Reliable Power Solution – This 18650 rechargeable lithium-ion battery delivers a consistent 3.7V output, perfect for a wide range of electronics such as flashlights, headlamps, electric fans, speakers, and emergency lights. Long Life & High Energy Density – Built to last with high-quality cells, it offers long battery life and superior energy density—ideal for both frequent and occasional use. No Memory Effect – Enjoy reliable charging every time with no memory effect, making the battery more efficient and dependable for long-term use. Compact & Durable Design – Measures 6.6 x 1.8 cm (L x D) with a solid construction that ensures safety during use. Designed for repeated recharges without performance drops. Multi-Purpose Compatibility – Suitable for amplifiers, flashlights, video equipment, portable power devices, electric mosquito swatters, and other compatible devices using 18650 batteries.