprotected?
A: We omit the protection PCB to keep the cell as short as possible (fits more devices) and to reduce internal resistance. It’s completely safe when used in a device that has its own low‑voltage cutoff (most modern mini flashlights, headlamps, doorbells, and solar controllers do) and charged with a proper 4.2V Li‑ion charger. The built‑in PTC and vent add an extra layer of passive protection.

Q3: How do I choose between Button Top and Flat Top?
A: Check your device’s battery compartment. If the positive contact has a spring and a physical ring around it, a Button Top is usually needed to make firm contact. If the tube is extremely tight or the contact is a flat metal pad/PCB trace, you need a Flat Top. For building welded battery packs, always choose flat top.

Q4: Can I use these batteries in a high‑drain RC car or power tool?
A: No. These cells are rated for a maximum continuous discharge of 3A. RC cars and power tools typically demand 5–20A or more, which would cause the battery to overheat, sag severely, and possibly vent. For high‑drain applications, please select our high‑rate 10C cells.

Q5: How long will a 1500mAh battery last in a mini fan?
A: A very small USB fan drawing 0.5A on low speed might run for roughly 3 hours. A more powerful fan drawing 1A would last about 1.5 hours. The 2‑pack lets you swap and keep the breeze going.

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 a month, adjust the voltage to about 3.6–3.7V (roughly 50% charge). Check it every 3 months and recharge if the voltage drops below 3.0V. Never store a completely empty cell.

Q7: How many recharge cycles can I expect?
A: Over 500 full charge/discharge cycles while still retaining at least 70% of the original capacity. For low‑drain devices that are charged infrequently, this can easily translate to many years of reliable service.

Q8: Can I take these batteries on an airplane?
A: Yes. At 5.55Wh per cell, they are well under the 100Wh IATA limit. Always carry lithium batteries in your hand luggage, and insulate the terminals with tape or a plastic case.

Q9: What charger should I use?
A: You must use a charger specifically designed for 3.7V Li‑ion cells that terminates at exactly 4.2V. A basic single‑bay smart charger is perfect. Never use a charger intended for NiMH or alkaline batteries.