A 5V, 2.4A boost/charging board for a power bank is a printed circuit board (PCB) module that uses a single or parallel-connected lithium battery (like the 18650 type) to provide a 5V USB output.
Specifications
These modules feature a boost converter to step up the battery's voltage and a charging circuit, often including dual USB ports, with features like overcharge/overdischarge protection and high-current identification for faster charging.