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Green rectangular circuit board with USB-C and microUSB ports, screw terminals and 4S label

KEHIPI

KEHIPI 4S BMS Power Adapter 4.5V-15V 18W 2A

SKU CH-R40G-YRAQB

Charges 4S lithium packs at up to 18 W via USB-C or micro-USB with QC fast-charge support and thermal protection

  • Color4S
  • Type-C and microUSB inputs let you power the module from common USB chargers
  • Supports QC fast charging protocol for quicker battery top-ups
  • Direct-wire IN+ and IN- terminals accept 4.5 V to 15 V sources for flexible integration
  • Operates reliably from -20 °C to 85 °C in harsh environments
  • Delivers up to 18 W of buck-boost charging for 4S lithium packs

BMS adapter for 4-cell lithium packs

This KEHIPI module manages charging for 4S lithium batteries using a 4.5 V to 15 V input range. It delivers up to 18 W with a 2 A output limit and includes temperature protection across a -20 °C to 85 °C operating window. The board suits hobbyists building custom packs or repairing portable devices.

Verify cell count and input source before ordering

Confirm your pack uses exactly four series cells, as the BMS is configured for 4S topology only. Ensure your USB power supply can provide the required voltage and supports the QC fast-charge protocol for the default 12 V or 9 V modes. Direct wiring to the IN+ and IN- pads is an alternative if USB cables are not used.

Compact board with three power-input options

The module offers USB Type-C, micro USB and direct solder pads for flexible integration into tight enclosures. A solder jumper selects the fast-charge default voltage without extra components. Broad temperature tolerance and on-board protection suit demanding environments where space and reliability matter.

Highlights

  • Type-C and microUSB inputs let you power the module from common USB chargers
  • Supports QC fast charging protocol for quicker battery top-ups
  • Direct-wire IN+ and IN- terminals accept 4.5 V to 15 V sources for flexible integration
  • Operates reliably from -20 °C to 85 °C in harsh environments
  • Delivers up to 18 W of buck-boost charging for 4S lithium packs

Specifications

BrandAITRIP
Color4S

Questions about this item

What comes in the box and do I need any extra cables for the Type-C or microUSB inputs?

The package contains three 4S BMS charging modules. Each board has Type-C and microUSB ports for USB charging cables, plus IN+ and IN- pads for direct wiring, so you only need a suitable USB cable or hook-up wire depending on how you plan to power it.

The listing mentions 2S, 3S, 4S and 5S versions — which one should I pick for a four-cell lithium pack?

Choose the 4S version; it is factory-set for a four-series lithium battery and handles the 4.5 V to 15 V input range with the 18 W maximum charge rate.

What does the 18 W figure mean when the board is installed in my project?

It is the peak charging power the module can deliver to the battery pack when the input supply supports QC fast charge at 12 V (or 9 V after the red-box short), limited by the 2 A current capability and the 20 °C to 85 °C operating temperature window.

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