Lithium-ion battery packs are essential power sources used in medical equipment, drones, robots, and countless other devices. These packs are made of multiple Li-ion cells (like 18650 or 21700) connected in series and/or parallel to provide specific voltages and capacities.

Whether you need a 7.4V, 11.1V, or 14.8V battery pack, understanding their structure, chemistry, and configuration is crucial. In this guide from A&S Power, we’ll explain the different types of Li-ion battery packs, help you compare cell sizes, and show how to choose the right one.

Cell Types Commonly Used in Battery Packs

• 18650 Battery Pack:
  The most widely used cylindrical cell (18mm x 65mm). Used in laptops, flashlights, power tools. A 18650-based battery pack typically offers 2000–3500mAh per cell.

• 21700 Battery Pack:
  Larger than 18650, with better energy density (up to 5000mAh per cell). Ideal for drones, e-bikes, power tools.

• 32700 Battery Pack:
  High-capacity, large-diameter cells (32mm x 70mm). Suitable for solar energy storage, UPS, and backup systems.

⚙️ Popular Battery Pack Voltages Explained

• 7.2V vs 7.4V Battery Pack

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• Modern 7.4V packs (2S Li-ion) are widely used in RC toys, small robots. “7.2V” is a legacy term from NiMH/NiCd batteries.

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• 11.1V Battery Pack (3S)
   

• Made of 3 cells in series. This 11.1V Li-ion battery pack is perfect for drones, GPS trackers, and medical devices needing 12V range.

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• 14.8V Battery Pack (4S)
   

• A 4S configuration with 4 cells in series. This 14.8V battery pack is used in e-scooters, e-bikes, and industrial applications.

Custom Battery Pack Solutions

Custom battery packs can be tailored to your device’s size, voltage, connector, or even discharge rate. A&S Power offers full customization with options like:

• Series/parallel layout (e.g. 4S2P)

• 18650 / 21700 / 32700 cell formats

• BMS (battery management system)

• Specific connector types (Molex, JST, etc.)

Our Lithium Ion Battery Pack catalog includes solutions for medical, IoT, robotics, and industrial devices.

Where Are Li-ion Battery Packs Used?

How to Choose the Right Battery Pack

1. Voltage (V): Match the system (e.g. 11.1V = 3S).

2. Capacity (mAh): Determine runtime.

3. Current (C-rating): Match peak power requirements.

4. Size/Shape: Ensure the battery fits your product housing.

5. Safety & BMS: Always include proper protection.

A well-designed Li-ion battery pack ensures long cycle life, thermal stability, and safe discharge—even under demanding loads.

Conclusion: Your Reliable Battery Partner

Whether you need a compact 7.4V 18650 battery pack for an IoT device, or a high-capacity 14.8V 18650/21700 pack , A&S Power offers proven solutions backed by years of R&D and manufacturing experience.

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