Battery Pack Configuration Guide: How to Choose the Right S and P Configuration for Lithium Batteries

Choosing the right Battery Pack Configuration is essential when developing a customized lithium battery solution. The way battery cells are connected directly affects the pack’s voltage, capacity, power output, and compatibility with the final application.

For brand owners and equipment manufacturers, understanding lithium battery pack configuration helps ensure the battery system matches product requirements, whether for industrial equipment, marine applications, mobility solutions, or energy storage systems.

A battery pack configuration mainly consists of two connection methods: series connection (S), which determines voltage, and parallel connection (P), which determines capacity and runtime.

This guide explains how S and P configurations work, common setups such as 12S and 16S LiFePO4 battery packs, and how to choose the right configuration for your customized battery project.

What Is Battery Pack Configuration?

Battery Pack Configuration refers to how individual battery cells are connected to achieve the required voltage, capacity, and performance for a specific application.

In lithium battery design, two main connection methods determine the battery characteristics:

• Series connection (S) increases battery voltage 
• Parallel connection (P) increases battery capacity and runtime 

By combining different S and P configurations, battery manufacturers can develop customized battery packs for various applications, from portable devices to industrial equipment and energy storage systems.

For brands, understanding battery pack configuration helps ensure the selected battery solution matches product requirements in terms of performance, reliability, and compatibility.

Understanding Series Configuration (S)

What Does "S" Mean in Battery Packs?

In a lithium battery pack, "S" refers to the series configuration, which defines the number of battery cells connected in series. When cells are connected in series, their voltages are added together, while the battery capacity (Ah) remains unchanged.

For LiFePO4 batteries with a nominal cell voltage of 3.2V, different series configurations create different voltage platforms:

The series configuration determines the battery voltage and should be selected based on the requirements of the final product system.

For example, many 48V-class applications use 16S LiFePO4 battery configurations because they provide a 51.2V nominal voltage platform that matches common system requirements.

Understanding Parallel Configuration (P)

What Does "P" Mean in Battery Packs?

In a lithium battery pack, "P" refers to the parallel configuration, which defines how many identical cell strings are connected together to increase battery capacity and available energy.

When battery cells are connected in parallel:

• Battery capacity (Ah) increases 
• Available energy increases 
• The battery voltage remains unchanged 

Unlike the series configuration (S), which determines the battery voltage platform, the parallel configuration mainly affects how much energy the battery can store and how long the product can operate.

The relationship can be expressed as:

Battery Capacity = Cell Capacity × Number of Parallel Strings

For customized lithium battery solutions, manufacturers can adjust the parallel configuration according to the required runtime, energy capacity, and product requirements while maintaining the same voltage platform.

How Parallel Configuration Affects Battery Capacity

For example, using 100Ah LiFePO4 cells:

Both configurations use the same 16S series connection, so the battery voltage remains at 51.2V.

The difference is the parallel configuration:

• 16S1P uses one parallel string and provides lower capacity
• 16S2P uses two parallel strings and provides twice the capacity

This means a 16S2P battery pack can store more energy and support longer operating time without changing the voltage platform required by the equipment.

For brands developing battery-powered products, increasing the parallel configuration is usually considered when the product requires longer runtime, higher energy storage capacity, or reduced charging frequency.

However, adding more parallel strings also increases battery size, weight, and cost. Therefore, the final configuration should be selected based on the actual product requirements, installation conditions, and target market positioning.

Common Lithium Battery Pack Configurations

Different applications require different lithium battery pack configurations based on their voltage, capacity, and performance requirements.

For LiFePO4 batteries, common series configurations include 4S, 8S, 12S, and 16S battery packs. By adjusting the number of cells connected in series and parallel, manufacturers can create battery solutions with different voltage platforms and energy capacities.

The table below shows several widely used lithium battery configurations:

A 12S battery pack uses 12 LiFePO4 cells connected in series to provide a 38.4V nominal voltage platform, making it suitable for applications that require a balance between power output and system size.

A 16S LiFePO4 battery uses 16 cells connected in series to provide a 51.2V nominal voltage platform, which is widely used in 48V-class lithium battery systems, including energy storage and industrial applications.

Beyond the series configuration, battery manufacturers can also adjust the parallel configuration to increase capacity and runtime while maintaining the required voltage platform.

For example, a 16S battery pack can be customized with different parallel configurations to meet different energy requirements without changing the system voltage.

How to Choose the Right Battery Pack Configuration?

For battery-powered product brands, selecting the right battery pack configuration is an important decision that directly affects product performance, customer experience, and market positioning.

The best battery solution is not always the one with the highest capacity or largest battery size. Instead, brands need to choose a configuration that matches their product requirements, including expected usage time, power demand, product size, cost target, and future expansion needs.

A typical selection process starts by defining the required voltage, calculating the necessary energy capacity, evaluating power requirements, and confirming compatibility with the complete system.

Determine the Required Voltage (Series Configuration – S)

The first step in selecting a battery configuration is determining the required voltage platform for the product.

The series configuration defines the battery voltage and should match the requirements of the final application. Selecting the correct voltage platform helps ensure product compatibility and avoid potential redesign during development.

For example, many 48V-class applications use 16S LiFePO4 battery configurations, which provide a 51.2V nominal voltage platform suitable for a wide range of energy storage and industrial applications.

When working with a battery supplier, brands should confirm the required voltage platform at the early development stage to ensure the battery solution matches the product requirements.

Determine the Required Battery Capacity (Parallel Configuration – P)

After confirming the voltage platform, the next step is deciding how much energy the battery needs to store.

Battery capacity mainly determines how long the product can operate or how much energy it can provide.

The basic calculation is:

Required Energy (kWh) = Power Consumption (kW) × Operating Time (h)

For example, if a residential energy storage product needs to provide 5kWh of usable energy, a 51.2V battery system would require approximately:

5000Wh ÷ 51.2V ≈ 100Ah

If more energy storage is required, additional battery modules can be connected in parallel to increase total capacity.

However, increasing battery capacity also affects product cost, size, weight, and installation requirements. For brands, the goal is not to maximize battery capacity, but to find the configuration that best matches customer needs and product positioning.

Evaluate Power Requirements and Battery Performance

Capacity determines how long a product can operate, but it does not fully determine whether the battery can support the required performance.

Some applications require higher power output, especially products using motors, inverters, or other components with sudden power demand.

For example, a home energy storage system may have enough capacity for daily energy usage, but the battery still needs sufficient discharge capability to support high-power appliances during backup operation.

Therefore, brands should confirm both the expected energy requirement and the peak power demand when selecting a battery solution. The battery solution should provide sufficient power output to support the product’s operating requirements.

Confirm BMS and Charging Compatibility

For customized battery solutions, the battery pack, BMS, and charging system need to work together as one complete solution.

Instead of selecting these components separately, brands should work with an experienced battery supplier to ensure the battery system is compatible with the final product requirements.

A reliable battery partner can help evaluate the required configuration, charging solution, and system compatibility during the development process, reducing integration issues and improving product reliability.

Consider Product Positioning and Application Environment

Battery configuration should also match the final product strategy.

A portable energy storage product may prioritize compact size and easy transportation, while a commercial energy storage system may focus more on higher capacity and long-term reliability.

Product size, installation conditions, target market requirements, and certification needs should all be considered before finalizing the battery solution.

By evaluating these factors at the beginning of product development, brands can reduce redesign risks and create a battery product that better fits customer expectations.

Customize the Right Battery Pack Solution with ACE Battery

Choosing the right battery configuration requires more than selecting voltage and capacity. ACE Battery helps brands develop customized lithium battery solutions based on product requirements, including energy needs, application conditions, and system compatibility.

From configuration design and BMS integration to testing and production support, ACE Battery helps transform product concepts into reliable battery solutions.

Contact ACE Battery to discuss your customized battery pack requirements.