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2026: Duotone
SKU:
40260-6704

Foil Assist Batteries & Chargers

£766.00
£0.00 £766.00
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Select Model: Battery 7ASet (2Pcs)
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Our lithium high-voltage batteries (LiHV) were specifically engineered for the Duotone Foil Assist system and ensure consistent power output throughout use, providing reliable and powerful assistance for a fun ride.

FULL DESCRIPTION

Foil Assist Battery 7A

2 Piece Set 40260-6704  /  1 Piece Set 40260-6701

Our lithium high-voltage batteries (LiHV) were specifically engineered for the Duotone Foil Assist system and ensure consistent power output throughout use, providing reliable and powerful assistance for a fun ride.

Please note that you need to plug in two batteries to make the Foil Assist work.

Designed with travel in mind, our batteries comply with air travel regulations, featuring a capacity of 159.6 Wh - just under the 160 Wh limit for air transport*. This means you can take your Foil Assist system anywhere, opening up access to new spots you never imagined and making your foiling experience truly limitless.

We advise investing in an additional set of batteries. This allows you to extend your foil sessions, making them last as long  as you do.

Battery Charger Set (40260-6700)

The charger is specifically designed for the Foil Assist batteries and can hold up to two batteries at once. Charge your batteries in just one hour and be back on the water in no time. If you don't plan to use the batteries again that day, we recommend charging or discharging them to about 50% (2-3 LED lights). This prevents over-discharge and ensures they last longer. Another advantage of this charge level is that you will need less time to fully recharge the batteries. The charger set includes a docking station and an adapter cable. The docking station has only three buttons, making it very easy to use. You will find an instruction sticker on it that explains how to charge or discharge the batteries. The indicator lights, as well as the blinking LED lights on the batteries, inform you whether the batteries are being charged or discharged and what their charge level is. To ensure you can easily plug the charger into your outlet, it comes with a suitable plug for your region (EU, USA, Australia, Brazil, and the United Kingdom).

Battery Smart Dock (40260-6703)

The Smart Charger was specially designed for our Duotone Foil Assist batteries. Combining efficiency and simplicity, this charger ensures that you get the most out of your batteries with every charge.

The Smart Charger was specially designed for our Duotone Foil Assist batteries. Combining efficiency and simplicity, this charger ensures that you get the most out of your batteries with every charge.

Battery Charger Adapter (40260-6702)

The adapter is part of the battery charger set and comes with a regional plug suitable for specific regions, including the EU, US, Australia, Brazil, and the United Kingdom. It features a reliable fast charging adapter as well as an LED light that indicates when the charger is connected to power and when the batteries are charging.

KEY FEATURES

Foil Assist Battery 7A

TYPE: LiHV

CAPACITY: 7 Ah

VOLTAGE: 22.8 V × 2

ENERGY: 159.6 Wh X 2

WEIGHT: 1 kg X 2

The battery runtime depends on several factors, including your skill level, weight, riding conditions, board size, used speed level and the efficiency of the foil you have mounted; it ranges between 30 and 60 minutes.

Battery Smart Dock

FAST-CHARGING MODE AND CHARGING TIME

The Smart Charger features a fast-charging mode that allows you to charge your batteries quickly (in approx. 1 hour) and effectively, getting you back on the water in no time.

"MID" STORAGE MODE  

For those times when the batteries won't be in use for an extended period, the "MID" storage mode keeps your batteries at an optimal charge level. This ensures their health and safety, preventing over-discharge.

BATTERY LONGEVITY 

Designed with battery longevity in mind, the Smart Charger helps you achieve extended life from your batteries for countless rides to come.
PRODUCT INFORMATION

Our lithium high-voltage batteries (LiHV) were specifically engineered for the Duotone Foil Assist system and ensure consistent power output throughout use, providing reliable and powerful assistance for a fun ride.

FULL DESCRIPTION

Foil Assist Battery 7A

2 Piece Set 40260-6704  /  1 Piece Set 40260-6701

Our lithium high-voltage batteries (LiHV) were specifically engineered for the Duotone Foil Assist system and ensure consistent power output throughout use, providing reliable and powerful assistance for a fun ride.

Please note that you need to plug in two batteries to make the Foil Assist work.

Designed with travel in mind, our batteries comply with air travel regulations, featuring a capacity of 159.6 Wh - just under the 160 Wh limit for air transport*. This means you can take your Foil Assist system anywhere, opening up access to new spots you never imagined and making your foiling experience truly limitless.

We advise investing in an additional set of batteries. This allows you to extend your foil sessions, making them last as long  as you do.

Battery Charger Set (40260-6700)

The charger is specifically designed for the Foil Assist batteries and can hold up to two batteries at once. Charge your batteries in just one hour and be back on the water in no time. If you don't plan to use the batteries again that day, we recommend charging or discharging them to about 50% (2-3 LED lights). This prevents over-discharge and ensures they last longer. Another advantage of this charge level is that you will need less time to fully recharge the batteries. The charger set includes a docking station and an adapter cable. The docking station has only three buttons, making it very easy to use. You will find an instruction sticker on it that explains how to charge or discharge the batteries. The indicator lights, as well as the blinking LED lights on the batteries, inform you whether the batteries are being charged or discharged and what their charge level is. To ensure you can easily plug the charger into your outlet, it comes with a suitable plug for your region (EU, USA, Australia, Brazil, and the United Kingdom).

Battery Smart Dock (40260-6703)

The Smart Charger was specially designed for our Duotone Foil Assist batteries. Combining efficiency and simplicity, this charger ensures that you get the most out of your batteries with every charge.

The Smart Charger was specially designed for our Duotone Foil Assist batteries. Combining efficiency and simplicity, this charger ensures that you get the most out of your batteries with every charge.

Battery Charger Adapter (40260-6702)
The adapter is part of the battery charger set and comes with a regional plug suitable for specific regions, including the EU, US, Australia, Brazil, and the United Kingdom. It features a reliable fast charging adapter as well as an LED light that indicates when the charger is connected to power and when the batteries are charging.
KEY FEATURES

Foil Assist Battery 7A

TYPE: LiHV

CAPACITY: 7 Ah

VOLTAGE: 22.8 V × 2

ENERGY: 159.6 Wh X 2

WEIGHT: 1 kg X 2

The battery runtime depends on several factors, including your skill level, weight, riding conditions, board size, used speed level and the efficiency of the foil you have mounted; it ranges between 30 and 60 minutes.

Battery Smart Dock

FAST-CHARGING MODE AND CHARGING TIME

The Smart Charger features a fast-charging mode that allows you to charge your batteries quickly (in approx. 1 hour) and effectively, getting you back on the water in no time.

"MID" STORAGE MODE  

For those times when the batteries won't be in use for an extended period, the "MID" storage mode keeps your batteries at an optimal charge level. This ensures their health and safety, preventing over-discharge.

BATTERY LONGEVITY 

Designed with battery longevity in mind, the Smart Charger helps you achieve extended life from your batteries for countless rides to come.

DELIVERY & RETURNS

Life is complicated enough, so we've made returning items as simple as possible for mainland UK. Head to your account and click the link for returning items and we'll take it from there. For exchanges, simply select "refund" and re-order the required item again. We'll refund the very moment it's returned to us.

For NI, Channel Islands, Europe and Rest of World, you the customer will need to return the item to us as collections are not possible.

For item's where we've made a mistake or the item is faulty - we'll refund all postage costs on receipt of postage receipt and dispatch replacements items FOC. For items simply no longer required or where you the customer has ordered the incorrect size or product, return postage will not be refunded and dispatching out will be chargeable.
Duotone Foil Assist Battery 7A Set (2Pcs) - Wing Foil | H2O Sports
£766.00
£0.00 £766.00

Let customers speak for us

from 131 reviews

Nice to not have to rinse the charging pins on the woo after every session ;)

Renato
Woo 4.0

great communication and delivered the product when they said. Would definitely use again!

Chris Hover
H20 Sports
Wing Foiling Gear

I cannot sing enough praises for H2O Sports! I have over the years made small purchases because they’ve been the most competitive online but recently I bought some new wing foiling kit and there was some slight damage to the alloy mast - well H2O’s aftercare was second to none!! They were instantly chasing down a replacement part and happy for me to be using the old part (albeit a bit bent) whilst waiting for the replacement. So refreshing to experience such great customer service.
Many many Thanks! - will be ordering more and more from this company!!!

Mike
H20 Sports

Great buying experience. Great prices and delivered quickly. Thanks Guys.

Andy PG
H20 Sports
Duotone Unit SLS 2025

After purchasing this wing earlier this year it has noticeably made tacks so much smoother and overall upgraded my riding. I bought the 3.0 and 5.0 metre and my 3.0m flies very well in both underpowered and overpowered conditions

Emma
Unit SLS Concept Blue Wing
Duotone Carve DLAB and Unit SLS wing

I purchased the Unit SLS 2025 wing earlier this year and it has made tacks so much smoother and upgraded my riding. I also bought the Duotone Carve 3.0 D/LAB 2025 with the 800 front wing and once again it’s been a game changer, having a great amount of glide which works perfectly for both wingfoiling and kitefoiling!
All thanks to the H2O team that always have loads of knowledge, passion for watersports and go above and beyond!

Emma
H20 Sports

Preferring not to throw away my (now discontinued) North Red boom which had a broken cuff, I called H2O to see if there was any way to salvage it. I spoke with Matt who was very knowledgeable and helpful but came off the phone somewhat resigned that I might not be able to get the part. However to my surprise a little while later I was blown away (with a force 5) when I got a call to tell me he’d sourced one for me. And here I am now, a week on, with all the bits I need to get back on the water; whoever said people don’t have time to help others! So the moral of this story is have a little faith and try H2O!

Davalar Kinsey
H20 Sports
5* Service - Putting customers first 5*

Preferring not to throw away my (now discontinued) North Red boom which had a broken cuff, I called H2O to see if there was any way to salvage it. I spoke with Matt who was very knowledgeable and helpful but came off the phone somewhat resigned that I might not be able to get the part. However to my surprise a little while later I was blown away (with a force 5) when I got a call to tell me he’d sourced one for me. And here I am now, a week on, with all the bits I need to get back on the water; whoever said people don’t have time to help others! So the moral of this story is have a little faith and try H2O!

Davalar
H20 Sports
Light wind lift

Ordered a 1350 Glide 2.0 to progress on to from my 1750 aero free. Being a heavier rider I've found it's now my go to foil wing, initially a bit harder to get on the foil compared to the aero free but once up it feels completely effort less! Thanks to the team for getting me sorted out 🤙

Kyle Gould
Glide 2.0 SLS Wing Set
The best in the business.......

James, Matt and the H20 Team are absolute gurus of the water sports industry, friendly, helpful and knowledgable. They will always give the right advice and come up with superb deals and first class support, thanks guys for always helping me to make the right decisions over the last 20 + years!

Tim H
H20 Sports
Duotone slim 2.0 Dlab 2.0 carbon mast

My new mast arrived from H20. Sports and it was so worth the wait. You immediately notice how much stiffer it is compared to the v1 carbon version when riding. The foil feels more responsive and direct .It also glides longer in transition s and riding bumps.
Its well worth the upgrade in my opinion.

Tim
Foil Mast Slim 2.0 D/LAB
Duotone Float 5 m is a summer light wind weapon

I bpught this wing to replacr my Unit 5.5 m wing for tje summer breezes as i never liked using big wings. This wing is really powerful in the low end and allows you to pump really efficiently to get on foil with a bit of technique.
You can size down by half a metre with this wing compared to a Unit.
Its still fast and so good iwhen you roll into a tack.
Perfect quiver would be a 3 m , 4m & a 5 m in the Float for all conditions.
Its a great price too as lower than Dlab and SLS wings but with great performance.

Tim
Float Wing
Duotone sky surf/sky style, Duotone unit, Dlab foil range.

As one of the H2O riders I have really enjoyed the variety of kit H2O have available. Including the Duotone sky surf 35Ltr which quickly become my favourite board because of its shorter and thicker shape while being low in litres it still allows me to get it out the water in some lighter winds. However it comes into its own when the wind is strong and the waves are pumping with its incredible manoeuvrability. Paired with the Duotone units (that are light weight and precisely balanced) wave riding is a dream.

Ted Lockyer
H20 Sports
New to downwind boards and loving it!

I've been one of those riders who thought one board was enough. Turns out a downwind board has opened up so many more days on the water. I cant believe how easy this beast gets going in 6 knots. I use my 8' board with the 1100 and 1595 Duotone Glide. It's like a whole new sport. Whilst I've tried paddling up, I think I'll stick to winging for now (although can't wait to try the Stash Parawing).

Graham Lockyer
Downwinder SLS Wing Board
Enhanced low-end power, stability, and maneuverability at a great price

Lots of the benefits of the DLAB Unit but without the price tag. Strong, light, and powerful. It's been great in all conditions, handles really well when over powered. I bought the 3.5, 4.5 and 5.5 to cover all eventualities. Personally I prefer the handle option which works really well with my harness. Matt and the team really helpful in deciding on the sizing.

Graham Lockyer
Unit SLS Concept Blue Wing