Quick Answer
4S LiPos (14.8V) are lighter and cheaper, making them ideal for freestyle, whoops, and beginner builds. 6S LiPos (22.2V) deliver more power and punch, suited to racing, aggressive freestyle, and 7-inch long-range quads. The right choice depends on your frame size, flying style, and how much voltage sag you can tolerate.
What Do 4S and 6S Mean?
The "S" number refers to how many cells are wired in series inside the battery pack. Each lithium polymer cell has a nominal voltage of 3.7V. A 4S pack sits at 14.8V nominal (16.8V fully charged), while a 6S pack sits at 22.2V nominal (25.2V fully charged). That higher voltage means a 6S system pushes more power through your motors at any given throttle position.
Power and Performance
The main advantage of 6S is raw power. Because the voltage is higher, you can achieve the same motor RPM with a lower KV motor. Lower KV motors are generally more efficient and run cooler. A 6S 1300mAh battery on a 5-inch quad with 1300KV motors will feel snappier and hold its voltage better under load than a 4S 1500mAh pack with 2300KV motors.
That said, 4S setups are perfectly capable for most flying styles. Modern 4S freestyle builds with quality motors like the EMAX Eco III 2207 deliver plenty of power for everyday flying, and the lighter pack keeps your quad agile.
Weight Comparison
| Battery | Typical Capacity | Typical Weight | Best For |
|---|---|---|---|
| 4S 1300mAh | 1300-1500mAh | 140-170g | 5-inch freestyle, general flying |
| 4S 850mAh | 650-850mAh | 80-100g | 3-4 inch, cinewhoops |
| 6S 1300mAh | 1100-1400mAh | 170-210g | 5-inch racing, aggressive freestyle |
| 6S 2200mAh+ | 2200-3000mAh | 300-400g | 7-inch long range |
A 6S pack typically weighs 20-40g more than an equivalent-capacity 4S pack. That extra weight is noticeable on smaller frames. For builds under 250g, 4S is usually the better choice.
Which Frame Sizes Suit Each Voltage?
4S Builds
Most 3-inch, 4-inch, and many 5-inch freestyle quads run 4S. It is the sweet spot for weight-sensitive builds. The CNHL Black Series 4S 1500mAh is a popular option that balances capacity and weight for 5-inch frames.
6S Builds
Racing quads and 7-inch long-range builds favour 6S. The extra voltage means less current draw at high throttle, which reduces heat in your ESCs and extends flight times on larger props. The CNHL Ministar 6S 1300mAh works well for both racing and freestyle at a reasonable weight.
Cost Considerations
4S batteries, chargers, and accessories tend to be cheaper than their 6S equivalents. A basic 4S charger like the SkyRC B6neo handles 4S packs easily. For 6S, you need a charger that supports the higher cell count, and 6S batteries themselves typically cost more per pack. Spare parts like XT60 leads and balance connectors are universal, but the batteries themselves are not interchangeable between voltages.
Voltage Sag and C Rating
Higher C ratings mean the battery can deliver more current without voltage sag. When comparing 4S and 6S, keep in mind that a 6S system draws less current for the same power output (watts = volts x amps), so voltage sag under load is often better on 6S even with a lower C-rated pack. For a deeper explanation of how C ratings affect performance, read our guide on FPV battery problems and voltage sag.
4S vs 6S Summary
| Factor | 4S | 6S |
|---|---|---|
| Weight | Lighter | Heavier (20-40g more) |
| Power | Good for smaller freestyle and whoops | Best for racing and long range |
| Cost | Lower (batteries, chargers) | Higher |
| Motor KV | Higher KV needed (1900-2800) | Lower KV needed (1100-1700) |
| Voltage sag | More noticeable under load | Less sag at equivalent power |
| Best frame size | 3-4 inch | 5-7 inch |
If you are still deciding on your first battery, our FPV battery buying guide covers the basics of capacity, C ratings, and connectors. Browse the full range in the batteries collection and chargers collection to find the right gear for your build.