FM+ 650 Battery

Ready to ship in 7–10 days or pick up your order from Stonker Boardsports when ready. FM+ 650 BATTERY The FM+ 650 Battery sits at the intersection of runtime, weight and cost, and is the "go to" battery option for both Gen 2.5 Fusion and Assist 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, through to wake riding, pumping, flatwater starts and light eFoiling. Engineered to work across both Fusion and MAX+, it gives riders the flexibility to move one battery between two very different setups. For MAX+ riders, this is the highest-capacity battery, offering plenty of runtime for a full surf session. Fusion riders simply add the FM+ Battery Adaptor for a lighter, more manoeuvrable alternative. Details Gen 2.5 battery technology lets you use the battery deeper into the cycle — full power delivery right down to ~10% before "sag" sets in Charges via the 43V Charger (included with Fusion or MAX+) — averaging an 85 minute charge time, with an industry-first Storage Mode to limit charging for long-term battery health (store between 30–60% SoC) Intelligent Bluetooth Module (BMS) feeds accurate battery data to the V3 Controller and the Foil Drive App — name each battery, track its health and view State of Charge One-piece moulded design combines the battery and nose cone as a unified sealed unit, improving water flow and durability while balancing weight over the foil's centre of lift Internal thermal management keeps temperature stable for consistent power through the full discharge curve Tech Specs Rated Capacity: 648Wh Amp Hours: 15Ah Nominal Voltage: 43.2V Max Voltage: 50.4V Battery Weight: 3.95kg / 8.70lbs Dimensions (Battery): L460 x W125 x H55mm Dimensions Installed: L540 x W125 x H55mm (MAX+) · L658 x W125 x H55mm (Fusion) Nose Cone: Not required — integrated Battery Type: Lithium-Ion Water Rating: IP68/IP69 Water and Dust Resistance Certified: UN38.3, CE, FCC, WEEE, RoHS, PSE, IP68, IP69 Indicative runtime (85kg rider, 800cm² wing, 5'0 40L board): E-Foil ~29 min (intermediate) / ~48 min (advanced) in flat water. Surf ~40–50 min (intermediate) / ~55–70 min (advanced) in 3ft swell. Runtime varies with rider weight, skill, gear and conditions. What's Included FM+ 650 Battery · FM+ 650 Battery Carry Case Compatible With Foil Drive Fusion (requires FM+ Battery Adaptor) · Foil Drive Assist MAX+ · FM+ Battery Adaptor · 43V Standard Charger · Foil Drive Battery Caddy (with FM+ Battery Adaptor) Not compatible with the Gen 2 MAX (40V) unit.