2Pcs 18650 Battery Holder Li-ion Battery with Single Compartment, 18650 battery bank & battery backup

What buyers think

Buyer-review evidence is mixed but generally points to solid usefulness for small electronics. Many comments describe it as an affordable, easy-to-deploy 18650 power supply for DIY projects, including setups that run LEDs or other small loads for hours. Several buyers highlight that the board offers both charging and powering, and they like having both 3V and 5V options available through the module.

At the same time, review evidence includes concerns about drain and standby behavior. One review reports the battery draining faster than it charges, attributing this to the LEDs and board overhead, plus uncertainty due to limited documentation. There are also mentions that soldering quality can be hit-or-miss, suggesting buyers may want to be comfortable with DIY assembly and testing.

What this is, and how it fits DIY projects

This product is essentially a compact “battery bank” solution built around a single 18650 lithium-ion cell. It pairs the holder with a shield-style module that handles protection, charging input (micro-USB), and regulated outputs through USB connections. It is aimed at makers who want a quick way to power small devices without designing battery management from scratch.

Key features and specifications that matter

Single-cell 18650 holder

The board is designed for one 18650 rechargeable cell (18650 battery not included). If your project already uses an 18650 cell, this simplifies the physical mounting and battery connection part of the build.

Charging input and USB output

• Input: micro-USB charging port.
• Outputs: Type A USB output with selectable 5V/2A and 3V/1A modes.
• Supported input range: 5 to 8V input voltage (useful for charging setup choices).

Protection and power control

It includes protection features designed to help manage overcharge and overdischarge conditions. Output control is handled by:

• A push button for turning USB output on and off (single push on, two pushes off).
• A slide switch that enables a power-save mode, with guidance that the output should stay on for very light loads only when power save is turned off.

Can you charge and power at the same time?

The module is intended to be able to run your project while the 18650 is charging, which can be useful for builds that need continuous operation during charging.

Pros and cons for different types of buyers

Best for

• DIY electronics beginners to intermediates who want a simple 18650 power module with regulated USB output and basic protection.
• Portable LED and small accessory projects, where 3V or 5V USB power is a straightforward match.
• Prototype builders who prefer quick assembly and want an on-board way to handle charge and discharge protection.

Who should think twice

• Projects with ultra-low power standby needs (for example, long-term sensing) if you are sensitive to board overhead, indicator drain, or standby behavior. Review evidence suggests overhead can affect runtime.
• Buyers who need detailed technical documentation such as exact charge-time expectations and measured self-consumption, because some feedback indicates documentation is not very detailed.
• Anyone not comfortable inspecting solder pads and making clean connections, since assembly quality can be inconsistent in at least some cases.

How to use it in a typical setup

1. Use a compatible 18650 cell and insert it according to the battery holder polarity markings.
2. Connect your device to the USB output, then select the appropriate output mode (3V versus 5V).
3. Turn output on/off using the push button, and consider the slide switch for power-save behavior with light loads.
4. Charge via micro-USB and, if needed for your build, use the setup in a “charge while powering” style workflow.

Battery holder buying guide: what to check before you buy

• Cell compatibility: Confirm the holder is for a single 18650 cell and that you have the right size and chemistry of rechargeable battery.
• Voltage you actually need: If your project uses 5V (or a 3V rail), pick the module mode that matches. This board supports both 5V/2A and 3V/1A outputs, but your device must be compatible.
• Runtime expectations: If your design relies on very low power or long shelf time between charges, treat “board overhead and indicator drain” as a real factor.
• Switching and standby behavior: Pay attention to how output is enabled, plus how “power save mode” behaves with low-current loads.
• Assembly quality: If you plan to solder to the module, be ready to handle imperfect solder joints or connection variability.

Price and availability

It is currently listed as available in the United States, and it comes as a 2-pack. If you are comparing value, look at total cost versus whether you need one module or multiple power points for different DIY devices.

Alternatives to consider

• Dedicated 18650 USB power banks: Choose these if you want a more consumer-style experience (usually less DIY assembly and often more consistent behavior for everyday use).
• Generic 18650 charger boards plus separate buck converters: Consider this if you want tighter control over regulator selection, or if your project needs a very specific voltage rail and you prefer modular components.
• Low-power battery management modules: If your priority is long-term low standby power, look for modules that specifically target low quiescent current (and check for measured standby draw).

Verdict

This 2-pack 18650 battery holder with a charging and USB output shield is a practical choice for small DIY builds that need simple, selectable 3V or 5V USB power from a single 18650 cell. It stands out for convenience, built-in protection, and the ability to power while charging, but buyers should plan around possible battery drain from the module overhead and ensure they are comfortable with DIY assembly.

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