{"product_id":"21v-18650-battery-case-holder-screwdriver-5s-50a-diy","title":"21V 18650 Battery Case Holder 5S 50A – DIY Screwdriver Pack","description":"\u003cp\u003eBuild or repair your own 21V power tool battery packs with this versatile \u003cstrong\u003e21V 18650 Battery Case Holder\u003c\/strong\u003e. Designed for 5-series (5S) configurations with a 50A continuous discharge rating, this case supports 5×, 10×, 15×, 20×, and 30× 18650 cell arrangements — making it ideal for DIY power tool battery assembly, replacement pack builds, and custom battery projects.\u003c\/p\u003e\n\n\u003cp\u003eConstructed from a durable \u003cstrong\u003eplastic and metal composite\u003c\/strong\u003e, this holder is built to withstand the rigors of hands-on use. An integrated circuit monitors individual cell voltage and tracks current usage history, helping you maintain optimal pack performance and balance over time.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide compatibility:\u003c\/strong\u003e Fits 5×, 10×, 15×, 20×, and 30× 18650 lithium cells in 5S configurations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-current rated:\u003c\/strong\u003e 50A continuous discharge supports demanding power tool applications\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21V output:\u003c\/strong\u003e Ideal for standard cordless screwdriver and drill battery replacement builds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated circuit monitoring:\u003c\/strong\u003e Tracks cell voltage and current usage history for smarter battery management\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable materials:\u003c\/strong\u003e Plastic and metal construction for long-lasting performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMultiple configurations:\u003c\/strong\u003e Choose from 10 color\/configuration options to suit your project needs\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIY-friendly design:\u003c\/strong\u003e Intended for users with hands-on experience in battery assembly and cell performance knowledge\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 21V (5S configuration)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMax Discharge Current:\u003c\/strong\u003e 50A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Cells:\u003c\/strong\u003e 18650 lithium-ion\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCell Count Options:\u003c\/strong\u003e 5×, 10×, 15×, 20×, 30×\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic + Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Cordless screwdriver \/ power tool battery pack building \u0026amp; repair\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e⚠️ \u003cstrong\u003eSafety Note:\u003c\/strong\u003e This product is intended for individuals with knowledge of lithium-ion battery performance and hands-on experience in battery assembly. Always follow safe battery handling practices. For guidance on lithium battery safety, refer to CPSC Lithium-Ion Battery Safety Information.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What is the 21V 18650 Battery Case Holder used for?\u003c\/h4\u003e\n\u003cp\u003eA: This 21V 18650 Battery Case Holder is designed for building or repairing cordless screwdriver and power tool battery packs. It supports 5S (5-series) configurations using 18650 lithium-ion cells, making it a great DIY solution for custom replacement battery packs with 5×, 10×, 15×, 20×, or 30× cell arrangements.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the 21V 18650 Battery Case made of?\u003c\/h4\u003e\n\u003cp\u003eA: The battery case is constructed from a combination of plastic and metal, providing a sturdy and durable enclosure suitable for demanding DIY battery assembly applications.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this battery case include a built-in protection circuit?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this 18650 battery holder features an integrated circuit that monitors individual cell voltage and tracks current usage history, helping to keep your battery pack balanced and performing optimally during use.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this product suitable for beginners?\u003c\/h4\u003e\n\u003cp\u003eA: This 21V battery case holder is intended for users with prior knowledge of lithium-ion battery performance and hands-on experience in battery assembly. 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