{"product_id":"15x-18650-battery-case-bms-pcba-protection-board-21v-housing-dc-socket","title":"15x 18650 Battery Case BMS Protection Board 21V Housing","description":"\n\u003ch2\u003e15x 18650 Li-Ion Battery Case with BMS PCBA Protection Circuit Board – 21V Housing with DC Input Socket\u003c\/h2\u003e\n\u003cp\u003eBuild your own reliable 21V lithium battery pack with this high-quality \u003cstrong\u003e15-slot 18650 battery case\u003c\/strong\u003e. Designed for DIY electronics enthusiasts, hobbyists, and makers, this battery housing features a built-in \u003cstrong\u003eBMS (Battery Management System) PCBA protection circuit board\u003c\/strong\u003e to help regulate charge and discharge cycles, guarding your cells against over-charge, over-discharge, and short-circuit conditions. The integrated DC input socket makes wiring straightforward and tidy.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFits 15 x 18650 Li-Ion cells\u003c\/strong\u003e – arranged for a 21V output configuration (cells not included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-in BMS PCBA protection circuit board\u003c\/strong\u003e – helps manage charge\/discharge and safeguard your battery cells\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e21V nominal output\u003c\/strong\u003e with DC input socket for easy integration\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurable construction\u003c\/strong\u003e – robust plastic shell with metal contacts for long-lasting use\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDIY-friendly design\u003c\/strong\u003e – ideal for custom power packs, electric tools, e-bikes, RC vehicles, and more\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact housing\u003c\/strong\u003e – neat, organised cell slots keep batteries secure during use\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Cells:\u003c\/strong\u003e 18650 Li-Ion (x15)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOutput Voltage:\u003c\/strong\u003e 21V\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic + Metal\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIncludes:\u003c\/strong\u003e BMS PCBA protection circuit board, DC input socket\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Includes:\u003c\/strong\u003e 1 x Battery Case Set (batteries NOT included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003ePlease allow 5–10mm differences due to manual measurement.\u003c\/li\u003e\n  \u003cli\u003eActual colour may vary slightly due to monitor settings and lighting conditions.\u003c\/li\u003e\n  \u003cli\u003e18650 cells are NOT included — this listing is for the case\/housing and BMS board only.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-channel-scr-solid-state-relay-switch-module-dc3-24v-40a-optocoupler\"\u003e1-Channel SCR Solid State Relay Module DC3-24V 40A Optocoupler\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10-pack-12v-3-pin-pc-fan-power-extension-cable-26cm-cpu-gpu-cooler\"\u003e10-Pack 12V 3-Pin PC Fan Extension Cable 26cm – CPU GPU Cooler\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor guidance on safe lithium battery handling and storage, refer to the U.S. Consumer Product Safety Commission – Lithium Battery Safety.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Battery_holder\" target=\"_blank\" rel=\"noopener\"\u003eBattery holder\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Do the 18650 batteries come included with this battery case?\u003c\/h4\u003e\n\u003cp\u003eA: No, the 18650 Li-Ion cells are NOT included. This listing covers the 15-slot battery housing, the BMS PCBA protection circuit board, and the DC input socket only. You will need to source 15 x 18650 cells separately.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What does the BMS protection circuit board do?\u003c\/h4\u003e\n\u003cp\u003eA: The BMS (Battery Management System) PCBA monitors and manages your 18650 Li-Ion cells during charging and discharging. It helps protect against over-charging, over-discharging, and short-circuit events, extending the life of your battery pack and improving overall safety.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the output voltage of this 15x 18650 battery case?\u003c\/h4\u003e\n\u003cp\u003eA: This battery case is designed for a 21V output configuration when loaded with 15 x 18650 Li-Ion cells connected in the appropriate series arrangement.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this suitable for DIY electric tools or e-bike battery packs?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this case is popular for DIY power projects including custom battery packs for power tools, electric scooters, RC vehicles, and portable power stations. Always ensure your cells and wiring are rated appropriately for your specific application.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Do the 18650 batteries come included with this battery case?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No, the 18650 Li-Ion cells are NOT included. This listing covers the 15-slot battery housing, the BMS PCBA protection circuit board, and the DC input socket only. You will need to source 15 x 18650 cells separately.\"}}, {\"@type\": \"Question\", \"name\": \"What does the BMS protection circuit board do?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The BMS (Battery Management System) PCBA monitors and manages your 18650 Li-Ion cells during charging and discharging. 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Always ensure your cells and wiring are rated appropriately for your specific application.\"}}]}\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:\/\/oasis-select.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Electronics \u0026 Tech\", \"item\": \"https:\/\/oasis-select.com\/collections\/electronics-tech\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"15x 18650 Battery Case BMS Protection Board 21V Housing\", \"item\": \"https:\/\/oasis-select.com\/products\/15x-18650-battery-case-bms-pcba-protection-board-21v-housing-dc-socket\"}]}\u003c\/script\u003e","brand":"Oasis Select","offers":[{"title":"1pc","offer_id":47727530377321,"sku":"14:496#1pc","price":11.06,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7931\/3257\/files\/S9feb1b5d4aa44dbea58134c3c94ce5acD.webp?v=1782662382","url":"https:\/\/oasis-select.com\/products\/15x-18650-battery-case-bms-pcba-protection-board-21v-housing-dc-socket","provider":"Oasis Select","version":"1.0","type":"link"}