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Stay powered up with the 606090 Polymer Lithium Battery! This 3.7V 4000mAh power bank battery core is perfect for creating your own custom power banks. Its soft pack design makes it flexible and easy to integrate into various devices. Whether you're a DIY enthusiast or a professional, this battery core offers high capacity and reliable performance.
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**Cross-Border Smart Fast Charging USB Battery Charger - The Ultimate Charging Solution**