DIY USB-C Power Bank Module for 3S, 4S or 5S Batteries
Build USB charging connections into a custom battery project without assembling each port circuit separately. This power-bank board is for compatible series-connected lithium battery packs in 3S, 4S or 5S configurations. It is for experienced electronics builders, not a finished portable charger.
- ✅ Plan several device connections — Two USB-C and two USB-A ports share one board layout.
- ✅ Check the charge indication during use — The onboard percentage display can remain visible through your enclosure.
- ✅ Reuse the USB-C connection for charging — Bidirectional operation lets compatible USB-C equipment charge the battery project.
- ✅ Choose the board for your battery layout — Separate 3S, 4S and 5S selections match different series-pack plans.
A charging board for a carefully built battery project
The module provides the USB connections, a charge-percentage display and configuration controls for a custom power bank. Batteries, enclosure, wiring and the mechanical arrangement remain part of your own build.
Choose the 3S 65W, 4S 100W or 5S 100W option to match the series pack. Output depends on the selected configuration, battery capability, cable and charging protocol; the option name is not a promise of the same output from every port.
Assembly requires suitable soldered power wiring, correctly connected balance leads and battery-specific settings. Follow the supplied board diagram for the actual configuration. One module and a 15cm equalising cable are included; cells, enclosure, charging adapter and solar panel are not included.
The board combines USB ports, a display and configuration controls.
Two USB-C and two USB-A sockets share the board.
Match the settings to the chosen series battery pack.
Identify the terminals before planning the enclosure.
Battery and balance connections must follow the correct diagram.
The five-series diagram applies to a matching 5S build.
The three-series diagram applies to a matching 3S build.
The four-series diagram applies to a matching 4S build.
Technical details
- Product: DIY power-bank charging module
- Available options: 3S 65W, 4S 100W or 5S 100W
- Battery arrangement: compatible series-connected lithium pack
- USB ports: 2 USB-C and 2 USB-A
- USB-C operation: bidirectional charging
- Indication: onboard percentage display
- Configuration: board controls and battery-specific wiring required
- Assembly: soldering and correct balance connections required
- Package: 1 module and 15cm equalising cable
- Exclusions: batteries, enclosure, charger and solar panel not included
Match the module to your series pack and make it the charging interface for your next carefully planned build.
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