⚡ Bicycle Motor Works — 72v 15ah Reliance RS50 Innovator eBike Battery Power Series
 
Introducing the next evolution in high-output American-built eBike batteries — the Innovator Reliance RS50 Series.
 
Precision-engineered in Bethlehem, Pennsylvania, this line embodies the perfect union of raw current capability, thermal stability, and engineering excellence.
 
Each pack in the Innovator RS50 Series is powered by genuine Reliance INR21700-RS50 cells — advanced high-drain lithium-ion cells that deliver an incredible 5,000 mAh capacity and up to 70 A continuous discharge. The RS50 represents the future of compact, high-power energy systems — designed for riders and builders who push the limits of performance, endurance, and reliability.
 
🔋 This Model: 72V 15Ah (20S 3P) — 13.75 × 3 × 3.75 in • Traditional Encasement
 
⚙️ Reliance RS50 Cell Highlights
True 5,000 mAh nominal capacity (≥ 4,950 mAh minimum) for extended range and endurance
70 A continuous discharge capability — delivering serious current for demanding eBike systems
Ultra-low internal resistance (≤ 4 mΩ) for efficient current transfer and minimal heat buildup
Wide operating range from –40 °C to +80 °C for four-season reliability
Tabless high-rate design enhances conductivity, reduces heat, and improves cycle longevity
3.6 V nominal / 4.2 V max charge voltage — standard lithium-ion architecture for compatibility
High energy density (~5 Ah per cell) within the lightweight 21700 format (~67 g per cell)
Long cycle life (~600 cycles @ 80% DOD retaining ≥ 60% capacity)
Certified & traceable: UN38.3 / UL1642 / IEC62133 compliant
Designed for ultra-high-drain applications — ideal for performance eBikes, light EVs, and power tools
 
 
💡 Why Choose the Innovator Reliance RS50 Series
Exceptional torque delivery and sustained power for high-performance eBike systems
Cooler operation and minimal voltage sag under heavy acceleration or long climbs
Reliable all-weather performance with superior temperature tolerance
Precision-built in limited runs using pure copper busbars and advanced high-discharge BMS
Designed for builders, commuters, and performance enthusiasts who demand dependable power
 
 
🧠 Innovative Power. American Precision.
Every Innovator Series pack is hand-crafted in Bethlehem, Pennsylvania, where advanced engineering meets American craftsmanship.
 
Designed for performance commuters, off-road riders, and custom EV projects, these batteries embody Bicycle Motor Works’ enduring commitment to power, integrity, and innovation.
 
Innovative Power. Crafted for Performance.
Only from Bicycle Motor Works — The Original American eBike Battery Manufacturer.
 
 
⚠️ Safety Guidelines
Please read our eBike Battery 101 Guide before use. Lithium-ion batteries must be handled with care.
Always:
Charge with the correct lithium-ion charger
Charge in a fireproof or metal container
Store in a cool, dry environment
Never:
Modify connectors or wiring
Charge unattended or near flammables
Use if damaged or wet
Improper handling can cause fire or injury — consult a professional if unsure.
 
🚚 Shipping Information
Built to order in Bethlehem, PA
Ships within 6 – 10 business days
Tracking provided upon shipment
U.S.-based support available
 
 
🏆 Why Choose Bicycle Motor Works
🇺🇸 Proudly Built in the USA Since 2014
👨‍🔧 Family-Owned & Operated
🔋 Certified 21700 Cells Only – No Rewraps or Recycled Cells
⚙️ Copper Busbar Engineering for Maximum Efficiency
🚴 Trusted by eBike Builders & Riders Nationwide
 
Bicycle Motor Works – Premium American-Made eBike Batteries.
Engineered for Power. Built to Last.