How to Choose the Best Battery for Your Bafang Electric Bicycle Conversion Kit ？

With the continued growth of electric bicycles in the global market, Bafang motor conversion kits have become the preferred solution for many bicycle brands, modifiers, and end-users due to their mature technology, stable performance, and wide compatibility. However, in practical applications, the choice of battery often directly determines the safety, range, and lifespan of the entire system.

Based on years of experience in eBike battery design and matching, this article provides a professional analysis of how to choose the truly suitable battery solution for your Bafang electric bicycle conversion kit.

Part 1: Why the Battery is the “Core Component” of the Bafang Conversion System

In the Bafang motor system, whether it’s a rear-wheel motor, a mid-drive motor, or a high-torque application scenario, the battery is not only the “energy source” but also the foundation for the stable operation of the system:

Determines the vehicle’s range

Affects the stability of motor output

Relates to the compatibility of the controller and BMS

Directly impacts vehicle safety and compliance

If the battery parameters do not match the Bafang motor, it may affect the riding experience, or in severe cases, lead to overcurrent protection, frequent power outages, or even safety hazards.

Part 2: Choosing the Right Voltage Platform Based on the Bafang Motor Model

Bafang conversion kits usually support multiple voltage platforms, and the recommended battery voltages for different models are as follows:

36V System

Suitable for urban commuting and light-assist riding, with gentle power output and stable range performance.

48V System

Commonly found in mid-drive motors and high-performance conversion solutions, offering stronger climbing ability and power response.

52V System (for some high-end applications)

Suitable for users seeking higher power output, requiring higher demands on the battery and BMS.

Recommandation :

Always choose a battery within the voltage range recommended by Bafang to avoid “low voltage with high power” or “overvoltage use,” which is essential for ensuring system lifespan and safety. Part 3: Capacity Selection:  Higher Capacity Isn’t Always Better

Battery capacity (Ah/Wh) determines the vehicle’s range, but in actual modifications, capacity selection requires considering multiple factors:

Riding distance and frequency of use

Motor power and riding mode

Vehicle weight and installation space

User needs for portability and appearance

Par exemple :

Daily commuters can choose 10Ah–14Ah

Long-distance or high-load riding may require 17Ah–20Ah or more

During the battery design phase, it’s crucial to match the appropriate capacity and discharge platform to different power levels of Bafang motors to ensure a balance between range, power, and safety.

Part 4: High Discharge Rate Capability: Matching Bafang Motor Instantaneous Power Requirements

Bafang motors require high instantaneous discharge capabilities from the battery during starting, acceleration, and climbing. If the battery’s discharge performance is insufficient, it may lead to:

Limited power output

Frequent BMS protection

Increased battery heating

In Bafang’s battery solutions:

Strictly selected high-performance power cells are used

The battery parallel structure is optimized

Ensuring continuous and peak discharge capabilities meet the motor’s requirements

This not only improves the riding experience but also effectively extends the overall battery life.

Part 5: BMS Compatibility: Ensuring System Stability and Safety

For Bafang modification kits, the battery management system (BMS) is not a “universal part.” A suitable BMS should have:

Good compatibility with the Bafang controller

Accurate overcharge, over-discharge, overcurrent, and short-circuit protection

Stable communication and response logic

Part 6: Structure and Installation Method: Balancing Aesthetics and Practicality

Common battery structures in Bafang modification projects include:

Batterie du tube inférieur

Porte-bagages arrière Batterie

In-tube/Hidden Battery

Yizhan Electronics fully considers the following in its structural design:

Compatibility with mainstream bicycle frames

Waterproof, shockproof, and heat dissipation performance

Quick installation and easy maintenance

Making the modified vehicle more balanced in terms of appearance, center of gravity, and practicality. Part 7: Choosing a Reliable Battery Manufacturer is Equally Crucial

For vehicle brands, modification companies, and channel customers, the manufacturing capabilities and quality system of the battery supplier are equally important:

Does the supplier possess complete independent manufacturing capabilities?

Does the supplier conduct rigorous consistency and aging tests?

Does the supplier support OEM/ODM customization?

Does the supplier meet international market safety and compliance requirements?

Conclusion

The performance of Bafang electric bicycle conversion kits relies on a highly compatible and reliable battery system. From voltage platform and capacity configuration to discharge capability, BMS compatibility, and structural design, every detail is crucial.

Yizhan Electronics Technology Co., Ltd. will continue to provide global customers with safer, more efficient, and more reliable eBike battery solutions through its professional manufacturing capabilities and application experience.