- 18650 batteries are most commonly used in rechargeable flashlights, cameras, LED clocks, and portable speakers and fans. They're also used to build battery packs and power banks such as those found in laptops. The 18650 name is based on their nominal size of 18 mm diameter by 65 mm length.
- Battery chargers refill or top off the charge of rechargeable batteries to allow for multiple uses. Use a charger that matches the battery chemistry, voltage, and brand of the batteries being charged to ensure compatibility and get an optimal charge. Charging at room temperature is also ideal to get an optimal charge.
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