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26650 and 18650 batteries are common types of lithium-ion rechargeable batteries used in various electronic devices. The primary differences between them are in size and capacity. 26650 batteries are larger and typically have a capacity of 4000 – 5000mAh, offering more power and longer life compared to 18650 batteries. They measure around 65mm in length and 26mm in diameter, making devices that use them larger and heavier. In contrast, 18650 batteries are smaller with a typical capacity of 2000 – 3500mAh. They have a length of 65mm and a diameter of 18mm, resulting in smaller and lighter devices.

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