Portable DIY Power Bank Kit with Dual Charging and Individual Battery Monitoring

This versatile mobile power solution combines the functions of a customisable power bank and dedicated battery charger in one compact unit. Measuring 100 x 84 x 26 mm, the device enables you to build your own portable power supply using standard 18650 lithium-ion batteries, determining both capacity and battery quality according to your requirements. The dual-input design accepts power via either an 8-pin connection or Micro USB port, while dual output ports deliver DC 5V at 1A and 2A respectively for charging multiple devices simultaneously. Each of the four battery slots operates independently, allowing simultaneous charging and discharging operations without circuit interference.

Features and Construction

The power box incorporates several practical features designed for flexible power management and safe operation. Its construction centres around independent circuit architecture that maintains separation between battery functions.

Material and Build

The unit features a plastic housing containing the electronic circuitry and battery contacts. The internal design includes reverse polarity protection that automatically identifies and cuts power to any incorrectly inserted 18650 cells while maintaining normal operation for remaining circuits. This safety feature displays an empty battery level indication for affected cells without disrupting other functions. The construction prioritises clear functional separation between charging and discharging pathways.

Size and Practical Fit

With dimensions of 100 mm in length, 84 mm in width, and 26 mm in depth, the compact form factor makes this power bank easily portable while accommodating four standard 18650 batteries. The physical design accommodates the dual input ports (8-pin and Micro USB) and dual output ports in a layout that prevents cable interference. The unit's proportions allow it to fit comfortably in bags or pockets alongside the devices it powers.

Uses and Placement

This product serves multiple functions depending on battery installation and connection method, making it suitable for various power management scenarios.

Event or Professional Use

For events or professional settings requiring extended power availability, the custom capacity capability allows users to select high-quality 18650 cells matching their runtime requirements. The dual output ports enable simultaneous charging of presentation equipment and mobile devices, while the independent circuits ensure charging operations can continue even while powering equipment. The LCD displays provide immediate visibility of remaining power across all four batteries, allowing for proactive battery management during extended use.

Everyday Home Use

In domestic environments, the unit functions as both a household power bank for phones and tablets and a maintenance charger for 18650 batteries used in other devices. The reverse polarity protection offers safety assurance when changing batteries, particularly useful for households with multiple users. The Micro USB input makes charging convenient using common phone chargers, while the ability to monitor individual battery health via the LCD screens helps maintain battery performance over time.

Benefits and Buying Value

The product's value derives from its dual functionality, customisation potential, and practical safety features that address common power management considerations.

Reuse and Low Maintenance

The design encourages reuse of quality 18650 batteries and provides tools to monitor their condition, potentially extending usable lifespan through proper maintenance. The independent circuits mean individual battery failure doesn't disable the entire unit, allowing continued operation with remaining functional cells. The clear capacity monitoring supports timely recharging decisions, preventing complete discharge that can shorten battery life.

Why Choose This Product

This power box offers distinct advantages for users seeking control over their portable power specifications. The ability to select your own 18650 batteries addresses concerns about false capacity claims or inferior quality cells sometimes found in pre-assembled power banks. The simultaneous charge and discharge capability provides operational flexibility unavailable in many single-function units. The individual battery monitoring via LCD displays delivers precise power management information typically found only in more expensive professional equipment.