High Capacity eFoil Battery Packs

At CM Batteries, we are a trusted leader in designing custom battery packs for efoils, engineered for maximum performance and safety. Our solutions are integrated with smart Battery Management Systems (BMS) to effectively address thermal regulation and short circuit issues, ensuring reliable and efficient operation in demanding aquatic environments.

Whether you’re looking for extended runtime, lightweight designs, or optimized thermal management, CM Batteries delivers tailored solutions that push the boundaries of performance for efoil enthusiasts.

Our custom eFoil battery packs are designed to include a waterproof enclosure, BMS, and battery pack assembly with advanced technology.

BMS with Pre-discharge Function

When the battery pack is first connected, the load circuit may contain large capacitors. Directly connecting the battery can cause a high current surge, potentially damaging the battery, load, or related components. To address this, the BMS uses a current-limiting circuit (e.g., a resistor) to perform a low-current discharge for a short time (typically 1 to 3 seconds).

When the discharge current is excessively high, a large number of lithium ions must pass rapidly through the SEI (Solid Electrolyte Interphase) layer, which can disrupt its structure. The resistance of the SEI layer increases, affecting the battery’s performance.The insulating properties of the SEI layer deteriorate, leading to compromised battery safety.

Waterproof Enclosure

Each efoil brand and model comes with its specific requirements for battery packs. At CM Batteries, our engineering team is dedicated to designing custom waterproof enclosures with an IP68 rating and waterproof connectors that support high-discharge currents.

Advanced Battery Pack Assembly Workcraft

We also provide customized nickel sheets, battery holders, and insulation materials like red paper to enhance the reliability of your efoil battery packs.

Additionally, our Process Engineering (PE) team will meticulously optimize the production workflow for your efoil battery packs with every order, ensuring maximum efficiency, durability, and performance.

eFoil Battery Pack Solution

CMB eFoil battery design with Li ion 18650 Battery Pack and Li ion 21700 Battery Pack.

50.4V 50Ah eFoil Battery Pack
Product Highlights ：

High Capacity: 50Ah for extended ride times
Advanced BMS: Integrated smart Battery Management System with protections against overcharging, short circuits, and overheating.
High Discharge Capability: Customized to meet the high-current demands of efoil motors.
IP68 waterproof connector with pre-discharge function.

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43.2V 40Ah 14S10P eFoil Battery Pack
Product Highlights:

Samsung INR21700-40T cell
Heat dissipation for high discharge current
Pre-discharge function with the special BMS management strategy
Waterproof level: IP68
Protection: over-discharge, overcharge, over-current, and short-circuit protection

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Technical Articles Related to eFoil Batteries

21700 VS 18650 Batteries for Real-world Applications

Optimizing Electric Surfboard Battery Performance with Smart BMS

The Lithium Battery Calculator Guidance

The Role of C-Rating in Lithium-Ion Battery Pack Design

Efoil Battery Pack FAQ

What voltage do you recommend for eFoil batteries?

Recommended voltages for eFoil batteries range from 36V to 58.8V. A higher voltage provides more power to your electric surfboard. Please consult with your dedicated CMB advisor to determine the best voltage for your electric surfboard’s battery pack.

How long will a charged CM electric surfboard battery run for before having to be recharged?

A number of factors influence how long a custom battery pack will run for in an electric surfboard, including battery capacity and engine wattage. When designing your electric surfboard, confirm the specifications of your custom battery pack first to ensure enough space is provided in the electric surfboard’s design for optimal battery performance and safety.

What is the timeline for designing and manufacturing a custom battery pack for an electric surfboard?

Every custom battery pack is uniquely designed and manufactured to suit the needs of the specific electric surfboard it will be giving power to. A standard development and production timeline is below for general reference, but times may vary.

Battery pack design confirmation: 7 business days

Prototype production: 15 business days

Prototype shipment: 4-6 business days

Open mold for battery case: 4-5 weeks

Bulk manufacturing: 25-30 business days

Certificates approval: 25-90 business days

What types of Battery Management Systems (BMS) does CM offer for electric surfboard batteries?

Our electric surfboard batteries include BMS’s with overcharge protection, over-discharge protection, and short circuit protection. We also offer Smart BMS options by incorporating UART or CANBUS communication protocols into the BMS design. Smart BMS’s ensure the battery is operating in the safest and most optimal manner, and may also prolong battery life.

What is the Development time for your Electric Surfboard Battery Pack?

Do electric surfboard batteries need to be waterproof?

Whether or not a battery’s casing needs to be waterproof depends on the design of the specific electric surfboard it’s providing power to. Some of our customers do not require a waterproof battery pack because the design of their surfboard is waterproof and ensures the battery’s protection from the elements. That being said, the recommended choice for optimal safety and battery longevity is to go with a battery case design with a waterproof rating of IP68, which CM offers.

How do I obtain the specs for my CMB custom battery pack?

CM Batteries has designed battery packs for the electric surfboard for international efoil company. Once your OEM electric surfboard battery design is completed, your design consultant will release the speciﬁc eFoil battery specs to you.