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72V 50Ah / 58Ah IP68 Waterproof Li-ion Battery Pack for Electric Surfboard — OEM/ODM Factory Direct

  • Configurations: 72V 50Ah (3,600Wh) / 72V 58Ah (4,176Wh) — two capacity options, same platform
  • Cell: 26650 cylindrical NCM, automotive-grade — 800 cycles @80% DOD
  • Peak Discharge: 200A continuous — supports 10–15kW motor systems
  • Waterproof: IP68 certified, tested to 20m continuous submersion
  • BMS: Japanese-IC, 6-point protection — OC / OD / OT / SC / cell balance
  • Underwater Hot Swap: Supported — magnetic switch + T-handle, no board removal needed
  • OEM/ODM: Voltage, capacity, connector, enclosure & IP rating fully customizable
  • Минимальный объем заказа: 5 units (standard) / 10 units (OEM custom) — samples ready in 5–7 business days

Описание продукта

The BLD-72V-IP68-ESB series is a purpose-built lithium-ion battery pack for performance-grade electric surfboards operating in open-water environments. Available in two configurations — 72V 50Ah (3,600Wh) and 72V 58Ah (4,176Wh) — both packs are built on 26650 cylindrical NCM cells and deliver sustained 200A discharge output to support 10–15kW motor systems without thermal throttling or voltage sag under full load.

The IP68-rated enclosure is tested for continuous submersion at 20 meters, with dual-layer silicone gaskets, pressure-sealed T-handle, and a magnetic switch that functions reliably in saltwater without corrosion. The 26650 NCM cell format is selected specifically for its higher energy density over 18650 at equivalent discharge rates — a requirement for compact marine enclosures where volume is fixed but runtime expectations are high.

Compatible surfboard and motor system references:

Platform / Motor System Номинальное напряжение Compatibility Notes
AdmitJet ST-ES12KW 72V Direct voltage match, 12kW motor
Lampuga / Lampuga Air 72V Connector & BMS current verified
Lift eFoil (High-Power) 72V Custom connector available via OEM
Waydoo Flyer EVO Series 72V CAN bus BMS integration available
Generic 10–15kW PWM ESC Systems 72V XT90 / Anderson connector options

All compatibility data is pre-sales reference. Connector pin-out and BMS protocol must be confirmed before bulk order. Sample units per your spec are available within 7 business days.

Технические параметры

Параметр 72V 50Ah (Standard) 72V 58Ah (High Capacity)
Номер модели. BLD-72V50A-IP68-ESB BLD-72V58A-IP68-ESB
Номинальное напряжение 72V 72V
Номинальная вместимость 50Ah (3,600Wh) 58Ah (4,176Wh)
Химия клеток NCM (Nickel Manganese Cobalt) NCM (Nickel Manganese Cobalt)
Cell Size 26650 Cylindrical 26650 Cylindrical
Full Charge Voltage 84.0V 84.0V
Cutoff Voltage 60.0V 60.0V
Cont. Discharge 200А 200А
Срок службы цикла ≥800 cycles @80% DOD ≥800 cycles @80% DOD
Waterproof Rating IP68 (20m continuous) IP68 (20m continuous)
Размеры 375 × 255 × 118 mm 375 × 255 × 130 mm (confirm with sample)
Масса 6.5 kg (14.33 lb) ~7.4 kg (confirm with sample)
Operating Temp. от -20°C до +60°C от -20°C до +60°C
Защита BMS OC / OD / OT / SC / Cell Balance OC / OD / OT / SC / Cell Balance
BMS IC Japanese IC (confirm brand) TOP Japanese IC
Сертификаты UN38.3, CE, RoHS UN38.3, CE, RoHS
OEM/ODM Supported Supported
Гарантия 12 месяцев 12 месяцев
Package Size 57 × 36 × 14 cm 57 × 36 × 16 cm (est.)
Место происхождения Гуандун, Китай Гуандун, Китай

Особенности и преимущества

⚡ 200A Continuous Discharge — Built for 10–15kW Motor Systems

At 72V nominal, 200A continuous output equals 14.4kW sustained power delivery. The 26650 NCM cells are specified for high-rate discharge without accelerated degradation — the BMS fuse threshold sits at 220A, giving motor systems full headroom under peak throttle without tripping protection. No derating at sea temperature.

🌊 IP68 to 20 Meters — Tested, Not Rated-on-Paper

IP68 means continuous submersion beyond 1 meter. This pack is verified to 20m. The enclosure uses dual-layer silicone gaskets with torque-controlled fasteners verified per IEC 60529. The magnetic switch and T-handle maintain watertight integrity under repeated thermal cycling between cold seawater and air — a real-world stress that cheaper IP65 housings fail in under 30 days of salt exposure.

🔄 Underwater Hot Swap — No Board-Out-of-Water Required

The T-handle and magnetic switch allow full battery replacement while the surfboard remains in the water. For rental operations running back-to-back sessions, eliminating the lift-dry-swap cycle translates directly to throughput. A fleet of 10 boards running 4 swaps per day saves approximately 3 hours of handling time daily compared to conventional battery designs.

🧠 6-Point BMS Protection — Japanese IC Chipset

Integrated BMS covers: over-charge (84.0V cutoff), over-discharge (60.0V cutoff), overcurrent (220A threshold), over-temperature (65°C shutoff), short-circuit (microsecond response), and active cell balancing. Hardware-level protection operates independently — no app, no Bluetooth dependency, no single point of failure in the protection chain.

🔋 26650 NCM Cells — 800 Cycles at 80% DOD

The 26650 cylindrical format delivers higher capacity per cell than 18650 at equivalent discharge rates, which matters in a fixed-volume marine enclosure. Rated at ≥800 cycles before capacity drops below 80% of nominal under IEC 61960 conditions. The 58Ah variant achieves 4,176Wh in the same footprint through additional parallel cell groups — not a larger enclosure.

🏭 OEM/ODM — 8 Fully Configurable Parameters

Submit a spec sheet and we configure: nominal voltage (24V–96V), capacity (10Ah–200Ah+), continuous discharge current, enclosure dimensions, waterproof grade (IP65/IP67/IP68), connector type (XT90, Anderson, custom pin), BMS communication protocol (UART, CAN, RS485), and branding. Engineering review: 48 hours. Sample turnaround: 5–7 business days. Production MOQ: 10 units.

Упаковка и доставка

UN38.3 wooden box packing for safe custom lithium battery pack transport.webp

Надежная и соответствующая стандартам упаковка

Для обеспечения безопасной транспортировки опасных грузов класса 9 каждая батарея защищена специальным составом. Высококачественная пенополиэтиленовая вата (EPE Foam) и заключенный в картонные коробки, сертифицированные ООН. Для оптовых поставок мы используем прочные материалы. Фанера или пластиковые поддоны Упаковано в термоусадочную пленку, полностью соответствует международным правилам транспортировки.

Варианты международной доставки (Инкотермс)

Мы предлагаем гибкие условия доставки, соответствующие потребностям вашего бизнеса, включая: Условия поставки: FOB, CIF и DDP (доставка от двери до двери, включая налоги)..

  • По морю: Наиболее экономичный вариант для оптовых заказов.
  • Авиа/экспресс-доставка: Быстрая доставка образцов (DHL/UPS/FedEx).
  • По железной дороге: Надежная служба экспресс-доставки CR Express на рынки Европы и Центральной Азии.

Сроки выполнения производственного заказа

Сроки выполнения заказа варьируются в зависимости от индивидуальных особенностей продукта:

Тип продукта Образцы Оптовый заказ
Стандартные модели 5-7 дней 14-20 дней
Индивидуальные модели 7–14 дней 14–28 дней

Глобальные стандарты безопасности и соответствие требованиям производителей оригинального оборудования.

При интеграции изготовленного на заказ литий-ионного аккумуляторного блока в ваше устройство соблюдение нормативных требований является обязательным. В Balder Power наши OEM-решения для аккумуляторных батарей разрабатываются с нуля и проходят строгие международные испытания на безопасность. Мы гарантируем, что ваши изготовленные на заказ блоки соответствуют стандартам CE, UL и IEC, а также предоставляем обязательные отчеты UN38.3 и MSDS, необходимые для бесперебойной международной доставки. От первоначального прототипирования до окончательной сертификации мы устраняем препятствия на пути к соблюдению нормативных требований, чтобы ускорить выход вашего продукта на рынок.

Часто задаваемые вопросы

Q1: What is the real continuous discharge current — can this battery sustain a 12kW motor?
Continuous discharge is 200A. At 72V nominal, that equals 14.4kW sustained output — sufficient for 10–15kW motor configurations without BMS cutoff. The short-circuit threshold sits at 220A, giving peak surge headroom without tripping protection. No derating is required at typical ocean water temperatures.
Q2: Is this battery safe for underwater use? What depth is the IP68 rating verified to?
IP68 is verified for continuous submersion at 20 meters. The enclosure uses dual-layer silicone gaskets with torque-controlled fasteners per IEC 60529. This rating holds through repeated thermal cycling between cold seawater and ambient air — the failure mode for most IP65-rated enclosures in saltwater environments. The pack is designed for surface watercraft operation, not repeated deep-pressure cycling.
Q3: How many cycles do the 72V 50Ah and 58Ah versions support before capacity degrades?
Both configurations use the same 26650 NCM cells with identical cycle ratings: ≥800 full cycles at 80% DOD before capacity falls below 80% of nominal. The 50Ah pack is rated 3,600Wh; the 58Ah pack is rated 4,176Wh. At 2 full cycles per day in commercial rental operation, both versions correspond to roughly 13–14 months before a capacity service interval. Partial discharge cycling extends this further.
Q4: What is the MOQ for standard and custom configurations?
Standard configurations (50Ah or 58Ah, no enclosure or connector changes): MOQ 5 units. OEM/ODM projects with custom voltage, capacity, connector, or enclosure: MOQ 10 units after sample approval. Sample units (1–2 pcs) are available for pre-order testing with a 5–7 business day lead time from Guangdong.
Q5: What parameters can be customized in an OEM order?
Eight parameters are fully configurable: nominal voltage (24V–96V), capacity (10Ah–200Ah+), continuous discharge current, enclosure dimensions and material, waterproof rating (IP65/IP67/IP68), connector type (XT90, Anderson, custom pin-out), BMS communication protocol (UART, CAN, RS485), and branding/labeling. Submit your spec sheet for a 48-hour engineering review and quotation.
Q6: What certifications does this battery carry, and what export documentation is available?
Standard packs ship with UN38.3 test report and CE/RoHS declaration of conformity. MSDS and packing list are included with every order. For air freight, IATA Packing Instruction PI965 documentation is provided. UL 1973, IEC 62133, and KC certifications are available on request for OEM projects with volume commitment.

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