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A single-cell 18650 lithium-ion rechargeable battery (3.7 V, ~2200 mAh) with a cylindrical form factor (65 mm × 18 mm). Ideal for DIY power banks, flashlights, wearable electronics, and embedded projects. Features include stable voltage output, high energy density, and rechargeable via proper 3.7–4.2 V charging circuits. Compatible with battery holders, boost converters, and power supply modules. |
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