# FPV Drone Battery Connectors Compared: XT30 vs XT60 vs XT90, Soldering, and Selection Guide
Your drone’s battery connector is one of the most overlooked yet critical components in the power system. A poor connector choice — or worse, a badly soldered one — can cause voltage sag, hot plugs, mid-flight disconnects, and even fires. This guide compares every common FPV connector, explains how to select the right one for your build, and covers proper soldering technique for reliable high-current connections.
## Connector Types and Their Specifications
| Connector | Max Continuous Current | Burst Current | Wire Gauge | Typical Build Type | Weight (Pair) |
|—|—|—|—|—|—|
| XT30 (Yellow) | 30A | 45A | 14-16 AWG | 2.5-3 inch micros, toothpicks | 2.9g |
| XT30U (Blue) | 30A | 45A | 14-16 AWG | Same as XT30, updated housing | 3.0g |
| XT60 (Yellow) | 60A | 100A | 12-14 AWG | 3-5 inch freestyle, racing | 7.5g |
| XT60H (Yellow, half) | 60A | 100A | 12-14 AWG | Slim builds, tight frames | 6.0g |
| XT90 (Green) | 90A | 150A | 10-12 AWG | 5-7 inch, X-Class, heavy lift | 16g |
| XT90-S (Green, Anti-Spark) | 90A | 150A | 10-12 AWG | Same as XT90 with built-in spark protection | 18g |
| MR30 (3-pin) | 15A per pin | 20A | 16-18 AWG | Motor quick-connect (one per motor) | 2.0g |
| Deans (T-Plug) | 50A | 80A | 12-14 AWG | Legacy builds (not recommended for new) | 4.5g |
## Which Connector Should You Choose?
### XT30 — Best for Micro and Toothpick (2-3.5 inch)
If your build draws under 25A continuous per motor (4S, 1404-1505 motors), XT30 is the perfect lightweight choice. The compact size saves valuable frame space. **Note:** Do NOT use XT30 on 5-inch builds — even a mild 5-inch freestyle quad can pull 80A+ bursts that exceed XT30 ratings.
### XT60 — The Gold Standard for 5-Inch
The XT60 is by far the most common connector in FPV across 4S and 6S 5-inch builds. It handles 60A continuous and 100A+ bursts with low resistance. If you are building any standard 5-inch freestyle or racing quad, start here. It is reliable, widely available, and nearly impossible to connect backward thanks to the polarized housing.
### XT90 — For High-Power 6S+ and X-Class
When your build pulls serious current (7-inch long-range on 6S, X-Class, or heavy-lift rigs), step up to the XT90. The XT90-S variant with built-in **anti-spark** is strongly recommended — it uses a 5.6-ohm resistor in the connector tip that pre-charges the ESC capacitors before the main contacts connect, eliminating the loud spark and preventing connector pitting.
### Deans (T-Plug) — Legacy, Avoid for New Builds
Deans connectors were standard in the 2014-2018 era. They work, but they are harder to solder, harder to grip, and have higher resistance than equivalent XT connectors. Unless you have a fleet of legacy quads and batteries, migrate to XT60 or XT30.
## How to Solder Battery Connectors Properly
A badly soldered connector is a fire hazard. Follow this process carefully:
### Step 1: Prepare the Connector
– **Plug the mating connector in.** This acts as a heatsink and keeps the pins aligned if the plastic softens from heat.
– Tin the solder cups/pins by filling them about 2/3 with solder.
– Let them cool before proceeding — hot plastic deforms.
### Step 2: Prepare the Wire
– Strip 3-4mm of insulation (not more — exposed wire beyond the cup is a short risk).
– Tin the exposed wire thoroughly. The solder should wick all the way through the wire strands.
– For XT90 with 10 AWG wire, pre-tinning is essential — thick wire needs more heat.
### Step 3: Soldering
– Use a **high-wattage iron** (60W minimum, 80W+ recommended for XT60/XT90).
– Set temperature to **380-400°C** (716-752°F) for lead-free solder, **350-370°C** for leaded.
– Hold the tinned wire against the pre-filled cup.
– Touch the iron to the **cup body** (not the wire directly) until both solder pools flow together.
– Hold the wire perfectly still for 3-5 seconds while the joint solidifies.
– The finished joint should be **shiny and smooth** — dull or grainy means a cold joint.
### Step 4: Heat Shrink
– Slide heat shrink over the wire BEFORE soldering (easy to forget!).
– Use **adhesive-lined heat shrink** for extra mechanical strain relief.
– Heat shrink should cover the full solder cup and extend 5-8mm onto the wire insulation.
## Connector Maintenance and Warning Signs
| Symptom | Problem | Action |
|—|—|—|
| Connector too hot to touch after flight | Resistance too high, undersized connector | Upgrade to next size up, check solder joints |
| Black/pitted contact surfaces | Arcing damage from sparking | Replace connector, consider anti-spark XT90-S |
| Loose fit (slides apart too easily) | Worn spring contacts | Replace connector — do not crimp pins |
| Melted or deformed housing | Overheating during soldering or flight | Replace connector, use heatsink during soldering |
| Green/white corrosion on pins | Moisture exposure | Clean with contact cleaner, apply dielectric grease |
## Recommended Products
Quality connectors matter — counterfeit XT60/XT90 connectors use inferior brass contacts that corrode and develop high resistance. UAVModel carries genuine **AMASS XT30, XT60, and XT90 connector pairs** along with adhesive-lined heat shrink and high-quality silicone wire for reliable power connections. Visit [uavmodel.com](https://uavmodel.com) for authentic power connectors that keep your build safe.