{"product_id":"foil-drive-fm-650-battery","title":"Foil Drive FM+ 650 Battery","description":"\u003cp\u003e\u003cstrong\u003eThe \"go to\" battery for both Gen2.5 units — and it moves between them.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe FM+ 650 sits at the intersection of runtime, weight and cost, and is the go-to battery option for both the Gen2.5 Fusion and the MAX+. With 648Wh of capacity, Foil Drive's 43V architecture unlocks powerful, consistent thrust and endurance — for extended surf sessions, upwind and downwind runs, wake riding, pumping, flatwater starts and light eFoiling.\u003c\/p\u003e\n\u003cp\u003eBecause it works across both the Fusion and the MAX+, one battery moves between two very different setups. For MAX+ riders this is your highest capacity battery, with plenty of runtime for a full surf session. Fusion riders simply add the FM+ Battery Adaptor for a lighter, more manoeuvrable alternative to the 860.\u003c\/p\u003e\n\u003ch2\u003eDetails\u003c\/h2\u003e\n\u003cp\u003eGen2.5 battery technology lets you use more of the battery. It performs deeper into the cycle, so on the water you get full power delivery right down to around 10% before you start to notice the sag that every battery eventually shows.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCharging.\u003c\/strong\u003e The FM+ 650 needs a 43V charger, which is supplied with your Fusion or MAX+ system. It averages an 85 minute charge, and includes a Storage Mode that limits charging so you can store the battery for long-term health. We'd recommend storing between 30 and 60% state of charge.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSmart BMS.\u003c\/strong\u003e An intelligent Bluetooth battery management system feeds accurate data to the V3 Controller for clear percentage and status readouts. It also connects to the Foil Drive App, where you can name each battery, track its health and check its state of charge — handy for checking the surf cam and your charge level without getting out of bed.\u003c\/p\u003e\n\u003ch2\u003eTech Specs\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRated capacity:\u003c\/strong\u003e 648Wh\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmp hours:\u003c\/strong\u003e 15Ah\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNominal voltage:\u003c\/strong\u003e 43.2V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum voltage:\u003c\/strong\u003e 50.4V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery weight:\u003c\/strong\u003e 3.95kg (8.70lbs)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery dimensions:\u003c\/strong\u003e L460 x W125 x H55mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstalled dimensions:\u003c\/strong\u003e 540 x 125 x 55mm with the MAX+, 658 x 125 x 55mm with the Fusion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNose cone:\u003c\/strong\u003e not required — integrated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery type:\u003c\/strong\u003e lithium-ion\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWater rating:\u003c\/strong\u003e IP69 water and dust resistance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCertification:\u003c\/strong\u003e UN38.3, CE, FCC, WEEE, RoHS, PSE, IP68, IP69\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eIndicative runtimes\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eeFoil, intermediate: ~31 minutes*\u003c\/li\u003e\n\u003cli\u003eeFoil, advanced: ~52 minutes*\u003c\/li\u003e\n\u003cli\u003eSurf, intermediate: ~40–50 minutes**\u003c\/li\u003e\n\u003cli\u003eSurf, advanced: ~55–70 minutes**\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eRuntime varies a lot with skill, weight, gear sizing and conditions — treat these as a guide based on real-world averages.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e*Based on an 80kg rider, 800cm² wing, 5'0 40L board, throttle around 70%. The intermediate rider has many touchdowns and multiple falls and restarts; the advanced rider has none.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e**Based on an 80kg rider, 800cm² wing, 5'0 40L board in 3ft swell with under 5kts of wind. The intermediate rider has high motor reliance and isn't pumping between waves, with many falls and restarts; the advanced rider has medium motor reliance, links some waves by pumping, and has minimal falls.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFM+ 650 Battery\u003c\/li\u003e\n\u003cli\u003eFM+ 650 Battery carry case\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompatible With\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eFoil Drive Assist MAX+\u003c\/li\u003e\n\u003cli\u003eFoil Drive Fusion (with the FM+ Battery Adaptor)\u003c\/li\u003e\n\u003cli\u003e43V Standard Charger\u003c\/li\u003e\n\u003cli\u003eFoil Drive Battery Caddy (with the FM+ Battery Adaptor)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNot compatible with the Gen2 Assist MAX, which runs 40V.\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eExpert Advice:\u003c\/strong\u003e This is the battery that finally makes a two-system quiver sensible — buy one, run it on the MAX+ and on a Fusion, or share it with a mate running the other unit. If you're on a Fusion already, remember you'll need the FM+ Battery Adaptor as well; Fusions bought before 23 September 2026 don't include it. Store it at 30–60% between sessions and it will look after you.\u003c\/p\u003e\n\u003cp\u003eIt is important to properly care for your Foil Drive battery. \u003ca href=\"https:\/\/help.foildrive.com\/en-US\/lithium-battery-use-care-and-storage-204637\" target=\"_blank\" rel=\"noopener\"\u003eClick here to learn about lithium battery use, care and storage.\u003c\/a\u003e\u003c\/p\u003e\n\u003cdiv class=\"fd-delivery\" style=\"border:1px solid #e0e0e0;background:#f7f7f7;border-radius:8px;padding:12px 16px;margin-top:16px;\"\u003e\n\u003cstrong\u003eDelivery: approximately 7 days.\u003c\/strong\u003e This item is ordered in from Foil Drive for you. We’ll confirm timings as soon as your order is placed – and if you need it sooner, get in touch and we’ll see what we can do.\u003c\/div\u003e","brand":"Foil Drive","offers":[{"title":"Default Title","offer_id":55660215796088,"sku":"FD401","price":1120.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0555\/0653\/4457\/files\/FD401-Fusion-MAX_-650-Battery.jpg?v=1789378191","url":"https:\/\/morwatersports.com\/products\/foil-drive-fm-650-battery","provider":"Môr Watersports","version":"1.0","type":"link"}