How to Wire XT60 Connectors

XT60 connectors are the standard power connector for LiPo battery packs, ESCs, and power distribution boards across the RC and drone hobby. If you have opened a new battery pack or ESC and found bare wire leads instead of a connector, or a connector has broken off after a hard landing, soldering on a new XT60 is a basic skill worth learning properly. A weak or cold solder joint on a high-current connector is a common cause of intermittent power loss, overheating, and in the worst case, a fire.

This guide covers what an XT60 connector is, the widely used male/female convention (and why it is not a strict rule), the tools and wire gauge you need, a full step-by-step soldering procedure, the mistakes that cause most connector failures, how series and parallel battery wiring works, and the LiPo-specific safety practices to follow every time you solder near a battery.

What Is an XT60 Connector?

An XT60 connector is a two-pin "bullet style" DC power connector rated for 60A continuous current. The name refers to the 6mm pin diameter and approximate current rating. It is part of a family of connectors sharing the same bullet-and-socket design at different sizes:

XT30 -- smaller, roughly rated around 30A, common on smaller drones and low-current accessories.
XT60 -- the connector covered in this guide, rated around 60A continuous.
XT90 -- larger, roughly rated around 90A, used on high-power builds that draw more current than an XT60 can safely handle.

XT60 connectors are used almost everywhere in the RC and drone world: LiPo battery packs, ESCs, power distribution boards (PDBs), RC cars, and general high-current DC hobby wiring. Two housing pieces make up a full connector pair -- a male half with two exposed bullet pins, and a female half with two recessed sockets. The housings are keyed with an asymmetric shape so the pair can only be mated one way, preventing the two pins from being swapped once both halves are assembled correctly.

Male vs Female: Understanding the Convention

A common point of confusion when wiring your first XT60 is which half goes where. The widely used hobby convention is:

Male XT60 (exposed bullet pins) on the battery pack.
Female XT60 (recessed socket housing) on the ESC, power distribution board, or other device that the battery plugs into.

This convention exists mostly for a practical reason: exposed pins on a device side, especially a PDB mounted in a frame, are more likely to get bumped or shorted against metal. Keeping the recessed socket on the device and the exposed pins on the removable battery reduces that risk somewhat.

That said, this is a convention, not a rule enforced by the connector's design or any standards body. Some manufacturers wire it the opposite way, and you will occasionally find batteries or boards that ship with the "wrong" gender relative to what you expect. Before connecting a new pack to a device for the first time, verify polarity with a multimeter rather than assuming connector gender tells you which pin is positive. Mating two connectors of the same gender is impossible by design, but mating a correctly-gendered connector wired with reversed polarity is entirely possible, and that is what causes damage.

Tools and Materials Needed

Soldering an XT60 is harder than soldering small-gauge wire because the pins are solid brass or copper alloy with a lot of thermal mass. A low-wattage iron struggles to get the pin hot enough before the solder cools into a weak joint. Gather the following first:

Soldering iron -- ideally 60-100W, or a temperature-controlled iron set to roughly 380-450F (195-230C), to heat the pin's thermal mass quickly.
Flush cutters -- for trimming wire ends cleanly.
Wire strippers -- sized for the wire gauge you are using.
Helping-hands tool or small vise -- to hold the connector steady while you solder with both hands.
Heat shrink tubing -- sized to fit over the connector's wire barrel, one piece per wire, cut before you start soldering.
Rosin-core solder -- 60/40 or similar, suited to electronics work.
Isopropyl alcohol or flux cleaner -- to remove flux residue.
Multimeter -- to verify polarity and check continuity before and after assembly.
Heat gun -- to shrink the heat shrink tubing once the joint has cooled.

Wire Gauge and Current Capacity Reference

The wire gauge you solder to an XT60 connector should be sized for the current the circuit will actually draw, not just for what physically fits in the pin cup. The table below is a commonly cited reference for silicone hobby wire ampacity -- an approximate guide used widely in the RC and drone community, not a formal electrical code standard. Actual safe current depends on the wire's insulation rating, the length of the run and resulting voltage drop, and ambient temperature.

Wire Gauge (AWG)	Approximate Continuous Current
22 AWG	~5-7A
20 AWG	~7-10A
18 AWG	~10-15A
16 AWG	~15-20A
14 AWG	~20-30A
12 AWG	~30-40A
10 AWG	~40-55A

Because an XT60 connector is rated around 60A, most battery packs and high-draw builds that actually approach that figure use 12-14 AWG silicone wire per lead as a practical working range. If your build only draws a modest current, a thinner gauge is fine electrically -- but the connector's pin cup is sized for a certain wire diameter range, and wire that is too thin can be mechanically weak inside the pin even when the current rating is not a concern.

Step-by-Step Soldering Procedure

Work through these steps in order. Do not skip the heat shrink step until later -- it needs to go on the wire before you solder both leads, not after.

Cut heat shrink to length first. Slide a piece of heat shrink tubing onto each wire before anything else, and push it back out of the way up the wire. This is the step most beginners forget, and forgetting it means desoldering a finished joint just to add the tubing.
Strip the wire. Strip roughly 4-6mm of insulation from the end of each wire, enough to fully fill the pin's solder cup without bare wire sticking out past it.
Twist and tin the wire end. Twist the strand ends tightly so no loose strands stick out, then apply a small amount of solder to the twisted end so it is pre-tinned and holds its shape.
Pre-tin the connector's pin cup. Heat the back of the pin (the solder cup, not the contact end that mates with the other connector half) and flow a small amount of solder into the cup so it is coated.
Heat the pin, not just the solder. Touch the iron to the outside of the pin's solder cup and hold it there until the pin itself is hot enough to melt solder on contact. Feeding solder onto a cold pin is how cold joints happen.
Insert the tinned wire into the molten solder. Once the pin is hot and the solder in the cup is liquid, push the pre-tinned wire end into the cup so the existing solder flows around it.
Hold still until solidified. Remove the iron and hold the wire perfectly still while the joint cools. Movement during cooling creates a fractured, weak joint even if it looked fine going in.
Inspect the joint. A good joint looks shiny with a smooth, concave fillet where solder meets pin. A cold joint looks dull, grey, and grainy, often rounded or lumpy rather than smooth. Reheat and redo any joint that looks cold.
Slide the heat shrink over the joint and shrink it. Move the tubing from step 1 down over the finished joint, covering the exposed pin barrel and a bit of the wire insulation, then apply heat with a heat gun until it shrinks snugly.
Repeat for the second wire, then check polarity. Solder the second lead the same way, then use a multimeter in continuity mode to confirm each wire lands on the correct pin before you consider the connector finished.

Common Soldering Mistakes

Most XT60 connector failures trace back to one of a handful of soldering mistakes:

Cold solder joints. A joint that looks dull, grainy, or grey instead of shiny and smooth usually was not heated enough. Cold joints have poor mechanical strength and higher electrical resistance, which shows up later as heat and intermittent connection.
Forgetting heat shrink until after both wires are soldered. Once both leads are on, you cannot slide heat shrink over the pin barrel without desoldering. Place the tubing on the wire before you solder.
Overheating and melting the plastic housing. XT60 housings are plastic and will deform if the iron contacts them directly or you hold heat on the pin too long. Let the pin's own thermal mass do the work rather than blasting it with heat.
Insufficient tinning. If the wire or pin cup is not properly pre-tinned, the joint may look filled but have poor solder penetration underneath, creating a weak bond that pulls apart under tension or vibration.
Wrong polarity. Housings are keyed so the two halves only mate one way, but that keying does not protect against soldering a wire to the wrong pin inside a single housing. Check which pin is positive and which is negative before you solder, not after.
Excess flux left uncleaned. A little rosin flux is normal, but heavy residue left uncleaned with isopropyl alcohol can leave a film that is mildly conductive or corrosive over time, especially in a humid environment.

Series vs Parallel Battery Wiring

Once your connectors are soldered, how you wire multiple packs together changes what you get out of the combination.

Series wiring connects the positive terminal of one pack to the negative terminal of the next. In series, voltage adds together while capacity (mAh) stays the same as a single pack. Connecting two 3S packs (11.1V nominal each) in series produces a 6S pack at 22.2V nominal, with the same mAh rating as one of the individual packs. Series connections are typically made with a purpose-built series adapter lead rather than by soldering packs directly together, since you usually want the option to separate them again.

Parallel wiring connects positive to positive and negative to negative across packs. In parallel, capacity adds together (two 5000mAh packs behave like one 10000mAh pack) while voltage stays the same as a single pack. Packs connected in parallel must be the same voltage and cell count, and ideally close to the same state of charge before you connect them. Connecting packs at meaningfully different charge levels causes a sudden current surge between packs as the higher-voltage one equalizes with the lower one, which can generate significant heat at the connectors and stress both packs.

Parallel charging boards, which let you charge several same-voltage packs at once through individual balance leads while treating them as one parallel capacity, are a common accessory built around this relationship. Series and parallel adapter leads (sometimes sold as "SP" leads or harnesses) are the standard way to combine packs without permanently modifying them.

LiPo Safety When Wiring XT60 Connectors

LiPo batteries carry real fire risk if handled carelessly, and soldering work is one of the higher-risk moments in the pack's life cycle. Follow these practices:

Never solder directly onto a battery that is connected or fully charged. Disconnect the pack from any load, and if replacing a connector on an existing pack, work with it at a storage charge level rather than fully charged when practical.
Use a fireproof container or "battery bag" when charging or storing LiPo packs, including packs sitting nearby while you solder on an unrelated connector.
Never short the two pins together. A momentary short across an XT60's pins, especially right after soldering when the joint is still exposed and the two leads are close together, can produce a large current spike and a shower of sparks.
Double check polarity even though the housing is keyed. Not every XT60 housing enforces the same keying precision, and cheaper or worn connectors can sometimes be forced together in ways not intended by the design. Verify polarity with a multimeter rather than trusting the connector shape alone.
Watch for shorts before heat shrink goes on. The window between finishing a joint and getting heat shrink over it is when the two exposed pin barrels are most likely to touch each other or a metal surface. A dead short across a freshly soldered connector still attached to a battery is a genuine fire risk. Keep the two leads separated until both are insulated.

Troubleshooting Table

Symptom	Likely Cause	Fix
Connector runs hot during use	Undersized wire gauge for the current draw, or a cold/weak solder joint adding resistance	Confirm wire gauge matches the draw, then inspect and reflow the joint if it looks dull or grainy
Connector will not seat or feels loose	Worn or slightly out-of-spec housing, or a mismatched connector from a different manufacturer	Replace the worn half, or try a connector from the same manufacturer as its mating half
Intermittent power cutout	Cold solder joint with a fractured connection, or a wire not fully seated in the pin cup	Reheat and redo the joint, making sure the wire is fully inserted before the solder solidifies
Burnt smell after use	Overheated connector from excess resistance, often a cold joint, undersized wire, or a partial short	Stop use immediately, inspect the connector and wiring for damage, and resolder or replace before reuse
Wire pulls out of pin under light tension	Insufficient tinning or wire not seated deep enough in the cup before the joint cooled	Strip and re-tin the wire, reinsert fully into the cup while molten, and let it cool undisturbed
Wrong polarity connected, device damage	Wire soldered to the incorrect pin, or a battery/device with reversed convention not checked first	Verify polarity with a multimeter before every new pack-to-device connection, regardless of gender

Common Installation Mistakes

Beyond soldering technique, a handful of broader mistakes account for most XT60 problems:

Mismatched male/female genders creating a short risk. If you end up with two male or two female connectors on a circuit that needs to mate, improvising an adapter with exposed wire can create a short. Use a proper adapter lead instead.
Mixing battery brands with slightly different pin spacing tolerances. XT60 connectors from different manufacturers are generally compatible, but small tolerance differences occasionally cause a stiff or loose fit. Test the fit before relying on it.
Skipping heat shrink entirely. Bare solder joints on a connector barrel are exposed to accidental shorts and physical damage. Always insulate the joint.
Using undersized wire for the connector's rated current. An XT60 rated around 60A does not mean your wiring needs to support 60A if your actual draw is lower, but wire undersized for your real draw will overheat well before the connector becomes the limiting factor.

Key Takeaways

An XT60 is a two-pin bullet connector rated around 60A continuous, sitting between the smaller XT30 (~30A) and larger XT90 (~90A) in the same connector family.
The widely used convention is male (pins) on the battery, female (socket) on the ESC or device -- but this is convention, not a rule, so always verify polarity before connecting a new pack.
Use a 60-100W iron or a temperature-controlled iron around 380-450F (195-230C) to heat the pin's thermal mass quickly, and use 12-14 AWG silicone wire for packs that approach the connector's rated current.
Slide heat shrink onto the wire before you solder, not after -- this is the most common beginner mistake.
A good solder joint is shiny and smooth; a dull, grainy joint is cold and needs to be redone.
In series, voltage adds and capacity stays the same; in parallel, capacity adds and voltage stays the same, and packs must match voltage and charge level before paralleling.
Never solder on a connected or fully charged battery, keep LiPo packs in a fireproof bag when charging or storing, and keep the two leads separated until heat shrink is applied to avoid a dead short.
Always confirm polarity with a multimeter before mating a new connector pair, regardless of what the housing gender suggests.

Esc Wiring Diagram — open the interactive version of this diagram to customise and export it.

Battery Wiring Diagram — open the interactive version of this diagram to customise and export it.

Parallel Battery Diagram — open the interactive version of this diagram to customise and export it.

Drone Circuit Diagram — open the interactive version of this diagram to customise and export it.

Dual Battery Wiring Diagram — open the interactive version of this diagram to customise and export it.

Soldering Iron Wiring Diagram — open the interactive version of this diagram to customise and export it.

Frequently asked questions

What amperage is an XT60 connector rated for?

An XT60 connector is rated for around 60A continuous current. It sits in the middle of a connector family that also includes the smaller XT30 (roughly 30A) and the larger XT90 (roughly 90A), so the right size depends on how much current your battery pack or device actually draws.

Should the battery have the male or female XT60 connector?

The widely used hobby convention puts the male connector (exposed bullet pins) on the battery pack and the female connector (recessed socket) on the ESC or power distribution board. This is a convention, not a strict rule, so always verify polarity with a multimeter before connecting a new pack to a device.

What size soldering iron do I need for an XT60 connector?

Use a 60-100W soldering iron, or a temperature-controlled iron set to roughly 380-450F (195-230C). XT60 pins have a lot of thermal mass, and a low-wattage iron will struggle to heat the pin fully before the solder cools into a weak, cold joint.

What gauge wire should I use with an XT60 connector?

For packs approaching the connector's rated current, 12-14 AWG silicone wire is the common working range. Lighter loads can use thinner wire, but actual safe current also depends on insulation, wire length, and ambient temperature, so treat gauge tables as an approximate reference.

Can I connect two LiPo batteries in parallel with an XT60 harness?

Yes, using a parallel adapter lead, but only if the packs are the same voltage and cell count and are close to the same state of charge. Connecting packs at very different charge levels in parallel can cause a sudden current surge between them and generate significant heat at the connectors.

How do I know if my XT60 solder joint is bad?

A good joint looks shiny and smooth with a concave fillet where the solder meets the pin. A cold or bad joint looks dull, grainy, and grey, sometimes with a lumpy shape. Reheat and redo any joint that does not look shiny before you add heat shrink.