{"product_id":"polly-dp9-diy-ebike-battery-case-91-cells","title":"DP-9 Downtube DIY E-Bike Battery Case Kit.","description":"\u003ch1\u003ePolly DP-9 DIY Downtube E-Bike Battery Case \u0026amp; Enclosure Kit (Holds Up to 91x 18650 Cells) – Universal Aluminum Alloy Shell with Cell Holders, DC Charging Port \u0026amp; Key Lock Mount\u003c\/h1\u003e\n\u003cp\u003eBuild or re-case a custom high-capacity e-bike power pack with the \u003cb\u003ePolly DP-9 Downtube DIY E-Bike Battery Case Kit\u003c\/b\u003e. Designed specifically for custom lithium battery builders, off-road e-bike upgrades, and DIY battery repairs, this empty casing accommodates \u003cb\u003eup to 91 individual 18650 cells\u003c\/b\u003e (such as 10S9P for 36V, 13S7P for 48V, or 14S6P for 52V pack configurations).\u003c\/p\u003e\n\u003cp\u003eConstructed from a lightweight yet durable combination of \u003cb\u003eextruded aluminum alloy and impact-resistant ABS plastic\u003c\/b\u003e, the Polly DP-9 mounts securely to standard water bottle boss threads on your bike frame. Featuring a \u003cb\u003estandard DC charging socket, built-in power switch interface, and dual-key anti-theft locking mechanism\u003c\/b\u003e, this case provides a professional factory appearance for your custom battery build.\u003c\/p\u003e\n\u003ch3\u003e⚠️ Important Product Notice \u0026amp; Compatibility Information\u003c\/h3\u003e\n\u003cblockquote\u003e\n\u003cp\u003e\u003cb\u003eTHIS IS AN EMPTY CASING KIT (DIY HARDWARE ONLY):\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eNO BATTERY CELLS INCLUDED:\u003c\/b\u003e This product contains \u003cb\u003eonly the physical enclosure, inner cell matrix brackets, key lock, and base rail\u003c\/b\u003e. It does \u003ci\u003enot\u003c\/i\u003e include lithium-ion battery cells, BMS protection boards, or wiring assemblies.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eDimensions Check:\u003c\/b\u003e Overall outer case dimensions measure \u003cb\u003e370mm x 90mm x 140mm\u003c\/b\u003e. Please verify frame clearance inside your bike's front triangle before ordering.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/blockquote\u003e\n\u003ch3\u003e🚴 Perfect for Custom DIY Pack Builds\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e36V Systems:\u003c\/b\u003e Build up to a massive 10S9P cell configuration for maximum amp-hour capacity.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e48V Systems:\u003c\/b\u003e Build up to a high-capacity 13S7P pack configuration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003e52V Systems:\u003c\/b\u003e Build up to a high-voltage 14S6P pack configuration.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e🚀 Key High-Performance Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eExpanded 91-Cell Capacity:\u003c\/b\u003e Maximize your energy density with internal cell holder grids designed to cleanly isolate and lock up to 91x 18650 cells into position.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eAluminum Alloy \u0026amp; ABS Enclosure:\u003c\/b\u003e Extruded aluminum side walls combined with high-grade polymer end caps shield your custom pack against frame vibration, road debris, and impact.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eUniversal Downtube Base Rail Mount:\u003c\/b\u003e Fits directly onto standard frame water bottle mounting holes for balanced center-of-gravity weight distribution.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eIntegrated Key Lock Security:\u003c\/b\u003e Includes an integrated steel locking mechanism with 2 physical safety keys to prevent theft when parked.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eDC Charging Socket Port:\u003c\/b\u003e Standardized DC charging port interface simplifies connection to dedicated lithium-ion chargers.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e📊 Technical Specifications Matrix\u003c\/h3\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSpecification Parameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003ePolly DP-9 DIY Case Specifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eProduct Type\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eDIY E-Bike Battery Shell \/ Case (Empty Casing)\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eModel Designation\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePolly DP-9 (Downtube Style)\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eMax Cell Capacity\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eUp to 91x 18650 Cells\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003ePhysical Outer Dimensions\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003e370 mm x 90 mm x 140 mm\u003c\/b\u003e (14.5\" L x 3.5\" W x 5.5\" H)\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eEnclosure Materials\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eExtruded Aluminum Alloy + Industrial ABS Plastic\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eSupported Pack Voltages\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003e36V, 48V, or 52V Custom Assemblies\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eCharging Socket Format\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eStandard DC Female Connector Port\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eMounting Hardware\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eDowntube Locking Base Rail Interface\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eProduct Color\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003eMatte Black Finish\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003e\u003cb\u003eHazardous Chemical Registry\u003c\/b\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e\u003ccode\u003eHigh-concerned chemical: None\u003c\/code\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch1\u003e\u003c\/h1\u003e\n\u003ch3\u003e⚙️ Assembly \u0026amp; Building Guidelines\u003c\/h3\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eCell Matrix Arrangement:\u003c\/b\u003e Spot-weld your 18650 cells into series\/parallel groups using the included internal spacer holders to maintain safety air gaps.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eBMS Wiring \u0026amp; Insulation:\u003c\/b\u003e Install your Smart BMS protection board, ensure all balance leads are properly insulated, and fit protective fish-paper insulation inside the aluminum shell.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cb\u003eClosing \u0026amp; Mounting:\u003c\/b\u003e Secure the outer end caps using screws, mount the base rail onto your e-bike frame, slide the completed case onto the rail, and lock with the key.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003ch3\u003e📦 Package Contents\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e1 x Polly DP-9 Empty E-Bike Battery Case (Black)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1 x Internal 18650 Cell Matrix Spacer Set (Up to 91 Cells)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e1 x Downtube Base Mounting Rail\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e2 x Anti-Theft Lock Keys\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eBuild your custom high-capacity e-bike pack today. Select your kit quantity below, click Add to Cart, and start building!\u003c\/b\u003e\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S96786576729440799588d8f3ef743f26Z.png\" alt=\"Polly DP-9 empty ebike battery case shell holding up to 91 18650 cells\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S164e5e0bb62247e29b928cf6abb090f78.png\" alt=\"Polly DP-9 empty ebike battery case shell holding up to 91 18650 cells\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sb0d7a2f6bb3442b4b81019b70eecd77cC.png\" alt=\"Polly DP-9 empty ebike battery case shell holding up to 91 18650 cells\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/Sd944ccb8697240f792ce8c45a9e05ad4r.png\" alt=\"Polly DP-9 empty ebike battery case shell holding up to 91 18650 cells\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S4e109ea27bcc44d1bdec736a095b79bfr.png\" alt=\"Polly DP-9 empty ebike battery case shell holding up to 91 18650 cells\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e\n\u003ch1\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S6d01696d6ea74a8cb366fe15a1a64340A.png\" style=\"font-size: 0.875rem;\"\u003e\u003c\/h1\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/ae01.alicdn.com\/kf\/S855c63b4a4624a988ebd855417e19aaf6.png\" alt=\"Polly DP-9 empty ebike battery case shell holding up to 91 18650 cells\" style=\"margin-bottom: 16px; float: none;\"\u003e\u003c\/div\u003e","brand":"Ebike Power Network","offers":[{"title":"52V Case","offer_id":47396604936363,"sku":"14:200006156#52V Case","price":60.89,"currency_code":"USD","in_stock":true},{"title":"48V Case","offer_id":47396604969131,"sku":"14:200006152#48V Case","price":60.76,"currency_code":"USD","in_stock":true},{"title":"36V Case","offer_id":47396605001899,"sku":"14:200006151#36V Case","price":60.26,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/2649\/7451\/files\/S83c175f97cf542129d48d33a95d978a3v.webp?v=1784073550","url":"https:\/\/chargemyebike.com\/products\/polly-dp9-diy-ebike-battery-case-91-cells","provider":"Ebike Power Network","version":"1.0","type":"link"}