18690 Battery

Updated September 20, 2026

Overview

Product sourcing insights & recommendations

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The term '18690 battery' is not a standard industry size but is widely understood as a specific reference to a protected 18650 battery. While a standard 18650 measures 18mm x 65mm, the addition of a Protection Circuit Board (PCB) and a button-top terminal increases the physical length to approximately 69mm Candlepowerforums Uniross.

Product Insights

* Dimensions: A "18690" is effectively a 18650 cell that has been extended by safety hardware. These cells typically measure 18.2mm–18.5mm in diameter and 68mm–69.5mm in length Candlepowerforums Uniross.

* Safety Features: The internal PCB protects the cell from over-charge, over-discharge, and short circuits. This makes them safer for consumer use in single-cell devices compared to "unprotected" cells intended for industrial packs Uniross.

* Compatibility Warning: Due to the extra 3-4mm in length, these batteries often do not fit in standard battery compartments or chargers designed strictly for 65mm cells Candlepowerforums.

Market Trends for 2026

The market for these cylindrical lithium-ion cells is experiencing a massive shift driven by electrification:

* Exponential Growth: The 18650/21700 market is projected to reach $20.11 billion by 2026, growing at a CAGR of 12.4% through 2035 Businessresearchinsights.

* Shift to 21700: While 18650 cells still hold 51% of the market, there is a clear trend toward the larger 21700 format in high-demand sectors like Electric Vehicles (EVs) and power tools due to higher energy density Businessresearchinsights.

* Supply Chain Resilience: Regional production is heavily concentrated in the Asia-Pacific region, which accounts for 65% of global production Businessresearchinsights.

* Sustainability Focus: By 2026, battery recycling is expected to become a core industry pillar, with current recycling rates already reaching 18-20% of total production volume Businessresearchinsights.

Top Applications

* Consumer Grade: High-end LED flashlights and portable DIY electronic projects where built-in protection is critical.

* Industrial Grade: Though standard 18650s dominate EV packs (55% of the market), protected variants are essential for standalone professional equipment Businessresearchinsights Uniross.

Based on the clarification that '18690' refers to protected cells, you can continue with: