Pocket Rocket II 52v 8ah Samsung 40T Lithium ion E-Bike Battery

⚡ 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.