• Black battery box with 40 cells for a Polly 4C battery system on a white background.
  • Black storage box with compartments and keys on a white background, featuring the brand 'ChamRider'.
  • Technical drawing of a product with dimensions labeled, featuring the brand 'ChamRider'.
  • Black electronic device with 'Push Back' instruction on a white background, featuring ChamRider branding.
  • ChamRider product with safe lock, power indicator, charging port/switch, and 4 pins features.
  • Bicycle with a black battery pack attached, featuring the brand 'Hinuera'.
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Ebike Power Network

Battery Box for Electric Bike, Battery Case

Battery Box for Electric Bike, Battery Case

$87.94 USD
$47.94 USD $87.94 USD
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Chamrider Custom Downtube E-Bike Battery Case Enclosure Kit –

Heavy-Duty DIY Housing with Precision Nickel Strips for 21700 Cell 10S4P (36V) & 13S3P (48V) Builds

Build your own high-output, professional-grade electric bicycle battery pack with total confidence. The Chamrider Downtube E-Bike Battery Case Kit is an empty, heavy-duty battery housing engineered specifically for custom cell builders, fleet technicians, and DIY e-bike enthusiasts using high-energy density 21700 lithium-ion cells. Precision-molded to mount cleanly onto standard frame water bottle bosses, this enclosure accommodates popular configuration layouts including 10S4P (36V nominal) and 13S3P (48V nominal).

Complete with custom-cut, high-conductivity nickel strips, structural cell spacers, an integrated mechanical lock keyway, and an external LED power level indicator, this kit gives you all the core structural hardware needed to assemble a clean, reliable downtube battery pack.

🚀 Key High-Performance Features

  • Optimized for 21700 Lithium Cells: Precision interior dimensioning designed specifically to house high-capacity 21700 battery cells without tight squeezing or loose rattle.

  • Versatile Circuit Topology Support: Perfect for building high-efficiency 36V (10S4P - 40 cells) or 48V (13S3P - 39 cells) custom power packs tailored to your motor setup.

  • Precision Pre-Cut Nickel Strips Included: Comes complete with low-resistance nickel connection strips designed to streamline spot-welding and optimize high-current discharge.

  • Rugged Impact-Resistant ABS Shell: Engineered with a thick, shock-absorbing polymer casing that protects internal cells from trail vibrations, gravel strikes, and weather exposure.

  • Integrated Locking Mounting Rail: Features a secure frame-mounting baseplate with dual key locking mechanism to keep your battery locked tight to the frame and prevent theft.

  • Built-in Charge Port & LED Battery Indicator: Pre-molded cutouts for standard charging jacks, key switches, and a multi-segment LED state-of-charge readout.

📊 Hardware Specifications & Architecture Blueprint

Verify your configuration needs before starting your custom battery assembly:







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