72V 13.5Ah Molicel P45B eBike Battery
Premium, High-Current Power. Built in the USA. Engineered for Mid-Drive Performance.
Meet the next evolution in high-power eBike energy. The Bicycle Motor Works 72V 13.5Ah Molicel P45B Battery is purpose-built for riders running high-current mid-drive systems who demand unmatched torque, acceleration, and thermal stability. Featuring an all-new, rugged design and packed with 60 genuine Molicel P45B 21700 cells, this pack delivers real-world performance you can feel—from mountain climbs to high-speed straightaways.
This is premium power, handcrafted in Bethlehem, PA, protected, sealed, and built for riders who expect their battery to be as tough as their terrain.
 
Key Performance Features
90A Continuous / 120A Burst BMS
High-current Bluetooth-ready BMS built for serious power delivery, temperature protection, and stable cell balancing.
🔋 Molicel P45B – 3P High-Output Cell Configuration
Each cell is rated for 45A continuous, giving this 20s3p pack an incredible 135A continuous potential (your controller will pull only what it needs).
🇺🇸 Built in the USA — Protected & Safely Sealed
Custom-built, tested, and professionally assembled with industrial-grade materials.
🏆 The Ultra High Power Cell
Molicel’s P45B has become a gold standard for high-current applications—proven by independent testers (Mooch, Pajda) for consistency, voltage retention, and low internal resistance.
 
Technical Specifications
Voltage: 72V
Capacity: 13.5Ah
Energy: 972Wh
Configuration: 20s3p
Cells: 60 Genuine Molicel P45B 21700 (4500mAh / 45A)
BMS: 90A continuous • 120A max burst
Discharge Connector: XT-90S anti-spark
Charge Connector: Heavy-duty XT-60
Weight: Approx. 11.25 lb
Dimensions: 13.75” × 3.75” × 3.25”
Encasement: Thick, rigid internal structure with double shrink wrap + rugged rubber armor
 
 
Design Highlights
Engineered for Heat Dissipation
This pack uses a tight internal structure for improved thermal transfer. Large empty air gaps act as insulators—our design prevents that, allowing heat to naturally move outward for better performance during high-load riding.
 
Built for Backpacks or Frames
Compact enough for most frames and durable enough for daily use.
 
Industrial-Grade Connections
Solid nickel and copper busbars, precision spot-welded for maximum conductivity and reliability.
Every series is tested before assembly, ensuring a stable and balanced pack from the start.
Why 72V?
Because 72V = instant responsiveness.
You get:
Faster acceleration
Better hill-climb capability
Higher sustained power
Reduced amp draw for the same watt output (less stress on the system)
More voltage = more efficiency.
 
 
Safety First — Important Warning
Lithium-ion batteries are powerful devices and must be handled responsibly.
Never short-circuit the battery.
Charge ONLY with a compatible lithium-ion charger.
Never leave a charging battery unattended.
Charge in a fire-safe location (BBQ grill, ammo box, or metal enclosure recommended).
Do not use the battery if it becomes damaged or wet.
Do not modify or open the pack—this voids all warranties and can be dangerous.
If you’re unsure which charger or setup you need, contact us. We’re here to help.
 
Shipping Information
All Bicycle Motor Works batteries are built to order and ship in the order received.
Please allow 5–10 business days for assembly and shipment.
Tracking is provided as soon as your order ships.
 
 
Need Guidance?
If you’re unsure about compatibility, configuration, or charging equipment, reach out to our team. Lithium-ion packs offer incredible power but must be used correctly—we’re always here to support you.