XT60 vs XT90 vs Bullet Connectors: Choosing the Right RC Power Connector

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Introduction

If you’re into RC planes, drones, cars, or boats, you know how important reliable power connections are. The right connector ensures your batteries deliver power efficiently and safely to your motors and electronics. In this article, we’ll compare three popular connector types: XT60, XT90, and bullet connectors. We'll break down their features to help you pick the best option for your RC projects.

What Are These Connectors?

XT60 and XT90 connectors are popular, industry-standard connectors designed specifically for hobbyist RC applications. They’re made from high-temperature nylon and feature gold-plated contacts for excellent conductivity and durability.

Bullet connectors are simple cylindrical connectors often used in RC motors and ESCs. They come in various sizes (commonly 3.5mm, 4mm, and 5.5mm) and are easy to solder and assemble.

XT60 Connectors

XT60 connectors are rated for up to 60 amps continuous current, making them suitable for small to medium-sized RC models. They’re compact and lightweight, which is great for drones and smaller vehicles.

Pros:

  • Compact size
  • Reliable and secure connection
  • Gold-plated contacts reduce resistance
  • Polarised to prevent reverse connection

Cons: Limited to around 60 amps continuous current, so not ideal for very high-power setups.

XT90 Connectors

XT90 connectors are similar in design to XT60 but larger and rated up to 90 amps continuous current. They’re perfect for bigger RC planes, boats, or cars that draw higher current.

Pros:

  • Handles higher current loads (up to 90A)
  • Still relatively compact and lightweight
  • Secure, keyed design to prevent incorrect connection
  • Gold-plated contacts for low resistance

Cons: Slightly bulkier than XT60, which might be a factor if weight and space are critical.

Bullet Connectors

Bullet connectors are often used for motor leads and ESC connections. They’re available in various sizes, with 4mm and 5.5mm being popular for higher current applications.

Pros:

  • Easy to solder and assemble
  • Flexible, allowing for some movement and rotation
  • Available in different sizes to match current requirements
  • Widely used and compatible with many ESCs and motors

Cons:

  • Can be less secure than XT connectors—may disconnect if not properly fitted
  • Not polarised, so reverse connections are possible if not careful
  • Higher resistance if contacts aren’t clean or properly soldered

Which Connector Should You Choose?

Here’s a quick guide to help you decide:

  • Use XT60 if you’re building lightweight drones, small planes, or cars that draw under 60 amps.
  • Use XT90 for bigger, more powerful vehicles where current draw can go up to 90 amps or more.
  • Use bullet connectors primarily for motor and ESC connections or when you need some flexibility in the wiring. Make sure to choose the right size and ensure good soldering.

Tips for Safe and Efficient Connections

  • Always check the current rating of your connectors against your system’s needs.
  • Use quality connectors with gold-plated contacts to reduce resistance and heat buildup.
  • Make sure all solder joints are clean and solid to avoid power loss or connection failures.
  • Double-check polarity before powering up to avoid damaging your electronics.
  • Consider using heat shrink tubing to insulate exposed solder joints for safety.

Conclusion

Choosing the right connector for your RC power system makes a big difference in performance and reliability. XT60 connectors are great for smaller setups, XT90 are ideal for higher current systems, and bullet connectors offer flexible motor connections. By matching your connector to your current needs and ensuring good soldering technique, you’ll have a safer, more efficient RC project ready to hit the skies or tracks.

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