• #ORMD
  • Compatible with: Assist MAX Plus
  • Compatible with: Fusion
  • DG
  • Foil Drive
  • Gen 2.5
  • Hazmat
  • PUBLISH CANDIDATE - approved
  • Sub Category: Battery

Foil Drive FM+ 650 Battery

$1,349.00
$1,349.00
Foil Drive FM+ 650 Battery
Foil Drive FM+ 650 Battery
Foil Drive FM+ 650 Battery
Foil Drive FM+ 650 Battery
Foil Drive FM+ 650 Battery
Foil Drive FM+ 650 Battery
Foil Drive FM+ 650 Battery
Foil Drive FM+ 650 Battery

Product details

Description

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, upwind/downwind runs, wake riding, pumping, flatwater starts and light eFoiling. For Assist 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 setup.

Gen 2.5 battery technology lets you use the battery “deeper” into its cycle, with full power delivery down to around 10% before you notice the sag all batteries experience. A smart Bluetooth BMS sends accurate battery data to the V3 Controller and the Foil Drive App, where you can name each battery, track its health and view its state of charge. The one-piece moulded design combines battery and nose cone in one sealed unit, and internal thermal management keeps power consistent through the full discharge curve.

Charging: requires the 43V Standard Charger (supplied with every Fusion and MAX+ system). Average charge time is about 85 minutes, with a Storage Mode for long-term battery health (store between 30 and 60% state of charge).

Not compatible with the Gen 2 (40V) Assist MAX. The FM+ 430 battery is coming early 2027.

Specs

Rated Capacity 648Wh
Amp Hours 15 Ah
Nominal Voltage 43.2V
Max Voltage 50.4V
Battery Weight 3.95 kg / 8.70 lbs
Battery Dimensions L460 x W125 x H55 mm
Installed Length 540 mm with MAX+ | 658 mm with 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

eFoil, intermediate* ~29 min
eFoil, advanced* ~48 min
Surf, intermediate** ~40–50 min
Surf, advanced** ~55–70 min

Runtime varies with skill, weight, gear and conditions; indicative guide only. *85 kg rider, 800cm² wing, 5'0 40L board, flat water, ~70% throttle. **Same rider and gear in 3ft swell with under 5 kts wind.

In the box: FM+ 650 Battery, FM+ 650 Battery carry case.

Compatible with: Foil Drive Assist MAX+, Foil Drive Fusion (with FM+ Battery Adaptor), 43V Standard Charger, Foil Drive Battery Caddy (with FM+ Battery Adaptor).

All Foil Drive batteries ship at less than 30% charge in line with shipping regulations. Charge before first use. This is a lithium battery (dangerous goods) and ships ground only.

Need help confirming compatibility? Contact The Foil Shop before ordering and we’ll help match the right Foil Drive part to your system, mast, battery, and riding goals.