The XT60 — the yellow nylon-housed bullet connector — became the de facto battery interconnect of drones, RC vehicles and portable power systems by being exactly right for its class: compact, polarized, gold-plated and honest for 60A-class current. This guide covers the connector and the cables built on it.
The XT60 Specification
The XT60's package: two 4mm gold-plated bullets in a nylon housing, polarized (male/female geometry prevents reversal — the connector family's core safety feature on battery leads), rated around 60A continuous (with honest derating by wire and cooling — the rating is the connector's, the system's is the weakest link), and rated for the LiPo-class voltage world (up to several-hundred-volt insulation margin covers all hobby power). Its success over the older T-connector and EC families: current class, polarization clarity, and ubiquity — every serious drone and RC power system speaks XT60.
Wire Pairing by Current
The cable is the connector's real current limit. Pairing practice: 12AWG silicone-jacketed fine-strand wire is the XT60's classic partner (short battery leads at 60A-class — silicone insulation handles the soldering heat and stays flexible at cold), 10AWG for sustained high loads, 14-16AWG for lower-current builds and longer runs with drop discipline (our voltage-drop guide's math applies — at battery voltage, every milliohm of lead resistance is flight time). Fine-strand high-count copper (silicone-wire class) matters: vibration and flex endurance on power leads that move every flight.
Assembly Practice
XT60 assembly is solder-first work: bullets pre-tinned and wire soldered into the bullet cups (flow clean, no cold joints — a high-current system's failure is heat at a bad joint), insulation and housing assembly with no conductor exposure at the housing seam, polarity verified before the second lead closes the circuit, and — production practice — pull-test verification and heat-shrink support at the wire exit. For volume production, the discipline is calibrated soldering process and 100% electrical verification (our battery cable guide covers the power-lead class).
XT60 vs XT90 and the Alternatives
- XT90: the 4.5mm big brother — 90A-class and the choice above XT60's comfort zone.
- EC5/EC3 (EC families): the competing bullet-family standard — equivalent class, ecosystem by brand loyalty.
- XT30: the 2mm small sibling for 30A-class builds.
- Anti-spark variants (XT60-S/XT90-S): resistor-aided engagement that kills the plug-in arc on high-capacitance battery systems — the upgrade worth specifying.
Selection Notes
- Current honestly derated by wire, length and cooling — the connector rating alone flatters the system.
- Polarization discipline on battery leads (reversal protection is the family's purpose).
- Genuine or quality-verified bullets (counterfeit plating wears and resistance climbs).
- Anti-spark for big-capacity packs.
Kaweei XT60 and Power Connector Assemblies
Kaweei manufactures XT60/XT90-class battery and power cable assemblies — soldered, pull-tested and electrically verified — for drone, RC and portable-power customers from our Dongguan facility. Contact our engineering team with your current class; our battery cable guide covers the power-lead discipline.