Ampace JP40 & JP50: Next-Generation High-Power Cells for eBike Performance
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- 3 min read
As eBike performance continues to evolve, the demand for higher power output, faster charging, and longer cycle life has pushed battery technology forward. One of the newest and most disruptive entrants in this space is Ampace, a battery manufacturer backed by industry giants and rapidly gaining attention for its JP (Jumbo Power) series cells.
At Bicycle Motor Works, selecting the right cell chemistry and architecture is critical. In this article, we break down Ampace as a company, and take a deep dive into the JP40 and JP50 cells, analyzing how they compare and where they fit into high-performance eBike systems.
Who Is Ampace?
Ampace (新能安) is a battery technology company founded in 2021 as a joint venture between CATL and ATL, two of the largest lithium-ion battery manufacturers in the world.
This pedigree matters.
CATL is the world’s largest EV battery manufacturer
ATL dominates lithium-ion batteries in consumer electronics
Ampace combines both backgrounds, focusing on:
Micro-mobility (e-bikes, scooters)
Power tools
Robotics and energy storage systems
Their goal is simple:push cylindrical lithium-ion cells to higher power, faster charge rates, and better thermal stability.
The Jumbo Power (JP) Series: What Makes It Different?
Ampace introduced the JP series to address a major limitation in traditional cylindrical cells:👉 balancing power vs. heat vs. lifespan
The JP platform integrates:
Advanced cathode materials (high energy density)
Silicon-carbon / fast-charge graphite anodes
High-rate electrolyte systems
Tabless (full-tab) architecture
This combination enables:
Higher discharge currents
Reduced internal resistance
Lower temperature rise under load
Faster charging speeds
Ampace JP40: A True High-Discharge Power Cell
The JP40 is one of the most powerful 21700 cells currently available for high-load applications like eBikes.
Key Specifications (JP40)
Capacity: 4000mAh (4.0Ah)
Nominal Voltage: 3.7V
Energy: ~14.4–14.8Wh
Continuous Discharge: 60A (up to 70A with thermal cutoff)
Pulse Discharge: 140A (5 seconds)
Charge Rate: Up to 8A (2C)
Energy Density: ~215 Wh/kg
What Makes JP40 Unique?
1. Extreme Power Density
The JP40 delivers over 3000 W/kg power density, placing it among the highest power cylindrical cells tested.
For eBike applications, this translates to:
Strong acceleration
Minimal voltage sag under load
Better performance with high-wattage motors
2. Tabless Cell Architecture
The JP40 uses a tabless design, reducing internal resistance and heat buildup.
Compared to traditional tabbed cells:
Current flows more evenly
Heat distribution improves
Efficiency increases under high load
3. Fast Charging Capability
Ampace reports 80% charge in ~20 minutes under optimized conditions.
This is a major advantage for:
Delivery riders
Commuters
High-usage riders
4. Cycle Life
~600 cycles to ~80% capacity depending on load
That’s competitive for a cell delivering this level of power.
Ampace JP50: Higher Capacity, Balanced Power
While the JP40 is optimized for maximum discharge, the JP50 shifts toward higher capacity with strong power capability.
Key Known Specs (JP50)
Continuous Discharge: ~50A
Pulse Discharge: 180A (5 seconds)
Fast Charging: 15A ultra-fast charge
Cycle Life: 600+ cycles (>80% SOH)
Temperature Range: -20°C to 80°C operation
What This Means
The JP50 is designed to:
Provide longer range (higher capacity class)
Still deliver high discharge performance
Improve charging speed even further
It sits in a similar category to:
Samsung 50S
Molicel P50B
But with:👉 more aggressive fast-charging capability
JP40 vs JP50 for eBike Applications
Feature | JP40 | JP50 |
Capacity | 4.0Ah | ~5.0Ah class |
Continuous Discharge | ~60A | ~50A |
Pulse Discharge | 140A | 180A |
Charging Speed | 8A | up to 15A |
Use Case | Max power builds | Range + power balance |
Real-World Interpretation
JP40 = Performance Cell
Best for high-watt builds (1500W–5000W+)
Ideal for aggressive riders
Minimal voltage sag
JP50 = Balanced Cell
Better for longer range
Still handles high power loads
Faster recharge potential
Why Ampace Matters for eBike Batteries
Ampace is pushing three major advancements that matter for riders:
1. Higher Power Without Sacrificing Lifespan
Traditionally:
High power = short life
Ampace improves both simultaneously.
2. Faster Charging is Becoming Standard
Fast charging is no longer experimental—it’s becoming expected.
3. Tabless Technology is the Future
The shift to tabless cylindrical cells mirrors what Tesla did with the 4680:
Lower resistance
Better thermal performance
Higher efficiency
What This Means for Bicycle Motor Works
For a company focused on high-performance eBike battery systems, Ampace cells open new possibilities:
JP40 Packs
Maximum output builds
Performance-oriented riders
Off-road / high torque setups
JP50 Packs
Long-range commuters
Balanced performance builds
Riders needing fast recharge cycles
Final Thoughts
Ampace is not just another cell manufacturer—it represents a next wave of lithium-ion innovation, combining:
Proven industry backing (CATL + ATL)
Advanced materials engineering
Tabless architecture
High-rate performance capabilities
The JP40 and JP50 are early indicators of where the industry is heading:
👉 Higher power, faster charging, better thermal control—all in a 21700 form factor.
For Bicycle Motor Works, integrating these cells strategically can unlock:
Higher performance product lines
Faster charging battery systems
Competitive differentiation in the eBike market
Contact us for assistance. We'd be happy to talk batteries with you.
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