The Original Pocket Rocket II – Premium Compact 52V eBike Battery Built in the U.S.A. | Samsung 40T Cells | Lightweight Powerhouse | Exclusive by Bicycle Motor Works Featuring New Upgrade Option: Active 100 Balance Bluetooth BMS Technology Monitor your eBike battery directly from your smartphone with the free 100 Balance app. View real-time metrics such as: - Voltage - Current Temperature - State of charge (SOC) Active balance technology keeps your battery cells evenly balanced — even if not charged to 100%. This extends battery life, optimizes performance, and ensures consistent power delivery under heavy load. Engineered for riders who want serious performance in a compact package, the Pocket Rocket is your ultimate plug-and-play power upgrade — delivering more speed, range, and torque for 48V systems. Meet the Pocket Rocket II, the legendary eBike battery that helped launch Bicycle Motor Works into the spotlight. Don’t let its small size fool you — this compact powerhouse delivers 52 volts of high-current performance using Samsung 40T 21700 cells, trusted by riders for their unmatched balance of power, reliability, and thermal stability. Whether you’re tackling short, punchy rides or carrying a backup for long adventures, the Pocket Rocket II is built to perform — lightweight, rugged, and efficient. Key Features - 52V 8Ah (416Wh) – Compact power upgrade for any 48V system - Samsung 40T 21700 Cells – Premium Grade-A, high-current cells - 45A Continuous / 100A Max BMS – Smart protection with temperature monitoring - 14S2P Configuration (28 Cells) – Balanced performance and stability - Plug-and-Play – Compatible with all 48V motors and controllers - Lightweight Build – Just under 5 lbs, fits tight spaces and compact frames - XT-90S Output Connector (no sparks) and XT-60 Charging Port - Built in the U.S.A. – Designed, tested, and assembled in Bethlehem, Pennsylvania Technical Specifications - Voltage: 52V (compatible with 48V setups) - Capacity: 8Ah (416Wh) - Configuration: 14s2p - BMS: 45A continuous / 100A max, temperature protected - Cells: 28 Genuine Samsung 40T 21700 cells - Connectors: XT-90S discharge | XT-60 charge - Dimensions: 4” × 6” × 3” - Weight: ~5 lbs - Cycle Life: 400–1000 charge cycles Performance & Design The Pocket Rocket II provides a safe and simple power boost for your 48V system — giving you more speed, range, and torque without modification. Its compact, tight-frame design enhances heat dissipation, preventing trapped heat that reduces performance. Connections are made with solid nickel strips, precision spot-welded to every cell for low resistance and stable energy transfer. You’ll notice: - Less voltage sag under load - Cooler, more consistent operation - Improved throttle response and overall ride efficiency Built for Safety and Reliability Every pack undergoes rigorous testing before shipment. The advanced Battery Management System (BMS) ensures: - Overcharge / over-discharge protection - Cell balancing for long-term efficiency - Thermal monitoring for stability and safety Each pack is sealed, protected, and optimized for performance — because your power source should be as reliable as your ride. Safety & Handling Lithium-ion batteries must be charged and handled with care. Always charge in a fire-safe area (metal box or BBQ grill enclosure recommended) and never leave unattended. Do Not: - Modify wiring or connectors - Charge near flammable materials - Continue use if damaged or wet - Use an incompatible charger If the pack becomes damaged or exposed to water, contact your local hazardous waste facility for safe disposal. Read our eBike Battery 101 Guide and Terms & Conditions before purchase. Shipping Information All batteries are built to order and shipped in the order received. - Standard lead time: 5–10 business days - Tracking provided once shipped - U.S.-based support available for any assistance Why Choose Bicycle Motor Works - American-Made eBike Batteries since 2014 - Genuine Samsung 21700 Cells – never rewrapped or recycled - Overbuilt for Power and Safety – copper/nickel connections, smart BMS - Responsive U.S. Customer Support – real riders, real expertise The Pocket Rocket II – Small in size, huge in performance. Bicycle Motor Works: Premium American-Made Power for Serious Riders.