Quick Answer
FPV drones use XT30, XT60, or XT90 battery connectors rated for different current loads. XT30 handles bursts up to 30A for whoops and micros. XT60 handles bursts up to 60A for most 5-inch builds. XT90 and AS150 serve heavy-lift and cinelifter rigs. Using the wrong connector causes voltage sag, melted plugs, and in the worst case, a fire. We use XT60 on every 5-inch build in our workshop.
The Melted Connector We Found on a Customer Build
A customer sent in a 5-inch freestyle quad that kept cutting out mid-flight. When we unplugged the battery, the XT30 connector came apart in two pieces. The plastic had softened from sustained heat and the contact resistance had climbed enough to starve the ESCs under full throttle. A 10-minute resolder to XT60 fixed it completely.
We have replaced at least a dozen melted connectors in the last year, most on builds where someone reused a whoop's XT30 on a 5-inch frame. The fix is always the same: match the connector to the current draw.
XT30, XT60, XT90: Current Ratings and When to Use Each
| Connector | Continuous | Burst | Typical Use |
|---|---|---|---|
| XT30 | 15A | 30A | Whoops, micros, 2S-3S |
| XT30U | 30A | 45A | Whoops on 3S, micro long-range |
| XT60 | 30A | 60A | 5-inch freestyle/racing, 4S-6S |
| XT90 | 45A | 90A | 7-inch, long-range, cinelifter |
| AS150 | 150A | 200A+ | Large cinelifter, dual-battery |
These numbers come from AMASS, the manufacturer. The name of each connector refers to its burst rating. In FPV, where full-throttle bursts rarely last more than a few seconds, the burst rating is the practical limit. For a typical 5-inch freestyle build on 6S pulling 40-60A at full throttle, XT60 is the right choice. It ships on nearly every flight stack and battery we sell. We stock XT30U connectors in packs of 10 for whoop builders and a connector set with XT60, T-plug, and EC3 with silicone wire and heat shrink. Browse our full range in the connectors collection.
Why Current Ratings Are Not Suggestions
Pushing 50A through an XT30 creates a feedback loop: resistance generates heat, plastic softens, contacts lose tension, resistance rises further. We see this when someone upgrades a whoop battery without changing the connector. A 75mm whoop on 2S might draw 8A. On a hot 3S with 1102 motors it can spike to 40A, right at the XT30 limit.
For stepping up from XT60, we recommend the XT90 to XT60 adapter for transitioning between battery types. We also stock XT30 to XT60 adapters. See our power distribution guide for the full picture on power flow.
Soldering Battery Connectors the Right Way
A badly soldered connector is as dangerous as an undersized one. Use at least a 60W iron with a chisel tip. A 30W pencil iron cannot heat XT60 fast enough for a good joint before the housing deforms. Tin both the pin and wire, add flux, then hold the iron on the pin until both solder blobs merge. Hold the wire still for three seconds. Any movement during cooling creates a cold joint with high resistance. Cover with heat shrink. Always verify polarity: positive goes to the marked side. See our battery voltage sag guide for how poor connectors contribute to brownouts.
Anti-Spark Connectors and When to Use Them
On 6S or higher, plugging in a battery creates a visible spark that erodes contact surfaces. Anti-spark XT90 connectors have a secondary contact with a resistor that pre-charges the capacitors before the main connection. We recommend them on any 6S build with low-ESR capacitors. Under CAA regulations, a failed battery connector in flight counts as a loss of control event. A proper connector, correctly soldered, is a safety obligation.
FAQ
Q: Can I use XT60 on a whoop build?
A: You can, but it adds weight and bulk. XT30 is lighter and adequate for whoops drawing under 30A. Save XT60 for 3-inch and larger builds.
Q: My XT60 is hard to unplug. Is that normal?
A: Yes, they are intentionally tight. Hold wires close to the connector and pull with a twisting motion. Never pull by the wire.
Q: Should I use EC3, EC5, or T-plug instead of XT60?
A: We do not recommend them for new builds. XT60 is the FPV standard. EC3 and EC5 are fine electrically but less common in FPV. T-plug connectors have limited current capacity and loose tolerances.
Q: What wire gauge should I use with each connector?
A: For XT30: 18-20AWG. For XT60: 12-14AWG. For XT90: 10-12AWG. In our workshop, we use 14AWG silicone wire on XT60 leads for 5-inch builds and 12AWG for 6S racing setups that see 70A bursts.
Q: Can I cut and resolder a battery connector?
A: Yes, but only do one wire at a time. Cut negative first, solder the new connector, insulate with heat shrink, then do positive. Never cut both wires simultaneously.