{"product_id":"foil-drive-fm-650-battery","title":"Foil Drive FM+ 650 Battery","description":"\u003csection class=\"supco-product-intro\"\u003e \u003cp\u003e\u003cstrong\u003eThe Foil Drive FM+ 650 Battery is the 648Wh Gen 2.5 battery designed for the Foil Drive Assist MAX+ and, with the correct FM+ Battery Adaptor, the Foil Drive Fusion.\u003c\/strong\u003e It gives MAX+ riders the highest-capacity battery option specified for the system, while giving Fusion riders a lighter alternative to the larger Fusion 860 when outright maximum runtime is not the priority.\u003c\/p\u003e\n\n\u003cp\u003eWith a 43.2V nominal voltage, 15Ah capacity and 648Wh of stored energy, the FM+ 650 is built for riders who want meaningful runtime for surf foiling, downwind runs, flat-water starts, wake riding, wing foiling and light eFoil use without automatically carrying the weight of the largest Fusion battery.\u003c\/p\u003e\n\n\u003cp\u003eJust as importantly, this is more than a larger battery pack. The Gen 2.5 design incorporates an intelligent battery-management system, Bluetooth communication, internal thermal management and an integrated nose cone within a one-piece moulded housing. The result is a battery designed specifically around the newer 43V Foil Drive platform.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eImportant compatibility note:\u003c\/strong\u003e the FM+ 650 is \u003cstrong\u003enot compatible with the previous 40V Foil Drive Assist MAX Gen 2\u003c\/strong\u003e. If you own an older Foil Drive system and are unsure which generation you have, contact us before ordering.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-positioning\"\u003e \u003ch2\u003eWhere does the Foil Drive FM+ 650 Battery fit in the range?\u003c\/h2\u003e\n\n\u003cp\u003eThe easiest way to understand the FM+ 650 is as the all-round battery at the centre of Foil Drive's new Gen 2.5 platform.\u003c\/p\u003e\n\n\u003cp\u003eOn \u003cstrong\u003eFoil Drive Assist MAX+\u003c\/strong\u003e, it is the main 648Wh battery and gives the system its combination of strong thrust, useful session length and relatively compact installed dimensions.\u003c\/p\u003e\n\n\u003cp\u003eOn \u003cstrong\u003eFoil Drive Fusion\u003c\/strong\u003e, the FM+ 650 provides another option. Fit the required FM+ Battery Adaptor and you can trade some of the Fusion 860's maximum capacity for a lighter battery underneath the board.\u003c\/p\u003e\n\n\u003cp\u003eThat makes it particularly interesting for Fusion riders who sometimes want the full 864Wh Fusion 860 for long powered sessions but would prefer less battery weight for surf, downwind or more performance-orientated foil-assist sessions.\u003c\/p\u003e\n\n\u003cp\u003eBrowse our wider \u003ca href=\"\/collections\/foil-assist\"\u003eFoil Drive and foil assist range\u003c\/a\u003e if you are building a complete setup rather than replacing or adding a battery.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-why-choose\"\u003e \u003ch2\u003eWhy choose the Foil Drive FM+ 650?\u003c\/h2\u003e\n\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003e648Wh capacity:\u003c\/strong\u003e substantial energy for repeated starts, longer surf sessions, upwind motoring and more time on the water.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e43.2V Gen 2.5 architecture:\u003c\/strong\u003e designed specifically around Foil Drive's newer MAX+ and Fusion platform.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eDirect MAX+ compatibility:\u003c\/strong\u003e the FM+ 650 is the principal high-capacity battery for Foil Drive Assist MAX+.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFusion compatibility:\u003c\/strong\u003e can be used with Foil Drive Fusion when paired with the correct FM+ Battery Adaptor.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3.95kg battery weight:\u003c\/strong\u003e approximately 0.95kg lighter than the 4.9kg Fusion 860 battery itself.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eStrong power deeper into the discharge:\u003c\/strong\u003e Gen 2.5 battery technology is designed to maintain full performance until around 10% state of charge before normal battery sag becomes more noticeable.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIntegrated smart BMS:\u003c\/strong\u003e communicates useful battery information with the Foil Drive V3 Controller and Foil Drive App.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInternal thermal management:\u003c\/strong\u003e helps regulate battery temperature for more consistent power delivery.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eIntegrated nose cone:\u003c\/strong\u003e the one-piece battery design removes the need for a separate nose cone.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eFast charging for its capacity:\u003c\/strong\u003e Foil Drive quote an average charge time of approximately 85 minutes with the correct 43V charger.\u003c\/li\u003e \u003c\/ul\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-real-world\"\u003e \u003ch2\u003eWhat does 648Wh mean in the real world?\u003c\/h2\u003e\n\n\u003cp\u003eBattery capacity is only useful when it suits the way you actually foil.\u003c\/p\u003e\n\n\u003cp\u003eA rider holding significant throttle through repeated flat-water starts will use considerably more energy than an experienced surf foiler who uses the motor for a few seconds to enter each wave. For that reason, we would not judge the FM+ 650 by one headline runtime figure alone.\u003c\/p\u003e\n\n\u003cp\u003eIts real strength is versatility. There is enough capacity to make MAX+ a genuinely useful all-round foil assist rather than a system intended purely for occasional short bursts, while the battery remains lighter and shorter than the Fusion 860.\u003c\/p\u003e\n\n\u003ch3\u003eSurf foiling\u003c\/h3\u003e \u003cp\u003eThe FM+ 650 makes particular sense for riders looking to increase wave count. You can motor out, reposition between peaks, use powered acceleration to enter weaker swell and recover more quickly after a fall without needing to conserve every second of motor use.\u003c\/p\u003e\n\n\u003ch3\u003eDownwind foiling\u003c\/h3\u003e \u003cp\u003eRepeated starts are one of the quickest ways to consume battery. The 648Wh capacity gives progressing downwind riders useful reserve for failed starts, resets and motoring back into position, while experienced riders can use shorter bursts to maximise overall session length.\u003c\/p\u003e\n\n\u003ch3\u003eFlat-water starts and pumping\u003c\/h3\u003e \u003cp\u003eFor flat-water training, a larger battery means more attempts before returning to shore. Rather than exhausting yourself repeatedly trying to generate board speed, Foil Drive can provide the initial acceleration and allow you to concentrate on foil control and pumping.\u003c\/p\u003e\n\n\u003ch3\u003eWing foiling\u003c\/h3\u003e \u003cp\u003eMAX+ with the FM+ 650 can provide reliable assistance through marginal wind, help smaller boards release and generate enough speed for the foil and wing to take over.\u003c\/p\u003e\n\n\u003ch3\u003eWake and swell riding\u003c\/h3\u003e \u003cp\u003eHaving power available on demand makes it considerably easier to accelerate onto passing wake or weak rolling swell, particularly when there is not enough natural energy for an unassisted start.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-runtime\"\u003e \u003ch2\u003eFoil Drive FM+ 650 runtime\u003c\/h2\u003e\n\n\u003cp\u003eFoil Drive provide the following indicative runtime figures for the FM+ 650. They are useful for comparison, but should not be treated as guaranteed session times.\u003c\/p\u003e\n\n\u003ctable\u003e \u003cthead\u003e \u003ctr\u003e \u003cth\u003eUse\u003c\/th\u003e \u003cth\u003eIndicative runtime\u003c\/th\u003e \u003c\/tr\u003e \u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eE-Foil \/ sustained powered use – intermediate rider\u003c\/td\u003e \u003ctd\u003eApproximately 31 minutes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eE-Foil \/ sustained powered use – advanced rider\u003c\/td\u003e \u003ctd\u003eApproximately 52 minutes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSurf foil – intermediate rider\u003c\/td\u003e \u003ctd\u003eApproximately 40–50 minutes\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eSurf foil – advanced rider\u003c\/td\u003e \u003ctd\u003eApproximately 55–70 minutes\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e\n\n\u003cp\u003eFoil Drive's comparison testing is based around an 80kg rider, 800cm² front wing and 5'0\" 40L board. The eFoil-style test uses flat water at approximately 70% throttle, while the surf test uses approximately 3ft swell and less than 5 knots of wind.\u003c\/p\u003e\n\n\u003cp\u003eYour own runtime can differ substantially. Rider weight, foil efficiency, board drag, propeller choice, motor height, current, sea state, water temperature, number of restarts and throttle use all make a difference.\u003c\/p\u003e\n\n\u003cp\u003eAn experienced surf foiler using five or ten seconds of motor assistance per wave may spend considerably longer on the water than a rider continuously using the motor to remain powered.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-max-plus\"\u003e \u003ch2\u003eFM+ 650 with Foil Drive Assist MAX+\u003c\/h2\u003e\n\n\u003cp\u003eThe FM+ 650 is particularly well matched to \u003cstrong\u003eFoil Drive Gen 2.5 Assist MAX+\u003c\/strong\u003e. The complete combination is designed to balance power, runtime and ride feel rather than simply maximise battery size.\u003c\/p\u003e\n\n\u003cp\u003eWith the FM+ 650 fitted, MAX+ has an installed battery-system length of approximately \u003cstrong\u003e540mm\u003c\/strong\u003e. The battery's integrated nose profile keeps the package clean and removes the separate nose-cone arrangement used on some previous-generation Foil Drive batteries.\u003c\/p\u003e\n\n\u003cp\u003eFor riders using MAX+ for surf, wing, wake, downwind and flat-water starts, this is the battery we would normally expect to sit at the heart of the system.\u003c\/p\u003e\n\n\u003cp\u003eIt is particularly suitable if you:\u003c\/p\u003e\n\n\u003cul\u003e \u003cli\u003ewant substantial runtime rather than the lightest possible assist setup;\u003c\/li\u003e \u003cli\u003eregularly perform multiple powered take-offs;\u003c\/li\u003e \u003cli\u003euse Foil Drive to motor between waves or bumps;\u003c\/li\u003e \u003cli\u003eare progressing and expect to need more restarts than an expert rider;\u003c\/li\u003e \u003cli\u003euse smaller boards or foils that require more acceleration;\u003c\/li\u003e \u003cli\u003ewant one battery capable of covering several different foil disciplines.\u003c\/li\u003e \u003c\/ul\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-fusion\"\u003e \u003ch2\u003eUsing the FM+ 650 with Foil Drive Fusion\u003c\/h2\u003e\n\n\u003cp\u003eThe FM+ 650 can also be fitted to \u003ca href=\"\/products\/foil-drive-fusion-complete-kit-3-blade-propeller\"\u003eFoil Drive Fusion\u003c\/a\u003e using the correct \u003cstrong\u003eFM+ Battery Adaptor\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eThis creates an interesting second configuration for Fusion owners.\u003c\/p\u003e\n\n\u003cp\u003eThe standard Fusion 860 battery has 864Wh capacity and weighs approximately 4.9kg. The FM+ 650 has 648Wh capacity and weighs approximately 3.95kg, making the battery itself around \u003cstrong\u003e0.95kg lighter\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eYou give up some maximum battery capacity, but for surf, downwind, wing and other sessions where board response matters more than the longest possible continuous runtime, that trade can make good sense.\u003c\/p\u003e\n\n\u003ctable\u003e \u003cthead\u003e \u003ctr\u003e \u003cth\u003eBattery\u003c\/th\u003e \u003cth\u003eFM+ 650\u003c\/th\u003e \u003cth\u003eFusion 860\u003c\/th\u003e \u003c\/tr\u003e \u003c\/thead\u003e \u003ctbody\u003e \u003ctr\u003e \u003ctd\u003eCapacity\u003c\/td\u003e \u003ctd\u003e648Wh\u003c\/td\u003e \u003ctd\u003e864Wh\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eAmp hours\u003c\/td\u003e \u003ctd\u003e15Ah\u003c\/td\u003e \u003ctd\u003e20Ah\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eNominal voltage\u003c\/td\u003e \u003ctd\u003e43.2V\u003c\/td\u003e \u003ctd\u003e43.2V\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBattery weight\u003c\/td\u003e \u003ctd\u003e3.95kg\u003c\/td\u003e \u003ctd\u003e4.9kg\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eBattery length\u003c\/td\u003e \u003ctd\u003e460mm\u003c\/td\u003e \u003ctd\u003e575mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003ctd\u003eMain strength\u003c\/td\u003e \u003ctd\u003eBalance of capacity and lower weight\u003c\/td\u003e \u003ctd\u003eMaximum Fusion runtime\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e\n\n\u003cp\u003e\u003cstrong\u003eFor Fusion installations, the FM+ Battery Adaptor is required and adds additional hardware to the complete installation.\u003c\/strong\u003e\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-smart-battery\"\u003e \u003ch2\u003eGen 2.5 smart battery technology\u003c\/h2\u003e\n\n\u003cp\u003eThe move to Gen 2.5 is important because the battery is now an active part of the wider Foil Drive electronics ecosystem rather than simply a reservoir of stored power.\u003c\/p\u003e\n\n\u003ch3\u003eIntelligent Bluetooth battery management\u003c\/h3\u003e \u003cp\u003eAn integrated battery-management system communicates with the Foil Drive V3 Controller and Foil Drive App. Compatible system information includes state of charge, battery identification and battery-health data, giving you a clearer view of what is happening inside the system.\u003c\/p\u003e\n\n\u003ch3\u003ePower deeper into the battery\u003c\/h3\u003e \u003cp\u003eThe Gen 2.5 architecture is designed to deliver full performance down to approximately 10% remaining charge before the normal reduction in output associated with a depleted lithium battery becomes more noticeable.\u003c\/p\u003e\n\n\u003cp\u003eThat matters most when you are using significant throttle. A battery that retains useful voltage under load makes the final part of a session much more predictable than one that begins to feel noticeably weaker much earlier in its discharge cycle.\u003c\/p\u003e\n\n\u003ch3\u003eInternal thermal management\u003c\/h3\u003e \u003cp\u003eThe battery incorporates thermal management intended to keep internal temperatures more stable during use. This helps support smooth, consistent power delivery across the session.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-construction\"\u003e \u003ch2\u003eOne-piece battery and integrated nose cone\u003c\/h2\u003e\n\n\u003cp\u003eThe FM+ 650 uses a one-piece moulded design that incorporates the battery and nose cone into a single unit.\u003c\/p\u003e\n\n\u003cp\u003eThis is useful for several reasons:\u003c\/p\u003e\n\n\u003cul\u003e \u003cli\u003ethere is no separate battery nose cone to select or fit;\u003c\/li\u003e \u003cli\u003ethe external shape is designed around smoother water flow;\u003c\/li\u003e \u003cli\u003efewer separate external components simplify installation;\u003c\/li\u003e \u003cli\u003ethe battery mass is positioned around the foil's centre of lift;\u003c\/li\u003e \u003cli\u003ethe sealed construction is designed for demanding marine use.\u003c\/li\u003e \u003c\/ul\u003e\n\n\u003cp\u003eThe battery is rated to \u003cstrong\u003eIP69 water and dust resistance\u003c\/strong\u003e. As with every electric watersports product, that does not remove the need for correct inspection, connection care, rinsing, drying and storage after use.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-charging\"\u003e \u003ch2\u003eCharging the Foil Drive FM+ 650\u003c\/h2\u003e\n\n\u003cp\u003eThe FM+ 650 must be charged using the correct \u003cstrong\u003e43V Foil Drive charger\u003c\/strong\u003e used by the Gen 2.5 MAX+ and Fusion platform.\u003c\/p\u003e\n\n\u003cp\u003eFoil Drive quote an average charge time of approximately \u003cstrong\u003e85 minutes\u003c\/strong\u003e.\u003c\/p\u003e\n\n\u003cp\u003eThe compatible charging system also supports Storage Mode, which is useful if the battery will not be used for an extended period.\u003c\/p\u003e\n\n\u003cp\u003eFoil Drive recommend storing the battery at approximately \u003cstrong\u003e30–60% state of charge\u003c\/strong\u003e rather than leaving it fully charged or deeply discharged for long periods.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eA charger is not included with this standalone FM+ 650 Battery.\u003c\/strong\u003e A suitable 43V charger is supplied with complete compatible MAX+ and Fusion systems, or should be purchased separately if required.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-compatibility\"\u003e \u003ch2\u003eFoil Drive FM+ 650 compatibility\u003c\/h2\u003e\n\n\u003ch3\u003eCompatible with\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eFoil Drive Gen 2.5 Assist MAX+\u003c\/li\u003e \u003cli\u003eFoil Drive Fusion when used with the correct FM+ Battery Adaptor\u003c\/li\u003e \u003cli\u003eFoil Drive 43V charging system\u003c\/li\u003e \u003cli\u003eFoil Drive Battery Caddy when used with the appropriate FM+ Battery Adaptor\u003c\/li\u003e \u003cli\u003eFoil Drive V3 Controller and compatible Foil Drive App functions when installed within the appropriate system\u003c\/li\u003e \u003c\/ul\u003e\n\n\u003ch3\u003eNot compatible with\u003c\/h3\u003e \u003cul\u003e \u003cli\u003eFoil Drive Assist MAX Gen 2 40V systems\u003c\/li\u003e \u003cli\u003eOlder Gen 2 MAX batteries and chargers simply because they share the MAX name\u003c\/li\u003e \u003cli\u003eFoil Drive Assist Slim battery installations\u003c\/li\u003e \u003cli\u003eGen 1 Assist or Assist Plus battery systems\u003c\/li\u003e \u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eDo not choose a Foil Drive replacement battery based only on its physical appearance or connector.\u003c\/strong\u003e Voltage, battery-management architecture and system generation must all match.\u003c\/p\u003e\n\n\u003cp\u003eIf you are uncertain whether you own a Gen 2 MAX, Gen 2.5 MAX+ or Fusion, contact The SUP Company with a photograph of your electronics unit and existing battery before ordering.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-specifications\"\u003e \u003ch2\u003eFoil Drive FM+ 650 Battery specifications\u003c\/h2\u003e\n\n\u003ctable\u003e \u003ctbody\u003e \u003ctr\u003e \u003cth\u003eProduct\u003c\/th\u003e \u003ctd\u003eFoil Drive FM+ 650 Battery\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eGeneration\u003c\/th\u003e \u003ctd\u003eGen 2.5\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eFoil Drive SKU\u003c\/th\u003e \u003ctd\u003eFD401\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eGTIN\u003c\/th\u003e \u003ctd\u003e9361123003493\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eBattery type\u003c\/th\u003e \u003ctd\u003eRechargeable lithium-ion\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eRated capacity\u003c\/th\u003e \u003ctd\u003e648Wh\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eAmp hours\u003c\/th\u003e \u003ctd\u003e15Ah\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eNominal voltage\u003c\/th\u003e \u003ctd\u003e43.2V\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eMaximum voltage\u003c\/th\u003e \u003ctd\u003e50.4V\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eBattery weight\u003c\/th\u003e \u003ctd\u003e3.95kg\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eBattery dimensions\u003c\/th\u003e \u003ctd\u003e460 x 125 x 55mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eInstalled dimensions with MAX+\u003c\/th\u003e \u003ctd\u003e540 x 125 x 55mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eInstalled dimensions with Fusion\u003c\/th\u003e \u003ctd\u003eApproximately 658 x 125 x 55mm\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eNose cone\u003c\/th\u003e \u003ctd\u003eIntegrated – separate nose cone not required\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eWater and dust resistance\u003c\/th\u003e \u003ctd\u003eIP69\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eAverage charge time\u003c\/th\u003e \u003ctd\u003eApproximately 85 minutes with the correct 43V charger\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eRecommended storage charge\u003c\/th\u003e \u003ctd\u003eApproximately 30–60%\u003c\/td\u003e \u003c\/tr\u003e \u003ctr\u003e \u003cth\u003eCertifications\u003c\/th\u003e \u003ctd\u003eUN38.3, CE, FCC, WEEE, RoHS, PSE, IP68 and IP69\u003c\/td\u003e \u003c\/tr\u003e \u003c\/tbody\u003e \u003c\/table\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-package\"\u003e \u003ch2\u003eWhat's included?\u003c\/h2\u003e\n\n\u003cul\u003e \u003cli\u003e1 x Foil Drive FM+ 650 Battery\u003c\/li\u003e \u003cli\u003e1 x FM+ 650 Battery Carry Case\u003c\/li\u003e \u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eNot included:\u003c\/strong\u003e Foil Drive electronics unit, motor, controller, 43V charger, Fusion FM+ Battery Adaptor, Battery Caddy, foil, mast or board unless specifically stated as part of a separate package.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-care\"\u003e \u003ch2\u003eLooking after your Foil Drive battery\u003c\/h2\u003e\n\n\u003cp\u003eA Foil Drive battery is a substantial part of the value of the complete system, so sensible battery care is worth making part of your normal post-session routine.\u003c\/p\u003e\n\n\u003cul\u003e \u003cli\u003eUse only the correct Foil Drive 43V charging equipment.\u003c\/li\u003e \u003cli\u003eInspect the battery and electrical connections before every session.\u003c\/li\u003e \u003cli\u003eDo not use a battery that has suffered significant impact, swelling or visible damage.\u003c\/li\u003e \u003cli\u003eKeep electrical contacts clean and maintain them according to Foil Drive's instructions.\u003c\/li\u003e \u003cli\u003eRinse and dry your complete Foil Drive installation correctly after salt-water use.\u003c\/li\u003e \u003cli\u003eAllow equipment to dry before closing it into storage.\u003c\/li\u003e \u003cli\u003eAvoid leaving the battery fully charged for prolonged periods.\u003c\/li\u003e \u003cli\u003eFor longer-term storage, aim for approximately 30–60% state of charge.\u003c\/li\u003e \u003cli\u003eFollow the battery and charger manuals supplied with your Foil Drive system.\u003c\/li\u003e \u003c\/ul\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-buying-advice\"\u003e \u003ch2\u003eOur advice: should you buy the FM+ 650?\u003c\/h2\u003e\n\n\u003cp\u003eIf you own \u003cstrong\u003eFoil Drive MAX+\u003c\/strong\u003e and want a main or spare battery with serious useful capacity, the answer is straightforward: the FM+ 650 is the battery specifically designed around that role.\u003c\/p\u003e\n\n\u003cp\u003eFor \u003cstrong\u003eFusion\u003c\/strong\u003e owners, the decision is more nuanced. The FM+ 650 is particularly attractive when you want to reduce battery weight for surf, downwind, wing or performance-focused sessions and do not need all 864Wh of the Fusion 860 every time you ride.\u003c\/p\u003e\n\n\u003cp\u003eIf maximum session length, repeated learning attempts or prolonged powered riding are the priority, the larger Fusion 860 remains the more logical Fusion battery.\u003c\/p\u003e\n\n\u003cp\u003eBattery choice becomes much easier when we know:\u003c\/p\u003e\n\n\u003cul\u003e \u003cli\u003ewhich Foil Drive system you own;\u003c\/li\u003e \u003cli\u003eyour rider weight;\u003c\/li\u003e \u003cli\u003eyour board and foil;\u003c\/li\u003e \u003cli\u003eyour main riding discipline;\u003c\/li\u003e \u003cli\u003ewhether you use the motor mainly for take-offs or sustained power;\u003c\/li\u003e \u003cli\u003ehow much battery you normally use during a session.\u003c\/li\u003e \u003c\/ul\u003e\n\n\u003cp\u003eIf you are still deciding between complete systems, see the \u003ca href=\"\/products\/foil-drive-fusion-complete-kit-3-blade-propeller\"\u003eFoil Drive Fusion Complete Kit\u003c\/a\u003e or browse our \u003ca href=\"\/collections\/foil-assist\"\u003efoil assist collection\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eIf foil assist is completely new to you, our \u003ca href=\"\/blogs\/news\/foil-assist-explained-foil-drive-vs-duotone-vs-waydoo-the-sup-co\"\u003efoil assist explained guide\u003c\/a\u003e covers the different approaches and helps put Foil Drive into context.\u003c\/p\u003e \u003c\/section\u003e\n\n\u003csection class=\"supco-faq\"\u003e \u003ch2\u003eFoil Drive FM+ 650 Battery FAQs\u003c\/h2\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eWhat is the capacity of the Foil Drive FM+ 650?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eThe FM+ 650 has a rated capacity of 648Wh or 15Ah at a nominal 43.2V.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eWhich Foil Drive systems use the FM+ 650?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eIt fits Foil Drive Gen 2.5 Assist MAX+ directly. It can also be used with Foil Drive Fusion when the correct FM+ Battery Adaptor is installed.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eWill the FM+ 650 fit my older Foil Drive Assist MAX Gen 2?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eNo. The FM+ 650 belongs to the newer 43.2V Gen 2.5 architecture and is not compatible with the previous 40V Assist MAX Gen 2 system.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eIs the FM+ 650 the main battery for Foil Drive MAX+?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eYes. The 648Wh FM+ 650 is the high-capacity battery specified for the Gen 2.5 Assist MAX+ platform.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eCan I use the FM+ 650 with Foil Drive Fusion?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eYes, but you need the correct FM+ Battery Adaptor. It is not a direct battery swap without the required Fusion installation hardware.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eWhy would I use the FM+ 650 instead of the Fusion 860?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eThe FM+ 650 battery weighs approximately 3.95kg compared with 4.9kg for the Fusion 860 battery. It therefore gives a Fusion owner a lighter 648Wh option when outright maximum runtime is less important than reducing battery weight. The required FM+ Battery Adaptor adds some additional installation hardware.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eHow much does the Foil Drive FM+ 650 weigh?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eThe battery weighs approximately 3.95kg.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eHow long does the FM+ 650 last?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eFoil Drive's controlled examples range from approximately 31–52 minutes for sustained eFoil-style riding and approximately 40–70 minutes for surf use. These are indicative figures only. Rider weight, foil, board, conditions, motor position and throttle use can change runtime considerably.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eHow long does the FM+ 650 take to charge?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eFoil Drive quote an average charging time of approximately 85 minutes when using the correct 43V charging system.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eDoes the FM+ 650 come with a charger?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eNo. This standalone battery includes the FM+ 650 and its carry case. A compatible 43V Foil Drive charger is required and is supplied with compatible complete MAX+ and Fusion systems.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eDoes it need a separate nose cone?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eNo. The nose cone is integrated into the one-piece FM+ 650 battery housing.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eWhat charge level should I store the FM+ 650 at?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eFoil Drive recommend approximately 30–60% state of charge for longer-term storage rather than leaving the battery fully charged or deeply discharged.\u003c\/p\u003e \u003c\/details\u003e\n\n\u003cdetails\u003e \u003csummary\u003e\u003cstrong\u003eCan The SUP Company check whether this battery fits my Foil Drive?\u003c\/strong\u003e\u003c\/summary\u003e \u003cp\u003eYes. If you are unsure which generation you own, send us photographs of your Foil Drive electronics unit and existing battery. We would much rather confirm compatibility before you order than have you discover afterwards that you have a different voltage or system generation.\u003c\/p\u003e \u003c\/details\u003e \u003c\/section\u003e","brand":"Foil Drive","offers":[{"title":"Default Title","offer_id":54707652264269,"sku":"FD401","price":1119.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0904\/8381\/8829\/files\/foil-drive-fd401-fm-plus-650-battery-carry-case.jpg?v=1790088488","url":"https:\/\/www.thesupco.com\/products\/foil-drive-fm-650-battery","provider":"The SUP Company","version":"1.0","type":"link"}