Foil Drive Fusion Battery w/ Caddy

The Foil Drive Fusion Battery w/ Caddy is the dedicated power source for Foil Drive's Fusion foil-assist system, sold here as a standalone battery-and-caddy package for riders who want a spare or replacement unit. Built on Foil Drive's 43-volt architecture, the Fusion 860 battery holds 864 Wh of energy in a one-piece molded housing that integrates the battery cells and nose cone into a single sealed unit. This design improves hydrodynamic flow and structural rigidity compared to multi-piece assemblies. The included Battery Caddy serves triple duty as a protective transport cradle, a state-of-charge display station, and a USB power bank with both USB-A and USB-C ports.

Foil Drive, the Australian company that pioneered the foil-assist category, introduced the Fusion platform as a step beyond its earlier Gen 2 and MAX systems. The Fusion 860 battery is not cross-compatible with MAX or Slim drive units — it is purpose-built for the Fusion electronics and motor.

• Capacity: 864 Wh (20 Ah)
• Nominal Voltage: 43.2 V
• Max Voltage: 50.4 V
• Battery Weight: 4.9 kg / 10.8 lbs
• Dimensions: 575 × 122 × 54 mm
• Cell Chemistry: Lithium-Ion
• Water & Dust Rating: IP69
• Charge Time: ~1.45 hours (with 43 V charger)
• Certifications: UN, CE, FCC, WEEE, RoHS
• Caddy Features: State-of-charge display, heatsink discharge mode, USB-A and USB-C power bank output
• Included: Fusion 860 Battery, Battery Caddy, Battery Terminal Cap, Battery Carry Case

The Fusion 860 battery suits any rider running the Foil Drive Fusion system who needs extended time on the water or wants a second battery for back-to-back sessions. With roughly twice the capacity of the older MAX Power battery (498 Wh), the 860 delivers one to three hours of ride time depending on rider weight, foil size, and throttle use. That range moves the Fusion system from pure foil-assist territory into something closer to a lightweight eFoil experience, particularly useful for flat-water cruising, motoring out to a break, or adding a safety margin on exposed downwind runs.

The caddy's storage-discharge feature is a practical addition for anyone who doesn't ride every week. It lets you draw the cells down to a recommended storage percentage, which helps preserve long-term battery health — a detail that matters given the investment in lithium-ion packs at this price point.

Within the Foil Drive ecosystem, the Fusion 860 is currently the sole battery option for the Fusion platform; the brand's battery collection page lists it as the only Fusion-compatible cell. It sits above the MAX High Power battery in both capacity and voltage, but the two are not interchangeable — different connectors and voltage rails keep each generation separate. Riders still on the Gen 2 or MAX system would need to upgrade the full Fusion drive unit before this battery becomes useful.

For buyers comparing foil-assist battery costs across brands, the Fusion 860's 864 Wh capacity and IP69 water rating place it among the higher-spec options in the category. Lift Foils and Fliteboard sell proprietary batteries for their eFoil platforms at similar or higher price points, though those are full eFoil systems rather than assist units. The closest like-for-like comparison remains a second Foil Drive MAX battery, which offers less runtime at a lower cost and only works with the MAX system.