The V3 Controller can be used with every generation of Foil Drive system.

To display an accurate battery percentage, the controller needs to know which battery architecture your system uses.

Selecting the correct battery voltage ensures the battery percentage displayed on your controller accurately reflects your battery's remaining charge.

Why do I need to select a battery voltage?

Different Foil Drive systems use different battery voltages.

The V3 Controller uses this setting to calculate the battery percentage displayed on screen.

If the incorrect battery voltage is selected, the controller may display an inaccurate battery percentage.

Important: This setting does not affect motor performance or battery operation—it only affects how the remaining battery percentage is displayed.

Which battery voltage should I select?

Choose the voltage that matches your Foil Drive battery.

Each battery is clearly labelled with its operating voltage.

If you're unsure, check the label on your battery before changing the controller setting.

What happens if I choose the wrong battery voltage?

For most Foil Drive systems, selecting the wrong battery voltage will cause the controller to display an incorrect battery percentage.

For example:

If a 40V Gen2 battery is configured as 28V, the controller may show the battery remaining near 100% for most of the session before rapidly dropping near the end of the discharge.

This occurs because the controller is estimating battery percentage based on the wrong battery voltage.

The system itself will continue operating normally.

Does selecting the wrong voltage damage my Foil Drive?

No.

Selecting the incorrect battery voltage will not damage your battery or Foil Drive system.

The only effect is that the displayed battery percentage may be inaccurate.

Why is Fusion different?

Fusion uses a Smart Battery Management System (Smart BMS) that communicates directly with the V3 Controller.

Instead of estimating battery percentage from battery voltage, the Smart BMS reports the battery's actual State of Charge.

This means the controller always displays an accurate battery percentage, regardless of the selected battery voltage.

Why doesn't my Fusion battery percentage change while riding?

This is normal.

Fusion reports the battery's actual State of Charge from the Smart BMS.

The battery percentage decreases steadily, similar to the battery indicator on a mobile phone.

You should not see large percentage fluctuations while accelerating.

Why does my Gen2 battery percentage change when I pull the throttle?

This is also normal.

Gen2 systems estimate battery percentage from battery voltage.

Whenever the motor is under load:

• Battery voltage temporarily drops.
• The displayed battery percentage decreases.
• When throttle is released, battery voltage recovers.
• The displayed battery percentage rises again.

This temporary fluctuation is a normal characteristic of voltage-based battery estimation.

My battery percentage keeps changing. Is something wrong?

Usually, no.

If you're using a Gen2 or earlier Foil Drive system, the battery percentage may increase and decrease as throttle is applied and released.

This behaviour is expected and does not indicate a fault.

If you're using Fusion, the battery percentage should decrease gradually and remain much more stable throughout your session.

Frequently Asked Questions

How do I know which voltage to select?

Check the voltage printed on your battery.

Then select the matching voltage within the V3 Controller.

Does changing the battery voltage affect performance?

No.

The battery voltage setting only affects how the controller calculates and displays the remaining battery percentage.

Motor performance is not affected.

Can I leave the wrong voltage selected?

The system will still operate, but the battery percentage shown on the controller may be inaccurate.

Foil Drive recommends selecting the correct battery voltage for the most reliable battery information.

Why is my Fusion battery percentage more accurate than my previous system?

Fusion communicates directly with its Smart BMS, which reports the battery's actual State of Charge.

Previous generations estimate battery percentage from battery voltage, which naturally changes under load.

Best Practice

Whenever changing to a different Foil Drive battery system, check that the V3 Controller is configured for the correct battery voltage.

Using the correct setting ensures the most accurate battery percentage display and helps you better manage your remaining ride time.