Reention Dorado 21700 Semi-Hidden E-Bike Battery Replacement Shell & Upgrade Case (36V / 48V / 52V) – Extended Range Case with Cell Spacers

Upgrade your e-bike's energy storage capacity with the heavy-duty Reention Dorado 21700 Semi-Hidden Battery Enclosure Kit. Engineered specifically for custom battery builders, repair technicians, and e-bike owners looking to build high-capacity lithium packs, this replacement case fits high-density 21700 lithium-ion cells to deliver significantly higher amp-hour (Ah) ratings than standard 18650 builds.

This versatile battery housing is designed for seamless integration into semi-hidden downtube frame slots. It serves as a direct replacement or extended-capacity upgrade for bikes equipped with Reention Dorado Max, Plus, Pro, and Mini battery profiles (provided your frame's internal clearance matches the casing length).

🚀 Key High-Performance Features

• High-Density 21700 Cell Compatibility: Designed to hold larger 21700 format cells, allowing you to build higher amp-hour (Ah) capacity packs for extended riding range and improved high-drain performance.

• Universal Reention Dorado Upgrade Path: Backwards compatible with Reention Dorado Plus, Max, Pro, and Mini frame mounts (check frame length clearance to fit the 458mm extended shell).

• Complete Precision Cell Holder Assembly: Includes custom-molded 21700 cell spacer grids to ensure proper thermal dissipation, structural alignment, and vibration resistance for off-road and city riding.

• Multiple Voltage & Length Options: Available in 394mm (52-cell capacity) and 458mm (65-cell capacity) configurations for 36V, 48V, and 52V battery architectures.

• Integrated Power Indicator: Features built-in LED voltage level monitoring calibrated for 36V, 48V, or 52V pack setups to give you quick battery capacity status.

• Semi-Hidden Frame Integration: Retains a clean, aerodynamic downtube profile while protecting internal cells and BMS electronics from dust, moisture, and road debris.

📊 Technical Specifications & Sizing Matrix

Choose the appropriate casing length and cell capacity based on your bike frame dimensions and desired voltage/series configuration: 

⚙️ Assembly & Frame Fitting Guidelines

1. Frame Clearance Measurement: Before ordering an extended 458mm length shell to upgrade a Dorado Mini or Plus, measure your frame's inner downtube battery channel to ensure an extra-long casing can slide into position without obstruction.

2. Cell Arrangement: Use the included 21700 cell spacer grids to group your series and parallel cell combinations (10S5P for 36V; 13S5P for 48V; 14S4P for 52V setups).

3. BMS & Wiring Placement: Reserve space inside the end-cap sections for your Battery Management System (BMS) wiring harness, charge port lead, and main discharge cables.

📦 What's Inside the Box?

• 1 x Reention Dorado 21700 E-Bike Battery Enclosure (Matte Black)

• 1 x Internal 21700 Cell Holder / Spacer Grid Set (52-Piece or 65-Piece based on size selection)

• 1 x Integrated LED Power Indicator Panel Assembly

Maximize your e-bike's range and build custom high-output 21700 battery packs. Select your case length and voltage indicator below, click Add to Cart, and start your battery build today!