How to Choose a Battery Charger Connector: XLR, DC, Rosenberger Guide

Connector mismatch is the #1 cause of charger returns. This guide covers all common connector types.

1. 3-Pin XLR

The most common e-bike connector. Circular with 3 pins and a locking mechanism. Used on many standard e-bikes and scooters.

2. 4-Pin XLR

Similar to 3-pin but with an extra pin, often used for BMS communication. Common on QWIC e-bike systems.

3. DC Barrel Plug

Standard round connector. Sizes: 5.5x2.5mm or 5.5x2.1mm. Used on Xiaomi, Segway, Ninebot scooters. Always confirm the diameter.

4. Bosch Oval Plug

Proprietary oval-shaped 3-pin connector for Bosch e-bike systems (Active Line, Performance Line, Cargo Line).

5. Rosenberger Connector

Premium magnetic connector used on high-end e-bikes with BMZ battery systems. Known for secure connection and durability.

6. XT60 / XT90

Bullet-style connectors for high-current applications. XT60 up to 60A, XT90 up to 90A. Common on industrial and racing applications.

7. Aviation Plug

Multipin circular connector with screw-locking. Used on industrial and high-power chargers. Very secure connection.

How to Identify Your Connector

1. Take a clear photo of the connector
2. Check the original charger label
3. Send the photo to your supplier for identification

At Juxon, we can identify any connector type from a photo. Send us your connector photo.