4S Lipo Battery: 14.8V Specs, Charging, Applications & OEM Guide
Published by A&S Power | Battery Technology
Introduction
If you’re into RC cars, drones, or high-performance electronics, you’ve probably heard about the 4S lipo battery. But what exactly does “4S” mean, and why would you choose it over a 3S or 6S? This guide breaks down everything you need to know — from voltage specs and charging procedures to real-world applications and safety considerations.
At A&S Power, we manufacture custom lithium polymer batteries for OEM buyers worldwide. Our 4S LiPo packs are used in RC vehicles, drones, industrial equipment, and portable power systems. This guide covers everything from voltage and capacity to common uses and charging tips.
For a complete voltage reference covering all LiPo configurations, see our LiPo Battery Voltage Chart & C-Rating Guide. If you’re new to lipo batteries, start with our Lipo Battery 101 guide.
What is a 4S Lipo Battery?
A 4S lipo battery is a lithium polymer battery pack that contains four cells connected in series. The “S” stands for “series,” meaning the cells are stacked together to increase voltage. Each LiPo cell has a nominal voltage of 3.7V, so four cells in series produce 14.8V nominal — the defining characteristic of a 4S pack.
Understanding the “S” notation is critical: 1S = 3.7V, 2S = 7.4V, 3S = 11.1V, 4S = 14.8V, 6S = 22.2V. The number before S always tells you how many cells are wired in series, and multiplying by 3.7V gives you the nominal voltage.
4S packs are among the most popular configurations in the RC and drone world because they strike a balance between power output and manageable voltage. They deliver enough voltage for high-performance applications without the extreme current demands and safety considerations of 6S or higher configurations.
Key Specifications
| Specification | Value |
|---|---|
| Number of cells | 4 cells (4S) |
| Nominal voltage | 14.8V (4 × 3.7V) |
| Full charge voltage | 16.8V (4 × 4.2V) |
| Storage voltage | 15.2V (4 × 3.8V) |
| Cutoff voltage | 12.0V (4 × 3.0V) |
| Minimum safe under load | 12.8V (3.2V per cell) |
| Common capacities | 1,000mAh – 6,000mAh |
| Configurations | 4S1P, 4S2P, 4S3P |
| Typical C-rating | 25C – 100C+ |
| Energy range (typical) | 14.8Wh – 88.8Wh |
The difference between 4S1P and 4S2P matters: 4S1P means four cells in series (voltage ×4, capacity stays the same), while 4S2P means four cells in series with two parallel groups (voltage ×4, capacity doubled). A 4S2P 3000mAh pack is essentially two 4S1P 1500mAh packs wired in parallel.
Common Uses of 4S Lipo Batteries
4S lipo batteries are widely used in applications requiring higher power and speed. The 14.8V nominal voltage provides a significant performance boost over 3S (11.1V) while remaining easier to manage than 6S (22.2V) systems.
| Application | Why 4S Lipo Battery | Typical Capacity |
|---|---|---|
| RC cars and trucks | Higher speed and torque than 3S; 1/8 scale buggies and monster trucks commonly use 4S | 4,000–6,000mAh |
| Racing drones and FPV | More power for acceleration; 5-inch freestyle and racing quads favor 4S | 1,300–1,800mAh |
| Large drones | Extended flight time; agricultural and survey drones use 4S or 6S | 5,000–10,000mAh |
| Airsoft guns | High discharge for rapid firing; excellent rate of fire | 1,000–2,500mAh |
| Boats and marine RC | Good speed for mono and catamaran hulls | 3,000–5,000mAh |
| Portable power stations | 14.8V is a common bus voltage for compact power banks | 5,000–20,000mAh |
| Industrial equipment | Test instruments, portable scanners, field devices | 2,000–5,000mAh |
4S provides noticeable power over 3S but is easier to manage than 6S batteries. For OEM product designers, 4S is often the sweet spot when your device needs more than 11.1V but doesn’t require the full 22.2V of a 6S system.
4S Lipo Battery vs 3S vs 6S – What’s the Difference?
Choosing the right cell count is one of the most important decisions in battery pack design. Here’s how 4S compares to the two most common alternatives:
| Feature | 3S Lipo (11.1V) | 4S Lipo (14.8V) | 6S Lipo (22.2V) |
|---|---|---|---|
| Nominal voltage | 11.1V | 14.8V | 22.2V |
| Full charge | 12.6V | 16.8V | 25.2V |
| Cutoff voltage | 9.0V | 12.0V | 18.0V |
| Speed/Power | Moderate | Higher | Very high |
| Current draw (same power) | Higher (~45A at 500W) | Medium (~34A at 500W) | Lower (~23A at 500W) |
| Weight | Medium | Heavier | Very heavy |
| ESC/charger cost | Lower | Medium | Higher |
| Best for | Mid-sized RC, beginners | Racing, larger RC, FPV | Pro racing, large drones |
A key engineering principle: higher voltage means lower current for the same power output. Power (watts) = voltage × current. A 4S system delivering 500W draws ~33.8A, while a 3S system delivering the same 500W draws ~45A. Lower current means less heat, smaller wires, and more efficient power delivery.
For more on different cell counts, see our 3S Lipo Battery and 6S Lipo Battery guides.
How to Choose the Right 4S Lipo Battery
Selecting the right 4S pack involves matching five key parameters to your application:
1. Capacity (mAh)
Higher capacity = longer runtime, but also more weight. For racing drones, 1,300–1,500mAh is common. For RC cars, 4,000–6,000mAh is typical. Calculate required capacity using: Capacity (mAh) = (Average current draw in mA × Runtime in hours) / DOD factor. A 0.8 DOD factor is conservative and extends cycle life.
2. Discharge Rate (C-rating)
The C-rating tells you how much current the battery can safely deliver: Max current = Capacity (Ah) × C-rating. A 1500mAh 75C pack can deliver 112.5A continuously. For racing drones, 70C–100C is common. For RC cars, 30C–50C is sufficient. Always verify with actual load testing — advertised C-ratings vary between manufacturers.
3. Connector Type
Most 4S packs use XT60 (up to ~60A) or XT90 (up to ~90A). Other options include Deans/T-plug, EC5, and TRX for Traxxas. Check your device compatibility before purchasing.
4. Physical Dimensions and Weight
Ensure the battery fits your compartment. A 4S1P 1500mAh pack might measure 35×35×75mm and weigh ~160g, while a 4S2P 5000mAh pack could be 45×140×35mm and weigh ~500g. Always verify dimensions against your device’s battery bay.
5. Internal Resistance and Cell Quality
Lower internal resistance means less voltage sag under load. Quality 4S packs should have per-cell IR below 10–15mΩ. A&S Power uses premium grade-A cells with consistent IR matching across all four cells, ensuring balanced discharge and long cycle life.
How to Charge a 4S Lipo Battery Safely
Charging a 4S LiPo correctly is essential for safety and battery longevity. A 4S pack requires a balance charger that supports at least 4 cells.
What You Need
- Lipo balance charger (supports 4S / 14.8V)
- 4S balance lead (5-pin JST-XH connector)
- Fire-safe charging bag or ceramic container
- Appropriate main power connector (XT60, XT90, etc.)
Step-by-Step Charging Procedure
- Inspect the battery — Check for swelling, damage, or abnormal temperature. Do not charge a damaged or puffy pack.
- Connect the balance lead — Plug the 5-pin JST-XH into the charger’s 4S balance port. This is critical for monitoring each cell.
- Connect the main power leads — Plug the XT60/XT90 main connector into the charger.
- Set charger to 4S (14.8V) — Do not select 3S or 6S. Most chargers auto-detect, but always verify.
- Set charging current to 1C — e.g., 1.5A for 1,500mAh, 5.0A for 5,000mAh.
- Start charging and monitor — Never leave a charging LiPo unattended.
- Wait for completion — Charger shows “Complete” when all cells reach 4.20V.
- Disconnect — Unplug main lead first, then balance lead. Store at storage voltage if not using immediately.
⚠️ Never charge a 4S lipo without balance charging. Uneven cell charging creates fire hazards. Without balancing, a cell can be overcharged to 4.3V+, causing thermal runaway.
4S Lipo Battery Voltage Chart
Understanding voltage levels at different states of charge helps you monitor battery health and avoid over-discharge:
| State of Charge | Per Cell | 4S Total | Action |
|---|---|---|---|
| 100% (Full) | 4.20V | 16.80V | Ready to use; don’t store long-term |
| 75% | 3.95V | 15.80V | Good operating range |
| 50% (Storage) | 3.80V | 15.20V | Ideal for long-term storage |
| 25% | 3.65V | 14.60V | Consider recharging soon |
| Low warning | 3.40V | 13.60V | Land/stop using immediately |
| Critical (cutoff) | 3.00V | 12.00V | Do not discharge below this |
| Damaged | Below 3.00V | Below 12.00V | Permanently damaged; dispose safely |
Voltage under load reads lower than at rest. A 4S pack at 14.0V rest may sag to 13.0V under heavy acceleration. Set your ESC cutoff to 12.8–13.6V (3.2–3.4V/cell) to account for sag.
Storage and Maintenance Best Practices
Proper storage and maintenance significantly extend the life of your 4S LiPo batteries:
- Store at storage voltage (3.8V/cell = 15.2V total) — Never store fully charged (16.8V) for more than 3 days.
- Store in a cool, dry place — Ideal temperature is 15–25°C (59–77°F). Avoid above 35°C or below 0°C.
- Use a fire-safe storage bag — LiPo-safe bags or metal containers contain fires if a battery fails.
- Check voltage monthly — Verify stays above 3.6V/cell (14.4V total). Recharge to storage voltage if it drops.
- Cycle every 3 months — For long-term storage, do a partial charge/discharge cycle every 90 days.
- Never discharge below 3.0V/cell — Over-discharge causes irreversible lithium plating.
- Inspect before each use — Look for swelling, punctures, damaged wires, or connector corrosion.
Safety Considerations
4S LiPo batteries store significant energy (up to 88+ Wh in larger packs) and require careful handling:
- Always use a balance charger — Never charge with a non-balancing charger.
- Never leave charging unattended — Most LiPo fires occur during charging.
- Set correct cell count — Charging a 4S pack as 3S overcharges cells to 5.6V — catastrophic.
- Avoid physical damage — Punctures or crushing can cause internal short circuits.
- Don’t charge damaged or puffy batteries — Swollen cells are at higher risk of thermal runaway.
- Keep away from flammable materials — Charge on a non-flammable surface.
- Follow shipping regulations — Packs over 100Wh require special handling for air transport.
For comprehensive safety information, read our Lithium Battery Safety & Compliance Guide.
Frequently Asked Questions
1. Can I use a 4S lipo battery in a 3S device?
No. 4S batteries deliver 14.8V vs 11.1V and will damage 3S-compatible devices, including burning out ESCs, motors, and flight controllers.
2. What is the voltage of a fully charged 4S lipo battery?
A fully charged 4S lipo reads 16.8V (4.2V per cell × 4). This is the maximum safe voltage.
3. What is the lowest voltage for a 4S lipo battery?
The minimum safe voltage is 12.0V (3.0V per cell). Set your device cutoff to 12.8–13.6V to account for voltage sag under load.
4. How long does a 4S lipo battery last?
Under normal use and proper care, a 4S lipo lasts 300–500 charge cycles (approximately 2–5 years). Cycle life depends on depth of discharge, charge rate, and storage practices.
5. Can I charge a 4S battery on a 3S charger?
No. A 3S charger only supplies up to 12.6V and cannot fully charge a 4S pack (requires 16.8V). Always use a charger rated for at least 4S.
6. What does 4S1P mean?
4S1P means 4 cells in Series, 1 in Parallel — four cells wired end-to-end for 14.8V with single-cell capacity. 4S2P doubles the capacity at the same 14.8V.
7. How do I know if my 4S battery is balanced?
Check each cell with a LiPo checker or multimeter. A healthy pack has all four cells within 0.05V of each other. Persistent imbalance may indicate a failing cell.
8. Is 4S better than 3S for drones?
For 5-inch FPV freestyle and racing, 4S provides more power and top speed. For 3-inch and smaller drones or cinematic flying, 3S is lighter and more efficient. Match to your ESC and motor KV.
9. How should I dispose of a damaged 4S LiPo?
Discharge to 0V using a LiPo discharger or small load, then take to a battery recycling center. Never throw LiPo batteries in the trash. See our disposal guide.
10. Can I use a partially charged 4S battery?
Yes, LiPos work at any state of charge, but performance decreases as voltage drops. Above 14.0V (3.5V/cell) provides reasonable performance; below that expect noticeably reduced power.
Custom 4S Lipo Battery Solutions from A&S Power
We manufacture custom 4S lithium polymer batteries for OEM buyers across RC, drones, medical, industrial, and portable power industries. Every pack is built with grade-A cells and full safety certifications.
- Custom dimensions and capacities (1,000mAh–20,000mAh+)
- 4S1P / 4S2P / 4S3P / 4S4P configurations
- Integrated PCM/BMS with over-charge, over-discharge, over-current & short-circuit protection
- Custom connectors (XT60, XT90, Deans, JST, custom harnesses)
- NTC thermistor for temperature monitoring; SMBus/I2C for smart batteries
- UL 1642, IEC 62133, CE, RoHS, REACH, UN38.3 certified