{"product_id":"21700-li-ion-battery-case-pcb-protection-circuit-board","title":"21700 Li-Ion Battery Case with PCB Protection Circuit Board","description":"\u003cp\u003eKeep your 21700 lithium-ion cells safely housed and electrically protected with this sturdy \u003cstrong\u003e21700 Li-Ion Battery Case with PCB Protection Circuit Board\u003c\/strong\u003e. Designed for hobbyists, electronics enthusiasts, and experienced battery pack builders, this enclosure combines a rugged plastic shell with a metal-reinforced frame and an integrated PCB protection circuit — all in one compact unit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠ Important Notice:\u003c\/strong\u003e This product is a component only — \u003cem\u003eno battery core is included\u003c\/em\u003e. It is intended exclusively for individuals with hands-on experience in battery assembly and a solid understanding of lithium-ion cell performance and safety. Not recommended for beginners.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIntegrated PCB Protection Circuit:\u003c\/strong\u003e Built-in circuit board helps guard against overcharge, over-discharge, and short-circuit conditions during battery pack assembly.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable Construction:\u003c\/strong\u003e Made from high-quality plastic and metal for long-lasting everyday reliability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Practical Size:\u003c\/strong\u003e Measures 4.33 × 2.95 × 2.75 in (11 × 7.5 × 7 cm) — easy to work with and store.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSleek Black Finish:\u003c\/strong\u003e Clean, professional black colorway suits any workshop or electronics project setup.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesigned for Battery Pack Repair \u0026amp; Assembly:\u003c\/strong\u003e Ideal for rebuilding or customizing 21700-format lithium-ion battery packs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReusable \u0026amp; Rechargeable-Ready:\u003c\/strong\u003e Supports rechargeable battery configurations, reducing the need for single-use cells.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic + Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4.33 × 2.95 × 2.75 in \/ 11 × 7.5 × 7 cm\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Cell Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e21700 Lithium-Ion\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncludes\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCase with PCB Protection Circuit Board (battery core NOT included)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eWho Is This For?\u003c\/h2\u003e\n\u003cp\u003eThis battery case is built for makers, electronics repair technicians, and experienced DIY battery pack assemblers. If you're rebuilding a power bank, building a custom e-bike battery, or repairing an existing lithium-ion pack using 21700 cells, this enclosure with its onboard protection circuit is a smart, reliable foundation for your project.\u003c\/p\u003e\n\n\u003cp\u003eFor more guidance on lithium-ion battery safety standards and handling, refer to the U.S. Consumer Product Safety Commission – Lithium-Ion Battery Safety Information Center.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\n\u003ch4\u003eQ: What does the 21700 Li-Ion Battery Case with PCB Protection Circuit Board do?\u003c\/h4\u003e\n\u003cp\u003eA: This case provides a secure housing for 21700-format lithium-ion cells along with an integrated PCB protection circuit board designed to help protect against common electrical faults such as overcharging, over-discharging, and short circuits during battery pack assembly and use.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does this product include a battery?\u003c\/h4\u003e\n\u003cp\u003eA: No — this is a component-only product. The battery case and PCB protection circuit board are included, but the 21700 lithium-ion battery cell itself is \u003cstrong\u003enot included\u003c\/strong\u003e. You will need to source compatible 21700 cells separately.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Who should use this battery case?\u003c\/h4\u003e\n\u003cp\u003eA: This product is intended for individuals with practical experience in battery assembly and a solid understanding of lithium-ion cell performance and safety. It is suitable for electronics repair technicians, experienced hobbyists, and DIY battery pack builders — not recommended for beginners or those unfamiliar with lithium-ion battery handling.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What are the dimensions and materials of this case?\u003c\/h4\u003e\n\u003cp\u003eA: The case measures 4.33 × 2.95 × 2.75 inches (11 × 7.5 × 7 cm) and is constructed from a combination of durable plastic and metal for strength and longevity.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the 21700 Li-Ion Battery Case with PCB Protection Circuit Board do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This case provides a secure housing for 21700-format lithium-ion cells along with an integrated PCB protection circuit board designed to help protect against common electrical faults such as overcharging, over-discharging, and short circuits during battery pack assembly and use.\"}}, {\"@type\": \"Question\", \"name\": \"Does this product include a battery?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — this is a component-only product. The battery case and PCB protection circuit board are included, but the 21700 lithium-ion battery cell itself is not included. You will need to source compatible 21700 cells separately.\"}}, {\"@type\": \"Question\", \"name\": \"Who should use this battery case?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This product is intended for individuals with practical experience in battery assembly and a solid understanding of lithium-ion cell performance and safety. It is suitable for electronics repair technicians, experienced hobbyists, and DIY battery pack builders — not recommended for beginners or those unfamiliar with lithium-ion battery handling.\"}}, {\"@type\": \"Question\", \"name\": \"What are the dimensions and materials of this case?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The case measures 4.33 × 2.95 × 2.75 inches (11 × 7.5 × 7 cm) and is constructed from a combination of durable plastic and metal for strength and longevity.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/vpggdm-rp.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Phone \u0026 Cable Accessories\", \"item\": \"https:\/\/vpggdm-rp.myshopify.com\/collections\/phone-cable-accessories\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"21700 Li-Ion Battery Case with PCB Protection Circuit Board\", \"item\": \"https:\/\/vpggdm-rp.myshopify.com\/products\/21700-li-ion-battery-case-pcb-protection-circuit-board\"}]}\u003c\/script\u003e","brand":"Qme","offers":[{"title":"Default Title","offer_id":49733191729366,"sku":"\u003cnone\u003e","price":19.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0827\/5243\/8486\/files\/S915646361f644ab6af014478187b4361M.webp?v=1785309018","url":"https:\/\/qmeboost.com\/products\/21700-li-ion-battery-case-pcb-protection-circuit-board","provider":"Qme","version":"1.0","type":"link"}