HW-357 Battery Charger With Step Up Voltage Converter

The HW-357 combines two functions that are normally handled by separate modules: it charges a connected battery (typically a single-cell lithium battery) from an external input, and it also includes an integrated step-up (boost) converter to raise that battery’s voltage back up to a stable, usable output level for powering a device – the same core idea behind a basic power bank, packed onto one small board.

This kind of combined charge-and-boost design is popular in portable, battery-powered DIY builds because it removes the need to wire together a separate charging module and a separate boost converter, reducing both part count and wiring complexity. It’s a practical building block for projects that need to run from a rechargeable battery while still delivering a steady, higher output voltage to the rest of the circuit.

1. Model: HW-357
2. Combines battery charging and voltage step-up (boost) in one module
3. Simplifies portable/rechargeable project design
4. Reduces part count versus separate charger + boost modules
5. Common use: DIY power banks, portable battery-powered electronics
6. Compact module footprint