⚡ 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
 
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.