{"product_id":"21700-plastic-case-bms-pcba-for-makita-18v-li-ion-battery-diy-kit","title":"21700 Plastic Case + BMS PCBA for Makita 18V Li-ion Battery (DIY Kit)","description":"\u003cdiv style=\"font-family: Arial, sans-serif; line-height: 1.5;\"\u003e\n\u003ch2\u003e21700 Plastic Case + BMS PCBA for Makita 18V Li-ion Battery (DIY Kit)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eDIY Semi-Manufactured Battery Enclosure with Integrated BMS\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis product is a \u003cstrong\u003e21700 battery shell with integrated BMS PCBA\u003c\/strong\u003e, designed for building a Makita 18V compatible lithium-ion battery pack. It is intended for experienced DIY builders who understand lithium-ion battery assembly and safety procedures.\u003c\/p\u003e\n\u003cdiv style=\"padding: 12px; border: 1px solid #ddd; border-radius: 10px; margin: 14px 0;\"\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eImportant:\u003c\/strong\u003e This product includes the \u003cstrong\u003eplastic case and PCB only\u003c\/strong\u003e.\u003cbr\u003e\u003cstrong\u003eNo battery cells included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cp\u003eThis enclosure allows you to build a \u003cstrong\u003e10-cell 21700 lithium-ion battery pack\u003c\/strong\u003e configuration. The integrated BMS includes balanced charging functionality and multiple protection features to help ensure safe operation and extend pack lifespan.\u003c\/p\u003e\n\u003ch3\u003eBMS Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eBuilt-in IC for individual cell voltage detection\u003c\/li\u003e\n\u003cli\u003eBalanced charging function\u003c\/li\u003e\n\u003cli\u003eOvercharge protection\u003c\/li\u003e\n\u003cli\u003eOver-discharge protection\u003c\/li\u003e\n\u003cli\u003eOvercurrent protection\u003c\/li\u003e\n\u003cli\u003eOvervoltage protection\u003c\/li\u003e\n\u003cli\u003eOverheat protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe balancing function helps keep each cell at a consistent voltage level, improving pack efficiency and supporting longer service life.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned for \u003cstrong\u003e10\u003c\/strong\u003e pieces of \u003cstrong\u003e21700\u003c\/strong\u003e lithium-ion cells\u003c\/li\u003e\n\u003cli\u003eCompatible with \u003cstrong\u003eMakita 18V\u003c\/strong\u003e platform (aftermarket \/ DIY use)\u003c\/li\u003e\n\u003cli\u003eIntegrated BMS PCBA\u003c\/li\u003e\n\u003cli\u003eLED indicator included\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"padding: 12px; background: #f7f7f7; border: 1px solid #e6e6e6; border-radius: 10px; margin: 14px 0;\"\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eBatch \/ Inventory Notice:\u003c\/strong\u003e\u003cbr\u003ePCB color may vary (blue, white, green, red, etc.). LED color may vary (red, green, or blue).\u003cbr\u003ePCB design, version, and labeling may change between batches while maintaining the same function and performance.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eRequirements Before Purchase\u003c\/h3\u003e\n\u003cp\u003eThis is a DIY battery assembly component. To use this product properly, you must have:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e21700 high-drain lithium-ion cells\u003c\/li\u003e\n\u003cli\u003eSpot welder\u003c\/li\u003e\n\u003cli\u003eSoldering tools\u003c\/li\u003e\n\u003cli\u003eMultimeter\u003c\/li\u003e\n\u003cli\u003eProper lithium-ion charger\u003c\/li\u003e\n\u003cli\u003eBattery pack building knowledge and experience\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"padding: 12px; border-left: 6px solid #d9534f; background: #fff5f5; border-radius: 10px; margin: 14px 0;\"\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eVery Important:\u003c\/strong\u003e Ensure that the voltage of each 21700 cell is the \u003cstrong\u003ethe same\u003c\/strong\u003e before welding the PCB.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhat’s Included\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1x Plastic battery case\u003c\/li\u003e\n\u003cli\u003e1x Integrated BMS PCB\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv style=\"padding: 12px; border: 1px solid #ddd; border-radius: 10px; margin: 14px 0;\"\u003e\n\u003cp style=\"margin: 0;\"\u003e\u003cstrong\u003eNot Included:\u003c\/strong\u003e Battery cells, charger, tools, or any other accessories.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch3\u003eAdvance Notice (Read Carefully)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eProduct images are for reference only. Actual size\/color may vary slightly.\u003c\/li\u003e\n\u003cli\u003ePCB label may not match the photo and may change by batch.\u003c\/li\u003e\n\u003cli\u003eIf you have objections to color differences, label differences, or PCB design changes, please do not purchase.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eImportant Disclaimer\u003c\/h3\u003e\n\u003cp\u003eThis is \u003cstrong\u003enot an original Makita product\u003c\/strong\u003e. This is an aftermarket DIY component.\u003cbr\u003e\u003cstrong\u003eNo battery cells included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr style=\"margin: 20px 0;\"\u003e\n\u003ch3\u003eSafety Warning for Lithium-Ion Battery Usage\u003c\/h3\u003e\n\u003cp\u003eCustomers should have a clear understanding of lithium-ion battery handling and safety before making a purchase. Lithium-ion batteries are highly sensitive and may pose fire, burn, or explosion risks if improperly handled. Always charge batteries on fire-resistant surfaces, and never leave them charging unattended.\u003c\/p\u003e\n\u003cp\u003eBy purchasing, you assume full responsibility for any injury, damage, or loss arising from the incorrect use or handling of lithium-ion batteries or chargers. Compatibility with specific devices is not guaranteed. Only charge using a smart charger designed specifically for this battery type, and do not mix old or used batteries with new ones.\u003c\/p\u003e\n\u003ch4\u003eImportant Usage Guidelines:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNot for Use in E-Cigarettes or Similar Devices:\u003c\/strong\u003e Lithium-ion batteries present a serious risk of injury, property damage, or even death if improperly used.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRisk of Fire and Explosion:\u003c\/strong\u003e Misuse can cause batteries to ignite, explode, or release harmful gases.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlways Use in a Protected Pack:\u003c\/strong\u003e Ensure batteries are used within intended specifications and supported by appropriate circuitry.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProper Storage and Handling:\u003c\/strong\u003e Store batteries in protective cases, away from metal items to prevent short circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInspection Prior to Use:\u003c\/strong\u003e Do not use batteries with damaged wrappers, torn insulators, or visible damage.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFollow Manufacturer's Charging Specifications:\u003c\/strong\u003e Avoid overcharging or over-discharging, and never alter, dismantle, puncture, crush, or burn.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat and Water Precautions:\u003c\/strong\u003e Do not expose batteries to high temperatures or any liquids.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAssembly Guidelines:\u003c\/strong\u003e Batteries should only be spot welded; do not solder directly onto battery terminals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eUsers are expected to have battery-handling knowledge before purchasing. By using these batteries, you acknowledge that usage is solely at your own risk, and you take full responsibility for any resulting consequences.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFor Resellers:\u003c\/strong\u003e Please ensure all safety information is passed along to end users to promote safe handling and proper use.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Makita","offers":[{"title":"Default Title","offer_id":42450681856071,"sku":"BL1880-10S21700-BMS-SHELL","price":39.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0588\/8055\/7127\/files\/makita-18v-21700-battery-case-bms-10ah-05.jpg?v=1769909299","url":"https:\/\/diy500amp.com\/products\/21700-plastic-case-bms-pcba-for-makita-18v-li-ion-battery-diy-kit","provider":"DIY500AMP.COM","version":"1.0","type":"link"}