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.