4S LiPo Battery Guide: 14.8V, 16.8V Full Charge, and High-Performance RC Uses

A 4S LiPo battery contains four lithium-polymer cells connected in series. A standard 4S LiPo is rated at 14.8V nominal and reaches approximately 16.8V when fully charged. It is one of the most versatile higher-performance battery formats in RC, with common applications in FPV drones, airplanes, RC cars, boats and helicopters.

Compared with 3S, a 4S battery gives the power system more voltage to work with. In a properly matched setup, that can translate into stronger acceleration, higher motor RPM potential or more power without relying entirely on higher current. But 4S is not automatically an upgrade. The ESC, motor, gearing, propeller, fan, drivetrain and other electronics must all be designed for the voltage.

4S LiPo Battery Quick Reference

What Does “4S” Mean on a LiPo Battery?

The S stands for series. A 4S LiPo therefore contains four cell groups connected in series.

Standard LiPo cells are commonly rated at approximately 3.7V nominal:

When fully charged, a standard LiPo cell reaches approximately 4.20V:

This is why 4S LiPo and 14.8V LiPo battery normally describe the same standard voltage class.

To see how 4S fits into the full voltage ladder, read the LiPo Battery Voltage Guide: 1S to 8S Explained for RC Models.

4S LiPo Voltage Explained

Actual voltage while the model is operating will move continuously and can sag under heavy load. The amount of sag depends on current draw, battery condition, internal resistance, temperature and the overall power system.

What Is a 4S LiPo Battery Used For?

4S is one of the broadest high-performance LiPo voltage classes in the RC hobby. It sits above the familiar 3S level but below the heavier and more demanding 6S class, which makes it a practical middle ground for many models.

FPV drones

4S has long been an important voltage platform for FPV, especially 5-inch freestyle and racing quads designed around 4S motors and electronics.

Compared with a comparable 6S setup, a 4S battery can often be lighter and may give the quad a direct, energetic throttle character. Whether 4S or 6S feels better depends on motor KV, propeller choice, battery weight and the way the pilot wants the quad to respond.

Smaller 4S FPV batteries may sit around 650–1800mAh, while larger capacities are used on long-range or specialized platforms.

RC airplanes

4S is also very common in fixed-wing aircraft where 3S no longer provides enough power but 6S would add unnecessary battery weight or voltage.

Common applications include:

• Sport airplanes
• Warbirds
• Scale aircraft
• STOL aircraft
• Gliders
• Some EDF and pusher configurations

Battery weight and physical dimensions are especially important in airplanes because the pack position directly affects center of gravity.

RC cars and trucks

4S is a common performance level for larger RC cars and trucks. It can provide significantly more power than 2S or 3S while remaining easier to package than many 6S or 8S systems.

Typical 4S surface applications include:

• 1/8 buggies
• Truggies
• Monster trucks
• Bashers
• Speed-oriented builds
• Large short-course or desert-style vehicles

Hardcase construction is common where the battery is exposed to impacts, debris or chassis movement.

RC boats

Performance boats often use 4S because it provides a useful balance between voltage, battery weight and current demand.

As boat size and power requirements increase, many setups move to 6S or dual-battery configurations, but 4S remains an important platform for medium-size sport boats.

RC helicopters

4S packs are also used in electric helicopters, particularly where the model and motor system are designed specifically around this voltage class.

Helicopter battery choice is particularly sensitive to:

• Pack weight
• Center of gravity
• Motor KV
• Head speed target
• Current demand
• Battery dimensions

If your model is already designed around 4S, you can browse the CNHL 14.8V 4S LiPo Batteries collection to compare capacities, discharge ratings, case styles and connector options.

Why 4S Is Such a Popular Performance Sweet Spot

4S has enough voltage to support genuinely high-performance RC setups while still avoiding some of the extra battery weight and system complexity associated with 6S and 8S.

For many hobbyists, this makes 4S a useful long-term voltage rather than merely a stepping stone.

A well-matched 4S setup can provide:

• Strong acceleration
• High motor RPM potential
• Reasonable battery weight
• Broad charger compatibility
• Large battery selection
• Good packaging flexibility

The important phrase is well matched. A properly designed 4S system can perform better than a poorly matched 6S system, even though the 6S battery carries a larger voltage number.

4S Hardcase vs Softcase LiPo Batteries

Neither style is automatically electrically superior. Case construction should be chosen according to the physical demands of the model.

What Capacity Should a 4S LiPo Battery Have?

There is no single correct capacity for a 4S battery because the same voltage class covers everything from lightweight FPV drones to large RC cars.

Examples of commonly encountered capacities include:

• 850mAh
• 1300mAh
• 1500mAh
• 2200mAh
• 4000mAh
• 5000mAh
• 6000mAh
• 8000mAh and above

The capacity changes how much energy the battery stores, but larger packs also generally become heavier and physically larger.

Approximate stored energy

Battery energy can be estimated using nominal voltage:

More energy can increase potential runtime, but the heavier battery can also change handling, acceleration, aircraft center of gravity and overall efficiency. Capacity should therefore be selected within the model’s practical size and weight range.

What Does the C Rating Mean on a 4S LiPo?

The C rating does not determine whether a battery is 4S.

These specifications describe different things:

• 4S: Voltage class
• mAh: Capacity
• C rating: Manufacturer-specified discharge capability relative to capacity

Two batteries can both be 4S 5000mAh but differ significantly in discharge rating, internal resistance, wire gauge, connector, dimensions, case construction and weight.

A higher C rating does not increase the battery from 14.8V to a higher voltage class.

4S LiPo vs 4S LiHV: What Is the Difference?

This distinction becomes increasingly important because many modern FPV, airplane and performance battery ranges include both conventional LiPo and LiHV options.

Do not charge a standard 14.8V LiPo to 17.4V. LiHV charging should only be used when the battery is specifically designed and labeled for the higher voltage.

The RC model must also tolerate the LiHV pack’s higher fully charged voltage.

How Do You Charge a 4S LiPo Battery?

A conventional 4S LiPo should normally be charged using a balance charger with both the main power lead and balance connector attached.

1. Inspect the battery for swelling, damage or abnormal heat.
2. Select the correct LiPo chemistry mode.
3. Select Balance Charge.
4. Set the charger for 4S.
5. Select an appropriate charging current.
6. Connect the main power lead with correct polarity.
7. Connect the 4S balance plug.
8. Confirm that the charger detects four cells.
9. Remain present while the battery is charging.

Approximate 1C charge current

Approximately 1C is a conservative general starting point unless the battery specifies another permitted charge rate.

For the complete process, see the LiPo Battery Charging Guide.

How Many Charger Watts Does a 4S LiPo Need?

4S is where charger wattage becomes much more important, especially with larger RC car and boat batteries.

A 4S 2200mAh battery charged at approximately 1C requires near full voltage:

A 4S 5000mAh battery at approximately 1C requires:

A 4S 6000mAh battery at approximately 1C requires:

This means a charger that feels powerful when charging small FPV packs may reach its output limit when charging a large 4S car or boat battery.

For a more complete calculation, see How Many Watts Does My LiPo Charger Need?.

What Connectors Do 4S LiPo Batteries Use?

There is no universal connector for 4S.

Common examples include:

• XT30
• XT60
• XT90
• EC3 / IC3
• EC5 / IC5
• Deans / T-Plug
• Bullet connectors
• Other application-specific high-current connectors

Small FPV batteries may use relatively compact connectors, while high-capacity 4S car or boat packs may require larger connectors and heavier wire.

The connector should be selected according to the complete system rather than voltage alone.

3S vs 4S LiPo: What Changes?

Moving from 3S to 4S raises standard nominal voltage from 11.1V to 14.8V and full-charge voltage from 12.6V to 16.8V.

The extra cell does more than add 3.7V to the nominal specification. It can change motor RPM, heat, current behavior and the overall feel of the model.

Read 3S or 4S? A Guide to Choosing the Right Battery Without Frying Your Gear for the full comparison.

4S vs 6S LiPo: Which Direction Makes Sense?

Moving from 4S to 6S is a larger jump:

• 4S: 14.8V nominal / 16.8V fully charged
• 6S: 22.2V nominal / 25.2V fully charged

6S can provide more voltage headroom and, for a given power target, may allow the system to produce that power with less current. This can be useful in larger aircraft, EDF jets, powerful RC cars and demanding FPV setups.

However, 6S batteries are usually heavier and the supporting electronics must be designed for the higher voltage.

A model that already performs properly on 4S does not automatically improve simply because a 6S battery can physically fit.

For the full decision process, read 4S vs 6S LiPo Battery: Which One Makes More Sense for RC Models?.

Can You Use 4S Instead of 3S?

Only when the complete power system is designed to support 4S.

A fully charged 3S pack reaches approximately 12.6V, while a fully charged 4S pack reaches approximately 16.8V. That is a substantial increase.

A 3S-only ESC, motor or other component may be damaged by 4S voltage.

Do not use connector compatibility as proof of voltage compatibility.

Can You Use 4S Instead of 6S?

Sometimes, if the model and electronics support both voltage levels.

Compared with 6S, a 4S pack may reduce maximum motor RPM and performance potential. It may also be lighter and easier to fit.

Whether this produces a useful setup depends on:

• Motor KV
• ESC operating range
• Propeller or fan load
• Vehicle gearing
• Model weight
• Required performance

A platform designed specifically around 6S may feel underpowered on 4S even if the electronics technically operate at the lower voltage.

What Does 4S1P Mean?

A pack marked 4S1P contains four series cell groups with one parallel path.

• 4S: Four cell groups in series
• 1P: One parallel path

A 4S2P battery can have a different internal cell arrangement and larger total capacity, but it remains a 4S voltage system because the series count is still four.

How to Choose the Right 4S LiPo Battery

The best 4S battery is therefore not simply the highest-capacity or highest-C pack. It is the battery whose voltage, size, weight, connector and electrical capability match the actual model.

Once you have confirmed that your model is designed for 4S, browse the 4S LiPo battery collection to compare practical capacities, connectors, case styles and discharge options.

Common 4S LiPo Battery Mistakes

• Thinking 4S means 4 amps: S refers to series cell count, not charging or discharge current.
• Installing 4S in a 3S-only model: The additional voltage can exceed the limits of the ESC or motor.
• Assuming every 4S battery fits every 4S model: Pack dimensions and weight vary dramatically.
• Buying only by mAh: A larger pack may be too heavy or physically too large.
• Ignoring charger power: Large 4S packs can exceed the practical output of small chargers.
• Confusing LiPo with LiHV: Standard 4S and 4S LiHV have different maximum charging voltages.
• Choosing a connector only because it physically fits: Connector current capability also matters.
• Assuming 6S is automatically better: Higher voltage is useful only when the model benefits from it.
• Ignoring center of gravity: Battery weight and placement can significantly affect aircraft and helicopter handling.
• Leaving a fully charged pack unused for long periods: Use Storage mode when the battery will not be used soon.

4S LiPo Battery FAQ

What does 4S mean on a LiPo battery?

4S means the battery contains four lithium-polymer cell groups connected in series.

How many volts is a 4S LiPo battery?

A standard 4S LiPo is rated at 14.8V nominal and reaches approximately 16.8V when fully charged.

Is a 4S LiPo 14.8V or 16.8V?

Both numbers describe the same standard battery at different states of charge. 14.8V is the nominal rating, while approximately 16.8V is the fully charged voltage.

What is the storage voltage for a 4S LiPo?

Many chargers use approximately 3.8–3.85V per cell, giving a typical 4S storage range of about 15.2–15.4V.

What is a 4S LiPo used for?

4S batteries are widely used in FPV drones, RC airplanes, performance RC cars, boats and electric helicopters.

Is 4S good for FPV?

Yes. 4S remains an important FPV voltage platform, especially for quads designed around 4S motor KV and battery weight.

Does a 4S LiPo need balance charging?

Yes. A conventional 4S pack has four series cell groups, so Balance Charge allows the charger to monitor and balance the four individual cell voltages.

What amp setting should I use for a 4S 2200mAh battery?

At approximately 1C, the charge current is 2.2A.

What amp setting should I use for a 4S 5000mAh battery?

At approximately 1C, the charge current is 5A.

How many watts are needed to charge a 4S 5000mAh battery at 1C?

Near full voltage, approximately 16.8V × 5A = 84W of ideal battery-side charging power is required.

What is the difference between 4S LiPo and 4S LiHV?

A standard 4S LiPo is typically 14.8V nominal and 16.8V fully charged. A 4S LiHV is commonly rated around 15.2V nominal and may charge to approximately 17.4V when the battery specifically permits it.

Can I use 4S instead of 3S?

Only if the complete power system explicitly supports 4S voltage.

Is 6S better than 4S?

Not automatically. 6S provides higher voltage and more headroom, while 4S often offers lower battery weight, easier fit and simpler system requirements. The correct choice depends on the platform.

What capacity 4S battery should I buy?

Choose capacity according to the model’s battery compartment, weight limit, current demand and desired runtime. A larger mAh number is not automatically a better battery choice.

Final Recommendation

A standard 4S LiPo battery contains four series-connected cell groups, is rated at 14.8V nominal and reaches approximately 16.8V when fully charged.

Its biggest strength is versatility. 4S can power everything from compact FPV drones and RC airplanes to performance cars, boats and helicopters. But that versatility does not mean every 4S pack is interchangeable.

Start by confirming that the model genuinely supports 4S. Then match capacity, dimensions, weight, connector, case construction and discharge capability to the application.

If you are deciding whether to move up from 3S, read 3S or 4S? A Guide to Choosing the Right Battery Without Frying Your Gear. If you are considering moving beyond 4S, continue with 4S vs 6S LiPo Battery: Which One Makes More Sense for RC Models?.

For the full voltage picture, return to the LiPo Battery Voltage Guide: 1S to 8S Explained for RC Models.