eFoil battery

How big is an eFoil battery?

The battery is three things at once: the heart of an eFoil, its heaviest single component, and the biggest slice of what you pay. Today's full-size packs hold 2 to 2.6 kilowatt-hours and weigh about 13 to 19 kg. To put that in context, look at e-bikes: Bosch's biggest bicycle battery, the PowerTube 800, holds 0.8 kWh. So you stand on the energy of roughly three of them. The table below lists the current packs from the major brands, with every figure taken from official manufacturer data.

Those spare-pack prices explain why the battery, not the board, sets the value of a complete eFoil: €2,400 to €5,000 per pack works out at roughly a quarter to almost half of the price of a full set, from about 26% for Lift's Gen5 against a $14,999 LIFT5 to 48% for SiFly's PowerCell LR against a €4,999 Rider set (both SiFly prices excl. VAT, read 3 October 2026). On the used market, battery condition is the first thing to check, ahead of the cosmetics and ahead of which wings come in the box. Our guide to buying a used eFoil works through the checks in detail.

Two columns of that table are worth reading together. Divide capacity by weight and the packs separate out: the Aerofoils Endurance works out to about 172 Wh per kilogram on the 2,230 Wh and 13 kg its battery page prints (about 163 on the 2,120 Wh of the set spec sheets), the Lift Gen5 to about 158, the Fliteboard Flitecell Explore to about 145, the Awake Flex XR 4 to about 138, and the Waydoo 2300 Wh pack to about 122. SiFly publishes neither a kWh figure nor a weight for the PowerCell LR, so it stays out of this comparison. Those figures cover the whole pack, not the bare cells, so what you are really comparing is housings, waterproofing, connectors and cooling as much as chemistry. A heavier pack is not automatically the worse one, but it is weight you carry to the water and back for the rest of the board's life.

The light packs are a different proposition altogether. Lift's LIFTX Light holds 0.54 kWh at 5.6 kg and Fliteboard's Flitecell Nano 806 Wh at 6.2 kg, which turns the battery from a two-handed lift into something you can carry down to the shore alongside the board. You pay for that in ride time, and in efficiency: a small pack still needs a full housing and a full set of connectors, so the fixed weight is spread over fewer cells.

Voltage is the other number to read, where a maker prints it at all. Fliteboard gives the Flitecell Explore 52 V nominal (58.8 V fully charged) and the Nano 50.4 V nominal, SiFly prints 58.8 V for the battery in its sets, and Waydoo's chargers top out at 58.8 V; Lift, Aerofoils and Awake publish no pack voltage. Higher voltage moves the same power at lower current, which is an engineering decision rather than something you feel on the water. The practical consequence matters, though: packs and chargers are brand-specific, and nothing crosses between manufacturers.

Range: how long a charge lasts

Manufacturer promises run from 25 to 60 minutes on the small batteries up to an hour and a half to two and a half hours on the big packs. Lift quotes an average of 90 minutes for the Gen5 battery, Waydoo EVO and SiFly both state 120 minutes, and Fliteboard promises up to two and a half hours with the Explore pack. Comparing those numbers only goes so far, because hardly any brand says which rider and what speed produced them. SiFly is the welcome exception: 75 kg rider, 15 km/h (roughly 9 mph), large wing, printed right next to the claim.

Out on the water, rider weight, speed, wing size and the state of the surface move ride time more than anything on the spec sheet. Fliteboard says as much in its own FAQ: the Flitecell Explore can run for more than two hours, yet constant high speed or repeated touchdowns and restarts can empty it in under an hour. Cold pulls capacity down as well: on an early-season session with water under 10 °C (50 °F), the summer figure is not the number to plan your afternoon around. Our eFoil comparison table sets the published claims side by side.

There is a reason the same battery gives such different answers to different riders. Drag climbs steeply with speed, so the last few km/h cost far more energy than the first few. Flying is the efficient state: once the foil carries you clear of the surface, the motor pushes a slim mast through the water instead of a whole board. A rider who can hold flight for long stretches gets noticeably more out of a pack than a beginner who spends the session taking off, dropping back down and powering up again from a standstill. Learning is the most expensive thing you can do to a battery, which is worth knowing before you judge your board by your first session.

Treat the published figure as a best case and plan from your own numbers instead. Note what you really get on an ordinary day, in the water temperature you ride in, at your true weight with a wetsuit and a vest on. If a full day on the water is the goal, a second pack is the only reliable answer, and it is also the most expensive accessory you can add to the set.

Charging times and chargers

Charging happens at an ordinary wall socket, but always with the brand's own charger. The big packs take 1 hour 45 minutes to 3 hours to fill. Fliteboard's Fast Charger does the Flitecell Explore in 1 hour 45 minutes, and Aerofoils' Fast Charger takes the Endurance from empty to full in 2 hours (80% after 1 hour 20 minutes). Lift puts its Gen5 battery at 140 minutes (80% after about an hour) on the charger that comes with the board, and SiFly gives up to 3 hours for the PowerCell LR. Slow charging takes 3 hours 30 minutes to 9 hours, and in exchange it copes with the limited power of a boat or a generator. Aerofoils' 600 W Standard Charger needs 3 hours 30 minutes for the Endurance (5 hours 30 minutes in its gentle mode), Fliteboard's 6 A Slow Charger under 9 hours for the Flitecell Explore. A fast charger is a serious purchase on its own. At most brands it sits somewhere around $1,000 to $1,300; SiFly and Waydoo come in lower. SiFly sells its Smart Charger, which charges at up to 25 A, for $590 (€529 excl. VAT), and Waydoo its inverter charger for $880 (€967), both prices read on the makers' stores on 3 October 2026. That Waydoo unit is the curiosity of the group: it charges the pack and also draws 240-volt AC power back out of it, up to 1,500 W continuous by Waydoo's figures, which turns your board into a power outlet at the water's edge.

Lift's own figures show the shape of a lithium charge curve. Its LIFT5 pages and FAQ put the Gen5 pack at 80% after about an hour, its LIFT5 F pages say 80 minutes for the same battery, and its battery page puts a full charge at 140 minutes, so the last fifth of the charge takes about as long as the first four fifths together. Aerofoils shows a similar taper. Its Fast Charger brings the Endurance to 80% in 1 hour 20 minutes and needs another 40 minutes for the rest. That tapering at the top of the range is normal behavior for a large pack, and it has a practical use: if you are trying to squeeze a second session into an afternoon, plan around the quick 80% and do not wait out the tail.

The electricity itself barely registers. A 2.3 kWh pack draws about 2.3 kWh from the wall plus a little charging loss, which at household electricity rates is small change next to what the board cost. The expensive parts of charging are the hardware and the calendar: one charger handles one pack at a time, so two batteries and a single charger means charging them back to back. If you ride from a boat or somewhere off-grid, the slow generator-friendly charger stops looking like the boring option.

Charging safety

The safety instructions read much the same from brand to brand, and they are worth following to the letter: charge with the original charger only, in a dry, well-ventilated place, away from flammable material, on a level, non-flammable surface, and never leave the pack charging unattended. Let the battery cool down after a session before it goes on the cable, and stay inside the temperatures the manufacturer specifies. Waydoo's packs will not start charging while the battery is below 10 °C (50 °F) or above 45 °C (113 °F); Awake asks for an ambient temperature around 22 °C (71.6 °F) on the charger and a cool area under 30 °C (86 °F) for charging and storage alike. Awake also wants at least one ABC or BC dry-chemical fire extinguisher 5 to 15 meters from the pack whenever it is charged or stored, with the explicit warning that water cannot put out a lithium fire.

Awake and Lift spell out the unattended rule (Aerofoils, by contrast, calls the gentle mode of its chargers perfect for overnight charging), and the reason is straightforward: when a pack of this size does go wrong, it goes wrong fast, and what is at stake is not only the battery but whatever it happens to be standing next to. A garage floor, a few meters of clearance and a working smoke alarm cost nothing compared with the pack itself.

Beyond those shared points, what applies to your battery is what your own manual says. Capacities, voltages and cell chemistries differ between brands, and so do the instructions that come with them, so read the manual properly once before the first charge and keep it wherever the charger lives. If a pack has taken a heavy impact, gone deeper than its rating allows, or simply looks, sounds or smells wrong, that is a question for the manufacturer's service department and not something to settle on the charging shelf.

Lifespan and warranty

Strange as it sounds, the obvious question (how much capacity is left after how many cycles) gets no public answer from any manufacturer. What you can see instead are the warranty terms, and those speak clearly enough. Awake, Waydoo and SiFly all draw the line at 24 months or 300 charge cycles (SiFly only in the EU and North America, with one year or 300 cycles elsewhere; Awake additionally accepts a claim only once capacity has fallen below 70%). Lift is the most candid of the group: it treats the battery as a consumable with no capacity warranty at all, and the warranty that does exist depends on charging the pack at least every three months and keeping the firmware current. Fliteboard simply gives two years, battery included, and Aerofoils gives two years on condition of a mandatory service inspection after 12 months.

Read those conditions before you buy rather than after. Requirements attached to charging intervals, firmware updates and annual service visits are obligations you have to meet in real life, in the middle of winter, when the board is in the garage and nobody is thinking about it.

For what it is worth, 300 cycles is a lot of riding. Go out twice a week, every week, and you would still be close to three years away from that number. The normal pattern with lithium packs is a slow decline rather than a sudden failure, so what you notice first is that a session ends earlier than it used to, not that the board stops working. Careful storage and the manufacturer's own charger are what stretch that curve out. When you are buying new, the battery price belongs in the total from the start, and a second pack belongs in the plan if you want full days on the water. We have run those numbers on the eFoil price page.

Flying and transport: the 160 Wh ceiling

Planning to take the board along on a flight? Bad news. The international air-transport rules airlines work to put a hard ceiling on passenger lithium batteries: up to 100 Wh travels freely, 100 to 160 Wh needs the airline's approval, and above 160 Wh the battery does not go on a passenger aircraft at all. eFoil packs hold roughly 500 to 2,600 Wh, which is 3 to 16 times the limit. The manufacturers make no secret of it: Fliteboard and SiFly state outright that the battery cannot go on a passenger plane, Awake prohibits air transport entirely, and Lift's battery guide names the Zarges case, certified to DOT, IATA, IMDG and UN hazmat rules, as the only option it approves for air transport.

The practical lesson: eFoiling is a sport you drive to. By road, an undamaged pack carried for private use is usually straightforward to move, though transport rules for lithium batteries differ by country, so check the ones that apply to you before a long trip or a border crossing. For a flight, the realistic options come down to shipping the battery ahead as freight or renting a board where you are going. That single constraint shapes travel plans more than most people expect, and it is worth settling early: book the board at the destination, or accept that the flight and the foil are two separate trips.

Where you may actually ride once you get there is a separate question with no global answer. Rules differ by country and often by individual lake or stretch of coastline, so check the local regulations before you launch. Two places we cover in detail show how far apart they can be: Croatia keeps a motorized board in a daylight band 50 to 300 m off the shore unless an escort boat comes along, while Lake Garda bans eFoils at Riva and Torbole and allows them, with distance rules, off its other shores. Our guide to eFoiling on Mallorca does the same job for the Spanish rules. And if you are still choosing between boards, start with the battery: capacity sets your ride time, the pack sets much of the price, and the charger decides how your day is organized. The rest of the decision is covered in our eFoil buying guide.