4S 20V 5A Bidirectional Charge and Discharge Power Module
This 4S lithium-battery power module combines bidirectional buck-boost conversion, USB-C power delivery and USB output functions. It is intended for custom power banks, portable energy-storage projects and battery-powered equipment using a correctly protected 4-series-cell pack.
Power and Display Functions
- Maximum stated USB-C output: PD 100W, up to 20V at 5A on the designated Type-C output.
- Additional outputs: source information lists two USB-A outputs with up to 22.5W and a second Type-C output up to 20V at 3.25A.
- Charging inputs: Type-C inputs support the listed PD voltage profiles; the second Type-C input is listed up to 20V at 3.25A.
- Display: real-time battery percentage, voltage and current information.
- Operation: integrated buck-boost circuitry supports charge and discharge operation around the intended battery voltage range.
Select the Battery Version
- 16.8V: 4S lithium-ion battery configuration option.
- 14.6V: 4S lithium iron phosphate battery configuration option.
- 100W: high-power PD 100W configuration option.
These options correspond to different battery chemistry or power configurations. Select the version that matches the nominal cell chemistry and finished-pack voltage; do not use an incorrect option with a different cell type.
Battery-Pack Integration
- Use a matched 4S battery pack with an appropriate external protection and balancing board. The module itself does not replace battery-cell balancing protection.
- Disconnect all power before soldering or wiring. Connect the main board positive and negative leads first, and complete the battery-pack negative connection last.
- Use wiring, connectors and fusing rated for the expected current. Inspect polarity before applying power.
- Battery percentage may not be accurate on first power-up and can stabilize after charge/discharge cycles; pack capacity and cell consistency affect the indication.
Package Scope and Notes
The package contains one module. Batteries, battery-protection board, enclosure, cables and soldering materials are selected separately. This is a project component for appropriately designed 4S battery systems, not a complete consumer power bank.
