RELIANCE RS50: THE RISING STAR IN HIGH-CURRENT POWER
- 1 hour ago
- 3 min read
If you're looking for a dependable, USA-built eBike battery that delivers strong current, stable voltage, and noticeable performance gains, here’s why the Reliance RS50 is earning its place in our Innovator Series.
What Makes the Reliance RS50 a High-Performance eBike Cell?
The Reliance RS50 (INR21700-RS50) is designed for riders who want a mix of strong acceleration, low voltage sag, and balanced range without the premium price tag of flagship power cells. Its spec sheet speaks for itself:
Capacity: ~5,000 mAh (5.0Ah)
Max Continuous Discharge: Up to 70A
Internal Resistance: ≤ 4 mΩ
Operating Temperature: Discharge from –40°C to ~80°C
Form Factor: 21700 — the modern standard for high-current packs
This combination makes the RS50 ideal for demanding mid-drive systems like CYC, BBSHD Ludi, and other high-amp controllers where consistent power delivery under load truly matters.
Why Bicycle Motor Works Chose the RS50 for Performance and Winter Riding
Unlike low-cost cells with inflated ratings, the RS50 brings real engineering advantages that translate directly into real-world performance for our customers.
1. High Current Handling Without Overheating
With a 70A discharge capability, the RS50 supports sustained load without the heat spikes that shorten cell life. This means better stability during hill climbs, heavy acceleration, and off-road riding.
2. Low Voltage Sag Under Load
Riders feel smoother throttle response, higher sustained speeds, and more consistent torque — especially with powerful mid-drive systems.
3. Strong Cold-Weather Behavior
The RS50’s broad discharge temperature range is ideal for our Winter-Ready Collection, delivering more reliable output during cold morning rides where other cells weaken.
4. Balanced Range + Power
At 5.0Ah per cell, RS50 packs offer excellent watt-hours without sacrificing high-amp capability. This is perfect for daily commuters and performance riders alike.
How Bicycle Motor Works Maximizes RS50 Performance
A great cell is just the beginning — how it’s engineered into a pack makes all the difference. Every RS50 eBike battery built by Bicycle Motor Works includes:
Pure copper busbars for maximum conductivity
High-quality BMS (45A–60A depending on pack)
10–12 AWG silicone leads for low-resistance output
Precision spot welding and assembly in Bethlehem, PA
Sealed, winter-ready encasement options (Traditional, Shark Series, Versa-Fit)
Small-batch quality control for safety and consistency
This ensures every pack not only performs well, but performs reliably for years.
DIVE IN DATA DEEP:
RELIANCE RS50 TEST RESULTS by
BATTERY MOOCH
Obtain the full analysis on the Reliance RS50 cell by renowned battery specialist and cell performance analysis, Battery Mooch. Be sure to reach out and thank him for his great work!
How the RS50 Compares to Other High-End Cells We Use
Bicycle Motor Works builds packs with multiple premium cell types — each chosen for a different performance style. Here’s where the RS50 fits:
Cell | Capacity | Max Current | Best For |
|---|---|---|---|
Reliance RS50 | 5.0ah | 70A | Balanced power, value, winter-riding |
Molicel P45B | 4.5ah | Ultra-High Discharge | Hard-hitting acceleration + torque |
Molicel P50B | 5.0ah | High Energy | Range + power |
Samsung 50S | 5.0ah | Top Tier Consistency | Reliability, long range |
The RS50 sits in the perfect middle ground:
budget-friendly, high-performing, and winter-strong.
Is the RS50 Right for Your Ride?
You’ll love an RS50-powered Bicycle Motor Works battery if you want:
Strong acceleration without voltage sag
Good range for the price
Reliable cold-weather performance
A USA-built, high-current pack designed for real-world riding
A more affordable alternative to premium Molicel or Samsung ultra-power cells
It's ideal for riders who want the most current for their budget.
Final Thoughts: A Smart, Powerful Choice for High-Current eBike Builds
At Bicycle Motor Works, we’re committed to building batteries that are safe, powerful, and engineered with integrity. The Reliance RS50 helps us offer a more accessible high-current option without compromising on performance or winter readiness.
If you're upgrading your eBike, tuning a mid-drive system, or looking for a dependable cold-weather pack, an RS50-based build is an exceptional choice.
Innovator Series
Explore the entire collection, featuring Reliance RS50 and other select high-performance series.
