18500 Batteries

16 products

📖 Click to view full specifications, comparison & safety guide

18500 Batteries – Mid-Size Cylindrical Cells, The Balanced Choice for Power and Capacity

Welcome to our 18500 Batteries collection. The 18500 lithium-ion cell (approx. 18mm diameter × 50mm length) is a medium-length cylindrical cell positioned between the compact 18350 (35mm) and the standard 18650 (65mm). It shares the standard 18mm diameter of the 18650, ensuring compatibility with most 18650 chargers and device battery compartments in terms of diameter, while its compact 50mm length fits devices with tighter length constraints. Mainstream 18500 capacities range from 1000mAh to 2000mAh, available in NMC, IMR, and LiFePO₄ chemistries, serving applications including high-performance flashlights, tactical equipment, medical instruments, power tools, vaping devices, portable lighting, and various mid-sized portable electronics.

Core Advantages of 18500 Batteries

18650 Diameter, Shorter Length: 18mm diameter—identical to 18650—ensures broad charger and device compatibility. Length of only 50mm—about 15mm shorter than 18650—fits devices with strict length restrictions.
Optimal Balance of Capacity and Size: Typical capacities of 1000mAh–2000mAh—roughly 1.5× to 2× that of same-diameter 18350 cells (700–1200mAh)—delivering extended runtime in a compact form factor.
High Voltage Platform: NMC/IMR versions deliver a nominal 3.7V (full charge 4.2V)—approximately 3× the voltage of NiMH cells—providing robust power output.
Flexible Chemistry Options: Available in high-energy NMC, high-drain IMR, and inherently safe LiFePO₄ formulations to meet diverse voltage, power, and safety requirements.
Rechargeable – Economical & Eco-Friendly: Supports 500–1,000+ charge/discharge cycles. Replaces disposable primaries for lower long-term cost.
Low Self-Discharge: Monthly self-discharge as low as 3% ensures readiness after extended storage.

18500 vs. 18350 vs. 18650 – Key Comparison

Parameter	18500	18350	18650
Dimensions	~18mm × ~50mm	~18mm × ~35mm	~18mm × ~65mm
Volume (approx.)	12.7 cm³	8.9 cm³	16.5 cm³
Typical Capacity Range	1000mAh – 2000mAh	700mAh – 1200mAh	1500mAh – 3500mAh
Nominal Voltage	3.2V (LiFePO₄) / 3.7V (NMC/IMR)	3.2V / 3.7V	3.2V / 3.7V
Energy (Wh)	3.7Wh – 7.4Wh	2.2Wh – 4.4Wh	5.5Wh – 13Wh
Key Strengths	18650 diameter compatible, moderate length	Shortest, ultra-compact spaces	Standard length, highest capacity
Typical Applications	Flashlights, medical devices, vaping	Mini flashlights, compact vapes	Universal across all categories

Popular 18500 Cell Models – Quick Reference

Model	Brand/Source	Chemistry	Nominal Capacity	Continuous Discharge	Dimensions (approx.)	Positioning
INR18500 2000mAh	Generic	NMC	2000mAh	5A–10A	18×50mm	High-capacity NMC; top choice for flashlights & digital devices
IMR18500 1500mAh	Generic	IMR	1500mAh	10A–15A	18×50mm	High-drain IMR; preferred for vaping & tactical lights
ICR18500 1800mAh	Generic	LiCoO₂	1800mAh	3A–5A	18×50mm	Balanced; general consumer electronics
IFR18500 1000mAh	Generic	LiFePO₄	1000mAh	3A–5A	18×50mm	LiFePO₄; high safety / long cycle life / 3.2V compatible
Vapcell INR18500 2000mAh	Vapcell	NMC	2000mAh	10A	18×50mm	High-performance NMC; preferred for bright flashlights
Efest IMR18500 1500mAh	Efest	IMR	1500mAh	15A	18×50mm	High-drain; vaping & tactical flashlight compatible
Keeppower Protected 18500	Keeppower	NMC + PCB	1800–2000mAh	5A–8A	18×51–52mm	Protected; consumer safety first choice

Typical Specifications Range (18500)

Parameter	Typical Range
Nominal Voltage	3.2V (LiFePO₄) / 3.6V–3.7V (NMC/IMR)
Full Charge Voltage	3.65V (LiFePO₄) / 4.2V (NMC/IMR)
Capacity Range	1000mAh – 2000mAh
Continuous Discharge Current	3A – 15A (model dependent)
Internal Resistance	20mΩ – 80mΩ
Cycle Life	500 – 1500+ cycles (chemistry dependent)
Operating Temperature	Charge: 0°C~45°C / Discharge: -20°C~60°C
Dimensions	Diameter 17.8mm–18.5mm × Length 49.5mm–52.0mm (protected slightly longer)
Weight	Approx. 28g – 35g

Typical Applications

Application	Recommended Type	Suggested Models
High-performance flashlights / tactical lights	NMC High-Capacity / IMR High-Drain	Vapcell 2000mAh, Efest IMR18500
Vaping / box mods	IMR High-Drain	Efest IMR18500
Portable medical devices / monitors	LiFePO₄ / Protected	IFR18500 1000mAh, Keeppower Protected
Power tools / electric toys	IMR High-Drain	Efest IMR18500
Industrial inspection / data terminals	NMC High-Capacity	Vapcell 2000mAh
Digital cameras / portable audio	NMC Balanced	ICR18500 1800mAh
Emergency lighting / security systems	LiFePO₄	IFR18500 1000mAh

How to Choose the Right 18500 Battery?

Your Requirement	Recommended Type	Suggested Model
I need maximum capacity for flashlights or digital devices	NMC High-Capacity	Vapcell 2000mAh, INR18500 2000mAh
I need high current output for vaping or tactical lights	IMR High-Drain	Efest IMR18500
I want built-in protection for worry-free use	Protected 18500	Keeppower Protected 18500
Safety is critical; for medical or emergency applications	LiFePO₄	IFR18500 1000mAh
I need bulk quantities or custom packs	Contact our sales team	—

⚠️ 18500 Battery Safety Guidelines

Voltage Platform Awareness: 3.2V LiFePO₄ and 3.7V NMC/IMR cells cannot be mixed or charged with the same charger.
Dimensional Fitment: 18500 length is ~50mm—about 15mm shorter than 18650. Some 18650 devices may not securely hold shorter cells; verify compatibility. Protected 18500s are slightly longer.
Use a Quality Charger: 18500 cells are compatible with most 18650 Li-ion chargers. Select a reliable charger that explicitly supports 18500 format.
Avoid Over-Discharge: Stop discharging when voltage drops below 2.5V–2.8V (NMC/IMR) or 2.0V–2.5V (LiFePO₄). Recharge promptly.
Avoid Short Circuits & Overheating: Do not short the terminals. Keep away from heat, moisture, and metal objects.
Discontinue if Damaged: Stop using cells with torn wraps, dents, or leakage. Recycle responsibly.

Why Choose Our 18500 Batteries?

Genuine Grade-A Cells: Sourced from Vapcell, Efest, Keeppower, and other reputable manufacturers. 100% authentic—no recycled or counterfeit cells.
Fully Tested & Matched: Every batch undergoes capacity grading, IR testing, and voltage sorting. Industrial-grade matching services available.
Complete Portfolio: Covers NMC high-capacity, IMR high-drain, protected, and LiFePO₄ series.
Flexible Purchasing: Single-cell retail, multi-pack discounts, tiered bulk pricing, and custom pack assembly.
Certified & Documented: UN38.3, MSDS, CE, RoHS documentation provided for seamless international shipping.
Expert Technical Support: Guidance on cell selection, pack design, BMS integration, and after-sales service.

👇👇👇 Browse the product list below and filter by capacity or chemistry to find the perfect 18500 cell for your application. For volume quotes or custom pack solutions, please contact our engineering team.

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