Currently I can upload sketches to the Pro Mini using my UNO (without chip). I plan to have the Pro Mini run on battery, in a sealed enclosure and be able to upload sketches too. The problem is how to do it while it's running on battery? I only connected the TX, RX, RST & Gnd (not the Vcc), to my UNO but I can't upload sketches.
I'm not sure if it's possible or I'm missing a connection, but is it possible to program the mini while it's on a battery (if so how?)