Which Battery Do You Need for Your FluxJet?
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One of the most frequent inquiries from the FluxJet community is: "Which battery should I buy?" It is a critical question. Unlike traditional kayaks, the FluxJet is a high-performance vessel that requires a specific power source to reach its engineering potential. Choosing the wrong setup leads to either inefficient overspending or underwhelming performance on the water.
Here is the data you need to make an informed decision.
The Short Answer: We Recommend 36V
If you want the full FluxJet experience - on-demand speed and high-efficiency cruising - we recommend a 36V battery. It unlocks the kayak’s maximum potential, runs cooler and more efficiently at all speeds, and provides the most versatile power platform for modern marine electronics.
Performance Breakdown by Voltage
12V: Entry-Level Utility
- Top Speed: 3.8 mph (150W)
- Ideal For: Calm freshwater lakes and casual exploration.
- Runtime: A 12V 100Ah battery provides approximately 8 hours at full throttle.
24V: The Versatile Middle Ground
- Top Speed: 4.9 mph (750W)
- Ideal For: Anglers who want more cruising speed and 24v accessory compatibility.
- Runtime: A 24V 50Ah battery (~1,200Wh) provides approximately 1.5 hours at full throttle.
36V: Maximum Endurance & Performance
- Top Speed: 6.0 mph (Expected; final tuning in progress)
- Ideal For: Serious endurance, heavy loads, and reaching the best fishing spots quickly.
Higher voltage systems are fundamentally more efficient. In our recent 36V Full-Day Lake Test, Jason headed out with a total combined load of 317 lbs (paddler + gear). Even with a Garmin 106sv on high brightness, the boat covered 14.42 miles and returned with 55% battery remaining.
Understanding Battery Capacity: The Formula
Battery capacity isn't just about Amp-Hours (Ah); it’s about total energy displacement, measured in Watt-Hours (Wh).
- 12V 100Ah = 1,200Wh
- 36V 50Ah = 1,800Wh (50% more total energy)
Physical Integration: The Group 31 Standard
The FluxJet is designed with an integrated Group 31 battery box. Your choice of battery must fit these dimensions to be secured properly.
Standard Group 31 Dimensions: Approx 13" L × 6.8" W × 9.4" H
Note for Smaller Batteries: The FluxJet battery box includes an internal divider. This engineering feature allows you to safely secure smaller battery sizes within the standard Group 31 housing, preventing shifting during transport or high-speed maneuvers.
(Reference specific dimensions via Noco’s technical support here)
Lithium (LiFePO4) vs. Lead-Acid: Lithium is the superior choice for the FluxJet. While the upfront cost is higher, Lithium is significantly lighter and holds a consistent voltage curve. Ensure any lithium battery you buy has an integrated Battery Management System (BMS) for safety.
Pro-Tips from the Engineering Team
- Verify Dimensions: We receive inquiries daily regarding Golf Cart (GC2) batteries. They are generally too big for a Group 31 box. Confirm measurements before purchasing.
- Timing Matters: If your FluxJet delivery is months away, wait to buy your battery. Lithium technology and pricing are evolving rapidly.
- Support Local: We recommend taking your battery box to a local marine battery shop to test the physical fit before buying. Local warranty support for your primary power source is a bonus.
Common Questions
Can I use a lithium battery?
Absolutely. They are lighter and perform better. Just verify Group 31 fitment and BMS inclusion.
Will a 12V battery work if I want to add a trolling motor later?
Unlikely. Most require higher voltage. If a motor is in your future, invest in 24V or 36V now to avoid buying a whole new battery later.
Still Have Questions?
We are grounded in data and here to help. If you are a FluxJet pre-order customer, reply to your confirmation email for a technical consultation. Or watch Jason's full 36V Lake Test here.
See you on the water.
The FluxJet Team