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.
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| Less than < $100 | $15 |
| More than > $100* | FREE* |
* Excludes hardboards, consignment goods, second-hand goods, demo stock, and oversized items. A flat rate for shipping applies as follows to bulky items and boards:
East Coast (NSW, QLD, VIC, ACT) |
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| Bulky Items | $50 |
| Boards | $150 |
Other (WA/NT/SA/TAS) |
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| Bulky items | $80 |
| Boards | $250 |