How to Choose the Right Battery for the CYC Photon Pro
- 1 hour ago
- 6 min read
The CYC Photon Pro brings serious performance to the mid-drive category, with up to 4,000 watts of peak power, 180 N·m of torque, and compatibility with battery systems from 36V to 72V.
But a high-performance motor is only one part of the system.
Choosing the right battery can dramatically affect how your bike feels -
how much it weighs, where the battery fits, how far you can ride, and how much power is available when you accelerate or climb.
At Bicycle Motor Works, we offer several battery configurations designed to let you build your Photon Pro around the way you actually ride.
Whether you're building a lightweight trail bike, a powerful off-road machine, or a long-range commuter, here is how to choose the right battery.
52V or 72V: Which Voltage Should You Choose?
The first decision is voltage.
52V = Balanced Performance
A 52V battery is an excellent choice for riders who want strong, responsive performance without adding unnecessary size or weight.
A 52V Photon Pro setup is well suited for everyday riding, trail riding, technical builds, and riders who want a balance between power, efficiency, range, and maneuverability.
Think of 52V as the performance all-rounder.
It delivers plenty of capability while making it easier to create a lighter, cleaner, and more versatile bike.
72V = Maximum Performance Potential
Step up to 72V when you're building around higher performance.
A 72V system is ideal for riders looking for stronger acceleration, greater high-voltage power potential, and a more aggressive Photon Pro setup.
For steep climbs, demanding off-road riding, heavier builds, or riders who simply want to take advantage of the Photon Pro's higher-voltage capabilities, 72V becomes the natural choice.
At the same amp-hour capacity, a 72V battery also stores more energy than a 52V battery, giving builders another way to increase the energy available to the system.
In simple terms:
52V = Balanced, lighter and versatile.72V = More aggressive, higher-voltage performance.
Next Question: Lightweight or Extended Range?
Voltage isn't the only decision.
The next question is how you plan to use your bike.
Some riders want the largest practical battery and maximum riding range. Others would rather carry less battery, reduce weight, and maintain the agility of the bike.
Neither approach is better—they are built for different riders.
Higher-Capacity Locking Batteries
For commuting, city riding, longer adventures, and extended-range builds, consider a higher-capacity battery in our locking Shark Series encasement.
The locking mount keeps the battery securely attached to the bike while allowing it to be removed when needed.
This configuration makes sense for riders who prioritize:
Longer riding range, everyday transportation, secure frame mounting, fewer charging stops, and extended adventures.
If your bike is transportation as much as recreation, carrying additional battery capacity is often worth the additional size and weight.
Lower-Capacity, Lightweight Batteries
For trail riders and performance-focused builds, carrying the largest possible battery isn't always the goal.
A lower-capacity battery can significantly reduce the size and weight of the system while still providing serious power.
These batteries are ideal for riders who prioritize agility, versatility, easier mounting, and a lighter overall bike.
For technical trails, compact frames, and performance builds where every pound matters, smaller can actually be better.
VersaFit or TrimLine?
Once you've decided how much battery you want to carry, the next consideration is where the battery needs to fit.
That's where our VersaFit and TrimLine designs come in.
VersaFit: Compact and Versatile
The VersaFit was designed around flexibility.
Its compact form makes it easier to integrate a high-performance battery into a wide variety of bike frames and custom builds without committing to a large traditional locking enclosure.
For riders who frequently work with tight frame geometry, full-suspension bikes, custom mounting locations, or trail-focused builds, VersaFit provides significantly more freedom.
TrimLine: VersaFit Versatility in an Even Smaller Footprint
The TrimLine takes the VersaFit concept one step further.
You get the same performance-focused versatility, but in an even smaller footprint designed specifically for space-conscious builds.
TrimLine is ideal when frame space is at a premium or when you're trying to create a particularly clean, compact installation.
Think of the difference this way:
VersaFit = Compact + VersatileTrimLine = Compact + Versatile + Minimum Footprint
If you're staring at your frame wondering how you're going to fit a serious battery into a very small space, start with TrimLine.
Ampace JP50 or Reliance RS50?
Now we get to the heart of the battery: the cells themselves.
For our highest-performance Photon Pro battery configurations, two of the most exciting options are the Ampace JP50 and Reliance RS50.
Both are premium 5.0Ah 21700 high-current lithium-ion cells designed for applications where conventional energy-focused cells may not provide the performance riders are looking for.
But there is a difference.
Ampace JP50: High Current Meets All-Around Performance
The Ampace JP50 is an excellent choice for riders looking for a combination of high-current capability, strong power delivery, thermal performance, and all-season versatility.
With a cell-level continuous discharge rating of up to 60A, the JP50 is designed for demanding applications while still providing 5.0Ah of capacity per cell.
That combination makes the JP50 particularly attractive for riders who want a battery capable of supporting demanding acceleration and climbing while maintaining useful energy density.
It is an excellent high-performance all-rounder.
Reliance RS50: Step Up the Current Capability
The Reliance RS50 moves even further toward high-current performance.
The RS50 also provides 5.0Ah capacity per cell, but with a cell-level continuous discharge capability of up to 70A.
That makes it especially attractive for riders building around demanding acceleration, steep climbs, high loads, and high-output systems.
If your priority is extracting the greatest current capability from a 5Ah cell platform, the RS50 becomes the performance-focused choice.
The simple comparison:
Ampace JP50 → High current + excellent all-around performanceReliance RS50 → Higher current capability + demanding performance builds
Both are serious cells. Your decision comes down to how aggressively you intend to use the
system.
Build the Battery Around the Bike—Not the Other Way Around
One of the biggest mistakes in building a high-performance eBike is choosing a battery based entirely on the largest voltage or capacity available.
A better approach is to build the battery around the bike and the way you ride.
A lightweight trail rider may be happier with a compact 52V VersaFit or TrimLine configuration.
A rider looking for higher-voltage performance without carrying a large enclosure might prefer a 72V VersaFit.
A commuter or adventure rider who prioritizes range and secure mounting may prefer a higher-capacity locking Shark Series battery.
And riders pushing their systems harder can choose between Ampace JP50 and Reliance RS50 high-current cells based on their performance priorities.
That's why we don't believe there is one "best" eBike battery.
There is a best battery for your build.
Power the Photon Pro Your Way
The Photon Pro gives builders something extremely valuable: choice.
You can build around 52V or 72V. You can prioritize lightweight performance or extended range. You can choose a traditional locking system, a versatile VersaFit configuration, or an ultra-compact TrimLine design. And you can select between some of today's most capable high-current 21700 cells.
The result is a power system designed around your bike, your terrain, and your riding style.
Use the Bicycle Motor Works Battery Selector to configure the right battery for your Photon Pro build.
Photon Pro Has the Power. Give it the Battery to Match.
52V or 72V. VersaFit, TrimLine or Locking. Ampace JP50 or Reliance RS50.
Build your system. Power your ride.
CYC Motor Photon Pro Battery FAQ
Can the CYC Photon Pro use a 72V battery?
Yes. The Photon Pro is designed for battery systems from 36V through 72V.
Should I use 52V or 72V with the Photon Pro?
Choose 52V for a lighter, balanced performance build. Choose 72V when your priority is higher-voltage performance and greater power potential.
What is the difference between VersaFit and TrimLine?
VersaFit provides compact, flexible battery placement across a wide variety of builds. TrimLine follows the same concept in an even smaller footprint for bikes with limited mounting space.
What is the difference between Ampace JP50 and Reliance RS50?
Both are 5Ah high-current 21700 cells. The JP50 offers strong all-around high-current performance, while the RS50 provides a higher published cell-level continuous discharge rating for more demanding builds.
Should I choose a locking battery or a lightweight battery?
A locking, higher-capacity battery is generally better for commuting and extended rides. A lower-capacity VersaFit or TrimLine battery is better when reduced weight, agility, and flexible mounting matter more.
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