The FM+ 650 Battery sits at the intersection of runtime, weight and cost and is your “go to” battery option for both Gen2.5 Fusion and MAX+ units.

With 648Wh of capacity, Foil Drive’s 43V architecture unlocks powerful, consistent thrust, and endurance for extended surf sessions and upwind downwind runs to wake riding, pumping, flatwater starts and light eFoiling.

Engineered to work across both the Fusion and the MAX + units, gives riders the flexibility to move one battery between two very different setups.

For MAX+ riders, this is your highest capacity battery, offering plenty of runtime for a full surf session. Fusion riders simply add the FM+ Battery Adaptor for lighter, more maneuverable alternative.

Details

Gen2.5 Battery Technology allows the rider to utilize the battery for longer. The battery is able to perform “deeper” into the cycle, meaning on water you’ll be able to enjoy the full power delivery right down to ~10% battery before you begin to notice the “sag” that all batteries experience.

Charging
The FM+650 Battery requires 43V Charger (Provided with your Fusion or MAX+ System) to charge. Averaging 85 minute charge time with an industry first Storage Mode that allows you to limit charging to then store your batteries for long-term battery health. We recommend storing you battery between 30 and 60% State of Charge (SoC).

Intelligent Bluetooth Module (BMS) provides accurate battery data to the V3 Controller, giving clear percentage and status readouts. The Battery also connects to the Foil Drive App where you can name each battery, track its health and view it's battery State of Charge (SoC). Check the surf camera and your battery charge without lifting a finger!

One-piece molded design combines the battery and nose cone as a unified sealed unit.
The integrated one-piece molded design combines the battery and nose cone as a unified sealed unit, improving water flow, and durability, all while balancing weight directly over the foil’s center of lift.

Internal thermal management keeps temperature stable and maintains consistent power through the full discharge curve, ensuring smooth thrust delivery from start to finish.

Tech Specs

Rated Capacity (Watt Hours): 648Wh

Amp Hours: 15 Ah

Nominal Voltage: 43.2 V

Max Voltage: 50.4 V

Battery Weight: 3.95 kg / 8.70 lbs

Dimensions of Battery: L460 × W125 × H55 mm

Dimensions Installed: L540 x W125 x H55mm (Installed with MAX+) | 658x125x55mm (Installed with Fusion)

Nose Cone: Not Required - Integrated

Battery Type: Lithium-Ion

Water Rating: IP69 +IP69 Water and Dust Resistance

Certified: UN38.3, CE, FCC, WEEE, RoHS, PSE, IP68, IP69

Note: Proper care is essential for battery longevity, please see your Battery and Charger user manuals for more.

*E-Foil Runtime Intermediate: ~29 mins

*E-Foil Runtime Advanced: ~48 mins

**Surf Runtime Intermediate: ~40-50 mins

**Surf Runtime Advanced: ~55-70 mins

Runtime is highly variable depending on skill, weight, gear sizing and weather conditions. This is an indicative guide only based on real life averages.

*Based on rider weight 85kg, with wing size of 800cm2, 5'0 40L board in flat water conditions. Throttle at ~70%.Intermediate rider has many touch downs and multiple falls/restarts. Advanced rider has no touch downs and no falls.

**Based on rider weight 85kg, with wing size of 800cm2, 5'0 40L board in 3ft swell, with less than 5kts wind. Intermediate rider has high motor reliance and is not pumping between waves, with many falls/restarts. Advanced rider has medium motor reliance and will link some waves by pumping, with minimal falls/restarts

What’s Included

FM+ 650 Battery

FM+ 650 Battery Carry Case

Compatible With

Foil Drive Fusion (with FM+ Battery Adaptor)

Foil Drive MAX+

FM+ Battery Adaptor

43V Standard Charger

Foil Drive Battery Caddy (with FM+ Battery Adaptor)

Not Compatible with Gen 2 MAX Unit.

FOIL DRIVE FM+ 650 Battery

Quantity