# 4S vs 6S LiPo Batteries for FPV Drones: The Complete Comparison
When building or upgrading an FPV drone, one of the most critical decisions you will make is choosing between a 4S and 6S LiPo battery system. The power delivery, flight characteristics, and overall performance of your quadcopter hinge on this fundamental choice.
In this comprehensive guide, we’ll break down the technical differences between 4S (14.8V) and 6S (22.2V) setups, explore how they affect your motors and ESCs, and help you decide which voltage is right for your flying style.
## The Core Difference: Voltage and Cell Count
The “S” in LiPo batteries stands for “Series.” A 4S battery has four individual cells wired in series, while a 6S battery has six. Since each standard LiPo cell has a nominal voltage of 3.7V:
* **4S LiPo:** 4 x 3.7V = 14.8V nominal (16.8V fully charged)
* **6S LiPo:** 6 x 3.7V = 22.2V nominal (25.2V fully charged)
This voltage difference fundamentally changes how power is delivered to the motors. According to Watt’s Law (P = V x I), to achieve the same power output (P), a higher voltage (V) requires less current (I).
## 4S vs 6S Specification Comparison
Here is a quick technical comparison of how 4S and 6S setups generally stack up on a standard 5-inch freestyle or racing quadcopter.
| Feature | 4S Setup (14.8V) | 6S Setup (22.2V) |
| :— | :— | :— |
| **Typical Motor KV (5-inch)** | 2300KV – 2700KV | 1700KV – 1900KV |
| **Amp Draw (Current)** | Higher (Requires higher amp ESCs) | Lower (Runs cooler, less battery sag) |
| **Voltage Sag** | Pronounced towards end of flight | Minimal until completely depleted |
| **Throttle Resolution** | Good, but tapers off at low voltage | Excellent and consistent throughout flight |
| **Battery Weight** | Generally lighter (e.g., 1500mAh 4S) | Slightly heavier (e.g., 1050mAh 6S) |
| **Component Stress** | High stress on battery connectors (XT60) | High stress on ESC voltage regulators |
## Why the FPV Community Moved to 6S
For years, 4S was the undisputed standard for 5-inch miniquads. However, as FPV pilots pushed the limits of speed and agility, 4S setups started showing their weaknesses—primarily **voltage sag**.
When you punch the throttle on a 4S quad, the motors demand a massive amount of current. This high current draw causes the battery voltage to drop temporarily (sag). As the battery depletes over the flight, this sag becomes worse, making the quad feel “mushy” and less responsive in the last minute of flight.
### The 6S Advantage: Efficiency and Consistency
By switching to 6S, you increase the voltage by 50%. To maintain the same RPM at the propeller, you use lower KV motors (typically around 1700-1900KV instead of 2300-2700KV).
Because the voltage is higher, the system draws significantly less current to produce the same thrust. This lower current draw results in:
1. **Significantly less voltage sag:** The battery maintains its voltage much better under heavy load.
2. **Consistent power:** The quadcopter feels just as punchy and locked-in at the end of the flight as it does at the beginning.
3. **Cooler electronics:** Less current means less heat generated by the ESCs, battery wires, and connectors.
4. **Longer battery life:** Less heat waste means better overall efficiency.
If you are looking to upgrade your setup, check out the premium high-discharge LiPo batteries available at [uavmodel.com](https://www.uavmodel.com). Our 6S 1200mAh 130C packs are specifically engineered to minimize voltage sag and deliver raw, consistent power for the most demanding FPV freestyle and racing pilots.
## Is 4S Obsolete?
Absolutely not. 4S setups are still incredibly popular, and for good reasons:
* **Cost:** 4S batteries are generally cheaper than 6S batteries.
* **Weight:** A typical 4S battery (like a 1500mAh) can be slightly lighter than an equivalent 6S setup, which is ideal for ultralight builds.
* **Beginner Friendly:** The power delivery of a 4S system is often more manageable for newer pilots, and replacing damaged 4S batteries is less painful on the wallet.
If you are just starting out in FPV, a 4S setup is still a fantastic entry point.
## Making the Switch: What You Need to Know
If you are planning to convert an existing 4S drone to 6S, you cannot simply plug in a 6S battery. You must ensure your components are compatible:
1. **Motors:** You **must** change your motors to a lower KV (e.g., 1700KV – 1900KV). Running 6S on high KV 4S motors will cause them to over-spin, likely burning out your motors, ESC, or both.
2. **ESC (Electronic Speed Controller):** Check the voltage rating on your ESC. It must be explicitly rated for 6S.
3. **Flight Controller / VTX:** Ensure your flight controller’s internal BEC (Battery Eliminator Circuit) can handle up to 25.2V input.
4. **Capacitors:** Always run a high-quality Low-ESR capacitor (e.g., 1000uF 35V) on the main battery pads when flying 6S to absorb voltage spikes that can fry electronics.
## See It In Action
Want to see the difference between 4S and 6S in the real world? Check out this excellent technical breakdown and flight comparison:
## Final Verdict
If you are building a new 5-inch freestyle or racing quadcopter from scratch, **go 6S**. The consistent power delivery, lack of voltage sag, and cooler running components make it the undisputed choice for modern FPV.
However, if you are on a tight budget, flying smaller drones (3-inch or 4-inch), or just getting your feet wet in the hobby, 4S remains a viable, cost-effective option. Just remember to use high-quality cells, like the trusted packs found at [uavmodel.com](https://www.uavmodel.com), to get the best performance regardless of your voltage.