The 2S 7.4V 18650 Li-ion Battery Pack with 8.4V Polymer Cell & Protection Circuit is a complete, ready-to-use battery solution designed for high-drain applications requiring reliable, protected power. It combines two 18650 lithium-ion cells in a 2S configuration with an integrated 8A continuous / 16A peak protection circuit, making it an ideal power source for portable electronics, RC vehicles, power tools, and DIY projects.
At the heart of the pack is a 2S (2-cell series) configuration, providing a nominal voltage of 7.4V and a full charge voltage of 8.4V. This voltage is compatible with a wide range of devices designed for 2S lithium power, including RC cars, drones, portable speakers, and DIY power banks.
The integrated protection circuit continuously monitors the voltage of each cell and the total pack current, disconnecting the load or charger if any parameter exceeds safe limits. This protects both the battery pack and your connected devices from damage, extending battery lifespan and ensuring safe operation.
The protection circuit provides three critical protection functions:
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Overcharge protection — Disconnects the charger when any cell voltage reaches approximately 4.25V to 4.3V, preventing damage from excessive charging.
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Over-discharge protection — Disconnects the load when any cell voltage drops to approximately 2.5V to 3.0V, preventing deep discharge that can permanently damage the battery.
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Overcurrent protection — Disconnects the output when current exceeds 8A continuous or 16A peak, protecting against short circuits and excessive loads.
The 8A continuous / 16A peak rating makes this pack suitable for high-drain applications such as power tools, RC vehicles, and high-power portable devices. The 16A peak rating provides a safety margin for brief current surges, while the 8A continuous rating ensures reliable operation under sustained loads.
The pack features a solder pad or connector design for easy integration into your project. The compact form factor is sized to fit into battery compartments and custom enclosures. The pack includes B+, B-, BM (mid-point), P+, and P- connections for battery and output.
The “18650” designation indicates the pack uses standard 18650 lithium-ion cells, which are widely available, reliable, and offer excellent energy density. The “Polymer Cell” reference indicates compatibility with lithium-polymer cells as an alternative, providing flexibility in cell selection.
Important Note: This battery pack is designed for 2S (2-cell) 7.4V applications. Always verify the voltage and current ratings match your application before installation. Use an appropriate 2S lithium battery charger with balance charging capability.
Whether you are building a custom power bank, powering an RC vehicle, or designing a portable device, the 2S 7.4V 18650 Li-ion Battery Pack with Protection Circuit provides a reliable, protected power solution. It is suitable for individual makers, students, and businesses purchasing in bulk for product development or educational programs.
Features
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2S dual-cell configuration — Provides 7.4V nominal / 8.4V full charge voltage
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8A continuous / 16A peak protection — High-current capability for demanding applications
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Comprehensive protection — Overcharge, over-discharge, and overcurrent protection
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Cell balancing — Ensures even charge and discharge across both cells
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18650 cell compatibility — Uses standard, widely available lithium-ion cells
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Polymer cell compatible — Flexible cell selection for different requirements
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Compact form factor — Sized for battery compartments and custom enclosures
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Wide application range — Power tools, RC vehicles, portable devices, DIY projects
Technical Specifications
| # | Parameter | Specification |
|---|---|---|
| 1 | Configuration | 2S (2-cell series) |
| 2 | Nominal Voltage | 7.4V |
| 3 | Full Charge Voltage | 8.4V |
| 4 | Cell Type | 18650 Li-ion / Polymer compatible |
| 5 | Continuous Discharge Current | 8A |
| 6 | Peak Discharge Current | 16A |
| 7 | Protection Functions | Overcharge, over-discharge, overcurrent |
| 8 | Connection Type | Solder pads or connector (variant dependent） |
