⚡ Bicycle Motor Works —52v 20ah Ampace JP50 Winter-Ready eBike Battery
 
Introducing the next evolution in high-output American-built eBike batteries — the Winter-Ready eBike Battery Ampace JP50 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 Winter-Ready JP50 Series is powered by genuine Ampace INR21700-RS50 cells — advanced high-drain lithium-ion cells that deliver an incredible 5,000 mAh capacity and up to 60 A continuous discharge. The JP50 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: • 52V 20Ah (14S 4P) — 12.25 × 4 × 3 in • Traditional Encasement
 
⚙️ Ampace JP50 Cell Highlights
True 5,000 mAh nominal capacity (≥ 4,950 mAh minimum) for extended range and endurance
60 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 Ampace JP50?
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 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.