A device may need longer operating time without requiring a higher battery voltage. Increasing the number of cells in series raises the voltage supplied to the device, while a parallel battery structure increases capacity without changing the nominal voltage. The 18650 1S4P Battery Pack combines four rechargeable 18650 lithium-ion cells in parallel. It provides a nominal voltage of 3.6V, a rated capacity of 10400mAh, and 37.44Wh of energy. This 10400mAh rechargeable 18650 pack is designed for low-voltage electronic products that need more available energy than a single cylindrical cell can provide.
What Makes the 18650 1S4P Battery Pack Different?
The term 1S4P explains the electrical arrangement of the four cells.
“1S” means the pack contains one series group. Its output therefore remains at the voltage level of a single lithium-ion cell. The battery supplies 3.6V nominally and reaches 4.2V when fully charged.
“4P” means four cells are connected in parallel. Their capacities are combined while the voltage remains unchanged, giving the finished pack a rated capacity of 10400mAh.
This structure works well when an existing device already operates from a single-series lithium-ion system but needs longer runtime. It increases the stored energy without requiring the power circuit to handle the higher voltage of a 2S, 3S, or 4S battery pack. Parallel cells must be properly matched during assembly. Differences in cell voltage, capacity, or internal resistance can affect how evenly the cells share the load. A matched four-cell assembly supports more consistent charging and discharging throughout the battery pack.
How Does the 18650 1S4P Battery Pack Extend Runtime?
Battery capacity shows how much charge the pack can store, while watt-hours provide a clearer way to understand the total energy available to the device.
This battery stores 37.44Wh of rated energy:
3.6V × 10.4Ah = 37.44Wh
A device consuming an average of 5W could have a theoretical runtime of approximately 7.5 hours. At an average load of 10W, the theoretical runtime would be approximately 3.7 hours. Actual runtime will normally be lower because the complete system may experience voltage-conversion losses, standby consumption, battery cut-off limits, temperature changes, and capacity reduction over time.
The operating pattern also affects runtime. Equipment with a stable load behaves differently from products containing motors, pumps, heating elements, or wireless transmitters that create short current peaks. Capacity may be sufficient while the discharge capability is not, so current demand and runtime should be evaluated separately.
Which Devices Can Use This Battery Pack?
The battery pack can support products designed around a single-series rechargeable lithium-ion power system.
Possible applications include:
- Portable monitoring equipment
- Handheld measuring instruments
- Communication terminals
- Remote sensing devices
- IoT equipment
- Data collection products
- Portable testing equipment
- Small backup power modules
- Low-voltage control systems
The battery should not be selected by capacity alone. A compatible device must accept the complete battery voltage range, including the 4.2V full-charge voltage. Its charging circuit must also support a single-series lithium-ion battery. The pack measures approximately 37.5 × 37.5 × 66mm and weighs about 180g. The enclosure should provide sufficient space for the battery, PCM, insulation, wires, connector, and safe cable routing. Other cylindrical lithium battery packs are available when a device requires another capacity, voltage, cell format, or assembly structure.
Protection and Charging Requirements
The battery pack includes an XR-3575-5M PCM. The protection circuit helps manage overcharge, over-discharge, overcurrent, and short-circuit conditions during charging and operation. These protection functions act as safeguards when the battery moves outside its intended operating range. They do not replace the charging circuit or the device’s power-management system.
The battery requires a CC/CV charging method with a full-charge voltage of 4.2V. The charging current should be selected according to the approved cell specification, PCM capability, connector rating, wire gauge, thermal conditions, and required charging time. The listed overcurrent protection range describes the point at which the PCM may disconnect the load. It should not be treated as the recommended continuous operating current. The continuous and peak current capability also depends on the selected cells, protection components, wires, connector, temperature, and load duration. Product development may also need to consider suitable battery safety testing, certification requirements, transportation conditions, and regulations in the intended market.
For equipment with changing or high startup loads, testing should cover:
- Normal operating current
- Maximum continuous current
- Startup or transmission peaks
- Peak duration
- Voltage drop under load
- Battery and PCM temperature
These tests help confirm whether the pack can support the actual operating load rather than only meeting the required capacity.
How to Integrate the 18650 1S4P Battery Pack?
The standard configuration uses red and black 22AWG wires with a 2.54mm terminal connection. An NTC temperature sensor and identification resistor are not included in the standard configuration. The electrical interface should be checked before sample production. Connector housings may look similar while using different terminal spacing, locking structures, or polarity arrangements. A connector drawing or physical sample helps prevent incorrect matching. Installation requirements can be handled through a custom lithium battery solution that adjusts the connection, protection, insulation, and assembly details around the final device design.
Available adjustments may include:
- Connector type
- Wire length and gauge
- Positive and negative polarity
- Wire exit direction
- Insulation material
- PCM configuration
- NTC temperature sensing
- Identification resistor
- Product label
- Outer packaging
The battery compartment should secure the pack without applying excessive pressure to the cells or protection components. Additional foam, brackets, sleeves, or fixing materials may be needed when the device will experience movement or vibration. The device specifications should confirm input voltage, average current, peak current, expected runtime, charging method, connector design, installation dimensions, working temperature, and available space before production.
The 18650 1S4P Battery Pack Fits Long-Runtime Designs
The 18650 1S4P Battery Pack provides 10400mAh capacity and 37.44Wh of energy within a compact four-cell cylindrical structure. Its parallel configuration increases the available runtime while maintaining a nominal voltage of 3.6V. Built-in PCM protection and adjustable connection details make the pack easier to integrate into portable monitoring equipment, communication devices, IoT products, testing instruments, and low-voltage backup modules. The voltage range, continuous current, peak load, charging circuit, connector, dimensions, operating temperature, and installation method should be evaluated together. When these requirements match the device, the battery pack provides a practical combination of extended runtime, compact construction, electrical protection, and flexible integration.