A Comprehensive Guide to Lipo Battery Sizes and Compatibility

Choosing the right lipo battery size can be overwhelming, but knowing the key differences can make all the difference.

The most common lipo battery sizes are 3S, 4S, and 6S, each with its own unique characteristics.

A 3S lipo battery is perfect for small drones and devices that require a compact design.

For larger drones and applications that need more power, a 4S lipo battery is often the better choice.

A 6S lipo battery offers the most power and is ideal for high-performance applications like racing drones.

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LiPo batteries are a popular choice for RC racing due to their high energy density. They store approximately 3x more energy per gram than NiMH batteries.

LiPo batteries use lithium-ion chemistry in a flexible polymer casing. This allows for custom shapes and sizes.

Multiple LiPo cells connect in series to create higher voltages. This is necessary for powerful motor systems used in competitive RC racing.

Professional RC racers rely exclusively on LiPo batteries for competitive advantage. They are used in IFMAR World Championships and EFRA European Championships.

Cylindrical lithium-ion batteries come in various standard dimensions, denoted by a combination of numbers showing their height, width, and thickness in millimeters.

The most commonly used lithium-ion cell sizes are 18650, 21700, and 26650. These sizes are widely used in different industries for a range of applications.

The 18650 battery size has a diameter of 18mm and a length of 65mm, with a capacity of 1500-3500mAh. It's commonly used in laptops, tools, e-bikes, and flashlights.

The 21700 battery size has a diameter of 21mm and a length of 70mm, with a capacity of 3000-5000mAh. It's often used in e-bikes, solar lights, and power tools.

Here's a list of common cylindrical lithium-ion battery sizes:

These battery sizes are widely used in various industries and applications.

The pouch is a type of battery enclosure that is commonly used in small electronics, like smartwatches and fitness trackers. It's usually a thin, flexible material that protects the battery from physical damage.

Pouch cells are often used in lithium-ion batteries, which are known for their high energy density and long cycle life. This makes them a popular choice for portable electronics.

The size of the pouch can vary, but it's often around 60-80 mm in length and 20-30 mm in width. This compact size makes it ideal for use in small devices.

A typical pouch cell has a thickness of around 0.1-0.3 mm, which is much thinner than other types of battery enclosures. This thinness allows for more efficient use of space in small devices.

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Battery sizes can be identified by their unique codes, such as 18650, 104050, and CR2032, which indicate the cell's physical characteristics. These codes can be broken down into diameter, length, and thickness.

To give you a better idea, here are some examples of battery size codes and what they mean:

These codes can help you quickly identify the cell's physical characteristics and choose the right battery size for your needs.

Battery sizes can be a bit confusing, but understanding the standard chart can help you navigate the world of batteries. The standard chart typically shows the dimensions and capacity of a battery.

A standard 1S battery has a nominal voltage of 3.7V. The capacity of a standard 1S battery can range from 300mAh to 650mAh.

The dimensions of a standard 1S battery can vary, but a common size is 8×20×30mm. The weight of a standard 1S battery can range from 4g to 11g.

Here's a breakdown of the standard 1S battery sizes:

The standard chart can also show the discharge rate of a battery, which is measured in C-ratings. A "100C" 2200mAh pack can deliver a theoretical 220A discharge, but real-world sustained discharge rarely exceeds 80% of claimed C-rating.

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The 870mAh battery size is a significant one, offering a decent amount of power for various devices. It's a popular choice for many applications.

This battery size has a voltage of 3.7V, which is a common standard for many electronic devices. The battery's capacity of 870mAh translates to a Wh rating of 3.219Wh.

If you're looking for a battery with a high capacity, the 870mAh size is definitely worth considering. Its weight is approximately 17.4g, which is relatively heavier compared to smaller battery sizes.

The 870mAh battery is often used in devices that require a moderate amount of power, such as wearable devices or small gadgets. Its dimensions are 3.7×32×58mm, which can be a consideration for device design.

Here's a comparison of the 870mAh battery with other sizes:

Keep in mind that this is just a brief comparison, and actual performance may vary depending on the specific application.

Standard lithium battery sizes may not suit all applications, so custom battery packs can be tailored to meet exact performance, size, and durability requirements.

You can choose from a range of special shaped battery series, including round Li polymer batteries, cylindrical & columnar Li polymer batteries, column lithium batteries, and ultra-thin Li polymer batteries.

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Professional RC racers in IFMAR World Championships and EFRA European Championships use LiPo batteries exclusively for competitive advantage, storing approximately 3x more energy per gram than NiMH batteries.

To build a custom lithium polymer battery pack, you can mix a combination of cells in series and in parallel to meet the voltage and capacity requirements for any electric RC airplane.

You can represent the specification of each LiPo battery pack using the standard xsyp naming scheme, where the "x" represents the number of cells in series and the "y" represents the number of cells wired in parallel.

For example, a battery pack with 3 cells in series and 2 cells in parallel would be represented as "3s2p".

Choosing the right LiPo battery size can be overwhelming, especially if you're new to the hobby.

You'll want to consider the application and the required voltage, energy, and physical constraints. For example, a micro drone might require a small battery with low voltage and capacity, while a heavy-lift drone needs a larger battery with higher voltage and capacity.

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Here are some common LiPo battery sizes and their typical applications:

Remember, a good rule of thumb is to choose a battery that's slightly larger than the minimum required, to ensure a safe and reliable operation.

Battery performance and requirements are crucial for a smooth RC experience. A perfect fit between your lipo battery and RC model unlocks speed and efficiency.

FPV racers, for example, require slim profiles for 1300–5200mAh 4S–6S packs, which typically measure 26×47×140mm. This size range allows for agile flight and quick maneuvers.

Cinematic drones, on the other hand, need larger frames to house 6S 6000mAh+ batteries, which can provide up to 30+ minutes of flight time. These frames measure around 36×48×155mm.

Micro models, however, require ultra-compact cells like 8×20×30mm (300mAh) for sub-100g drones. These tiny batteries enable incredibly lightweight and agile flight.

Here are some battery size requirements for different RC models:

Discharge Rate (C Rating) is a crucial aspect of battery performance. It determines the maximum safe current delivery of a battery.

To calculate maximum current, use the formula: C Rating × Capacity (Ah) = Maximum Amps. This is essential for ensuring safe operation of your battery and motor system.

For example, a Traxxas 5200mAh 35C battery has a maximum current of 182A (35 × 5.2A). Similarly, a Traxxas 5000mAh 25C battery has a maximum current of 125A (25 × 5A).

Higher C ratings indicate lower internal resistance and better performance, but be aware that manufacturers often overstate C-ratings by 30-50% for marketing purposes.

A Castle 4600KV motor requires a minimum 15C rating with a 4000mAh battery for safe operation. This means the battery should be able to handle a current of at least 60A (60A ÷ 4A = 15C).

Here's a list of examples to illustrate the calculation:

A 50% DoD means half the battery's energy was consumed.

Depth of Discharge, or DoD, is a critical measure of battery performance. It indicates how much battery capacity is used, and it's especially important for lithium-based batteries.

Lower DoD extends battery life. For example, if you're using a 50% DoD, your battery will last longer than if you were to use a 100% DoD.

Here's a simple way to think about it: the lower the DoD, the more life your battery will have.

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You can build a lithium polymer battery pack to meet the voltage and capacity requirements for any electric RC airplane by mixing a combination of cells in series and in parallel.

The specification of each LiPo battery pack can be represented by the standard xsyp naming scheme, where the "x" represents the number of cells in series and the "y" represents the number of cells wired in parallel.

LiPo batteries use lithium-ion chemistry in a flexible polymer casing that allows custom shapes and sizes, storing energy at 3.7V nominal voltage (4.2V fully charged, 3.0V minimum safe).

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Multiple cells connect in series to create higher voltages for powerful motor systems, but the capacity of the pack will NOT increase as cells are added in series.

To build capacity, cells are added together in parallel, which increases the capacity (energy) of the LiPo battery pack as more and more cells are added.

The voltage of a LiPo battery pack will NOT increase as cells are added in parallel, but the capacity will continue to increase.

You can tailor custom battery packs to meet exact performance, size, and durability requirements, making standard sizes may not suit all applications.

The voltage of a LiPo battery pack is determined by the number of cells in series, and each cell stores energy at 3.7V nominal voltage.

To build a battery pack with a higher capacity, you can add more cells in parallel, but the voltage will remain the same.

For example, adding three 2100mAh cells in parallel will result in a total capacity of 6300mAh, but the voltage will still be 3.7V.

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