eFoil battery

How big is an eFoil battery?

Nothing on an eFoil weighs more than the battery, and no single part takes a bigger slice of what you pay. Today's full-size packs hold 2 to 2.6 kilowatt-hours and weigh about 13 to 19 kg. E-bikes give a useful sense of scale. Bosch's biggest bicycle battery, the PowerTube 800, holds 0.8 kWh, so on an eFoil you are standing on the energy of roughly three of them. The table below lists the current packs from the major brands, and every figure in it comes from official manufacturer data.

Those spare-pack prices explain why the battery, not the board, sets the value of a complete eFoil. At €2,400 to €5,000, a spare pack costs roughly a quarter to almost half of the price of a full set. The share runs 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). If you are shopping used, check battery condition first, before the cosmetics and before you look at which wings come in the box. Our guide to buying a used eFoil works through the checks in detail.

Set the capacity and weight columns side by side, divide one by the other, 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. These are figures for the whole pack, not for the bare cells inside it. You are comparing 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.

With the light packs the trade changes. Lift's LIFTX Light holds 0.54 kWh at 5.6 kg and Fliteboard's Flitecell Nano 806 Wh at 6.2 kg. At that weight the battery stops being a two-handed lift and becomes something you can carry down to the shore alongside the board. The price you pay for that is ride time. You also pay in efficiency, because a small pack still needs a full housing and a full set of connectors, and that fixed weight is spread over fewer cells.

Voltage is the other number to read, when a maker prints one. 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 a given power at lower current. That is an engineering decision, and not one you feel on the water. What does affect you is that packs and chargers are brand-specific. Nothing crosses between manufacturers.

Range: how long a charge lasts

Manufacturer promises cover a wide spread. The small batteries are rated for 25 to 60 minutes, the big packs for anywhere from an hour and a half to two and a half hours. 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. Those numbers are hard to compare, because hardly any brand says which rider and what speed produced them. SiFly prints its setup right next to the claim: a 75 kg rider, 15 km/h (roughly 9 mph) and a large wing.

Once you are out there, rider weight, speed, wing size and the state of the surface move ride time more than any printed figure. Fliteboard says as much in its own FAQ. The Flitecell Explore can run for more than two hours, it says, yet constant high speed or repeated touchdowns and restarts can empty it in under an hour. Cold also pulls capacity down. On an early-season session with water under 10 °C (50 °F), do not plan your afternoon around the summer figure. Our eFoil comparison table sets the published claims side by side.

The same battery can give two riders very different ride times. 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 only pushes a slim mast through the water, not 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, so a short first session says little about what the board can really do.

The published figure is a best case. Plan instead from what you get yourself on an ordinary day, in the water temperature you ride in, at your true weight with a wetsuit and a vest on. For a full day on the water, the only reliable answer is a second pack, and it is also the most expensive accessory you can add to the set.

Charging times and chargers

Charging needs nothing more than an ordinary wall socket, but it always has to be the brand's own charger on the other end. 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. What you get for the wait is a charger that 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 in its own right. 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. The Waydoo unit does something the others do not. Besides charging the pack, it draws 240-volt AC power back out of it, up to 1,500 W continuous by Waydoo's figures, so your board doubles as a power outlet at the water's edge.

Lift's own figures, spread across several of its pages, 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. Charging a large pack normally slows like this near the top of its range, and you can put that to use. If you want 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. Where charging costs you is in hardware and in time. 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 turns out to be the practical choice.

Charging safety

From one brand to the next the safety instructions barely differ, and you should follow them 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. After a session the battery needs to cool down before it goes on the cable, and charging has to 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. The rule exists because when a pack of this size does go wrong, it goes wrong fast, and the risk is not only to the battery but to 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, the manual that comes with the pack has the final word. Capacities, voltages and cell chemistries differ between brands, and so do the instructions that come with them. Read the manual properly once before the first charge, and then keep it wherever the charger lives so it is at hand. If a pack has taken a heavy impact, gone deeper than its rating allows, or just looks, sounds or smells wrong, that is a question for the manufacturer's service department and not something to settle on the charging shelf.

Battery life over the years: lifespan and warranty

It sounds strange, but no manufacturer publicly answers the obvious question of how much capacity is left after how many cycles. The warranty terms are what you get to see, and they 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 says it plainly: it treats the battery as a consumable and gives no capacity warranty, and the warranty that does exist depends on charging the pack at least every three months and keeping the firmware current. Fliteboard gives a plain 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. 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.

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. Lithium packs normally decline slowly and do not fail all at once, so the first sign is a session that ends earlier than it used to, while the board itself keeps working. Careful storage and the manufacturer's own charger are what stretch that curve out. If you are buying new, count the battery price in the total from the start. If you want full days on the water, a second pack belongs in the plan as well. We have run those numbers on the eFoil price page.

Flying and transport: the 160 Wh ceiling

A flight is where the battery becomes a problem. 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. eFoil packs hold roughly 500 to 2,600 Wh, which is 3 to 16 times the limit. The manufacturers are open about 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.

So 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. A flight leaves you two realistic options: ship the battery ahead as freight, or rent a board where you are going. That one constraint shapes travel plans more than most people expect. Settle it early, either by booking a board at the destination or by accepting that the flight and the foil are two separate trips.

Where you are allowed to 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 sets out the Spanish rules. For anyone still choosing between boards, the battery is the place to start. 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.