Foil Drive Assist Slim Endurance Battery


Available in 10-15 days after order.

Assist PLUS battery requires a 28v charger that can be bought separatly.


The Assist Slim is smaller and lighter with a shorter run time, designed for performance foiling. It offers enough power for assisted foiling, while remaining super compact!

The Foil Drive Assist Slim is the smaller, lighter, performance orientated model, for the ultimate in performance hybrid electric assist foiling. Despite its small size, it offers the plenty of thrust to get you of foil easier and sooner however the smaller batteries do reduce the run time. The Assist Slim is perfect for advanced, high performance riders or wingers/downwinders that do not require lots of battery capacity.

At just 35mm thin, the Assist Slim is engineered for the performance orientated rider. No matter if its ripping turns on a prone board, sending downwind missions in bombing conditions, enabling smaller gear winging, or extending a pump foil session, the Assist Slim is a high-performance machine.
With reduced battery capacity comes shorter runtimes, however despite its size, the Assist Slim with the Performance battery packs quite the punch, still able to launch heavier riders up on to foil with ease.
With its low weight positioned optimally under your board, once you’re up on foil you will hardly notice you still have it mounted up to your gear at all!

Maximum Thrust: 25.5kg (56.2lbs)
Weight Range: 2.3 – 2.8kg (5.0-6.1lbs) depending on battery
Dimensions: L510 x W125 x H35mm
Operating Voltage: 40V
Runtime (Generalised): 20min-2hrs depending on use case, battery and other variables.
Recharge Time: Appx. 1hr (Performance Battery)
Batteries: IP68 rated dust and water resistant

The Assist Slim mounts between your mast plate and the board. As mast tracks are universal, this means it fits any board! Simply use the provided Foil Drive Locking T Nuts and longer bolts. Sandwich your Gen2 Foil Drive between your gear for optimal weight distribution and hydrodynamics.


With three simple screws, the motor plug can be removed, allowing the rider to change their cable length and therefore motor mounting position depending on the use case.

With options to use your own foil mast or a fully integrated option, there is more ways to tune your setup than ever!


The Foil Drive Slim Endurance Battery is the larger SLIM battery with 241Wh capacity. The Endurance Battery is great for those who are wanting to lengthen their runtime with the Assist Slim, however due to the lower voltage this battery does not provide the same level of thrust and overall ride experience as the Slim Performance Battery.
Slim Endurance Battery will be available early 2024.
The Slim Endurance Battery is the only Gen2 battery that runs on a 28V system, this means you must use the 28V Standard Charger 4A with this battery. DO NOT ATTEMPT TO CHARGE THIS BATTERY WITH A 40V Charger!
As with all Gen2 Foil Drive batteries, the Slim Endurance Battery is certified IP68 rated for increased protection and peace of mind against water and dust.
The single power plug contains larger connectors that provide power to the Foil Drive unit and smaller connectors for charging the battery. The included dust cap provides extra protection during storage & transport.
Only compatible with Foil Drive Assist Slim.

Nominal Voltage: 28.8 V Max Voltage: 33.6 V Rated Capacity: 8.4 Ah Rated Capacity: 241.92 Wh Battery Weight: 1.4kg (3lbs) Certifications: UN, CE, IP68


When finalizing your order, state your Foil Drive Gen2 Motor on the Notes section (or contact us by email:

1 – Foil Drive Gen2 Motor – 15cm/ 6″
2 – Foil Drive Gen2 Motor – 20cm/ 8″
3 – Foil Drive Gen2 Motor – 25cm/ 10″
4 – Foil Drive Gen2 Motor – 60cm/ 23.5″
5 – Foil Drive Gen2 Motor – 70cm/ 27.5″

If you want to place the motor at different heights on your mast with maximum performance and minimum drag, you can add a Foil Drive Gen2 Stator Only (with cable) for more 533 euros:
1 – Foil Drive Gen2 Stator Only – 15cm/ 6″
2 – Foil Drive Gen2 Stator Only – 20cm/ 8″
3 – Foil Drive Gen2 Stator Only – 25cm/ 10″
4 – Foil Drive Gen2 Stator Only – 60cm/ 23.5″
5 – Foil Drive Gen2 Stator Only – 70cm/ 27.5″


*Choice of Battery with Lipo Bag*
*Choice of Gen2 Motor with 2 Blade Propeller/Hub and Stubbie Cooler*
*Choice of Mast Adaptor*

Foil Drive Assist MAX Electronics Box
Motor Plug Protector with Keychain
Foil Drive Nose Cone A
Foil Drive Nose Cone B
Foil Drive Universal Motor Pod – Rear
Foil Drive Universal Motor Pod – Short Nose
Foil Drive Universal Motor Pod – Long Nose
Foil Drive v2 Wireless Throttle Controller
Foil Drive Controller Wrist Strap
Foil Drive Mast Cable Guide 23cm
Foil Drive Controller Wireless Charge Pad
Micro USB Cable
40v Standard Foil Drive Charger 4amp
4x Mast Track Foam Inserts
2x Nose Cone Rocker Pad
2x Battery Grease
4x M8 Assist MAX Mast Plate Bolts 80mm
4x M6 Assist MAX Mast Plate Bolts 80mm
Foil Drive 2.5mm Driver
Torx T40 Tee Handle Driver
Torx T30 Tee Handle Driver
Foil Drive Cleaning Cloth
Foil Drive Gen2 Carry Case

Foil Drive Mounting Bolt Bag
– 4x M8 Locking Tee Nuts
– 4x M6 Locking Tee Nuts
– 4x M3 x 20mm Bolts for Locking Tee Nuts
– 2x M3 x 16mm Latch Locking Bolts

Foil Drive Motor and Pod Bolts Bag
– 4x Motor Pod Bolts (M3 x 12mm)
– 3x Puck Bolts (M3 x 12mm)
– 3x Motor Plug Bolts (M4 x 10mm)

Spare Parts Bag
– 2x O-Ring Seals – Foil Drive Assist MAX
– 2x Latch Assembly – Foil Drive Assist MAX
– 3x Motor Plug Bolts (M3 x 12mm)
– 4x Motor Pod Bolts/Puck Bolts (M3 x 12mm)
– 2x Latch Locking Bolts (M3 x 16mm)
– 2x Propeller Bolts (M3 x 30mm)
– 2x Latch Pivot Bolts (M3 x 45mm)

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