A battery holder for Lithium-Ion 18650 2-cell configurations is designed to securely hold and connect two 18650 Li-Ion batteries. Depending on your needs, you can find holders with different wiring configurations:
Types of 18650 2-Cell Battery Holders
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Series Connection (7.4V Output)
- Batteries are connected in series, doubling the voltage.
- Output: 7.4V (nominal), 8.4V (fully charged).
- Used in robotics, DIY power banks, and RC projects.
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Parallel Connection (3.7V Output)
- Batteries are connected in parallel, doubling the capacity.
- Output: 3.7V (nominal), 4.2V (fully charged).
- Ideal for increasing battery runtime at a fixed voltage.
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Open-Frame vs. Enclosed Design
- Open-Frame Holders: Exposed battery slots, easy to swap cells.
- Enclosed Holders: Protects batteries, often with a cover and lead wires.
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PCB-Mounted vs. Wired Holders
- PCB-Mounted: Designed for direct soldering onto circuit boards.
- Wired Holders: Comes with leads for easy connection.
Features to Look For
- Material: Heat-resistant ABS plastic or polycarbonate.
- Spring Contacts: Nickel-plated for better conductivity.
- Mounting Options: Screw holes, snap-in clips, or adhesive backing.
- Built-in Protection: Some holders have built-in overcurrent or polarity protection.