Canon's website indicates that you can charge the battery for a PowerShot SX740 HS while in the camera using an interface cable and a compact power supply. I have not been able to get this to work. The cable will connect to the computer and allow me access to the pictures and charge the battery so I know the cable works with the camera.
link to instructions on charging battery while in the camera follows:
https://support.usa.canon.com/kb/index?page=content&id=ART171225
