I’m working on a project that will be battery or USB powered. The system load is 3.3V, so I’ll be running the input power sources through an LDO regulator. The battery will be a 110 mAh lithium polymer battery at ~3.7V. The design does have diodes on both inbound power sources leading up to the regulator, however, do I need to be concerned about leak current through the diode that will flow from the USB 5V source to the ~3.7V battery? I have attached a diagram to help illustrate the setup.