Haven’t seen this mod anywhere yet so I figured I’d make a thread for it. Nothing incredible but it’s a very cheap and easy mod that makes life a little bit easier. All you need is a 12v step up. My original intention was to just add a usb charger, specifically a variable DC step up that has a micro usb charger on it. After spending a couple minute trying to find a good place to mount it I couldn’t and the idea came up to just use the existing one. Turns out the voltage in on the miniusb on the 7e isn’t even used, which explains why you need the battery to even turn it on for USB. So using the existing miniusb port has the added benefit of now being able to power the tx. No more battery needed for flashing and .ini edits. Now batteries go in and you charge it via USB for a year or two until the batteries go bad, no lipos, no balance charges, no moving or touching batteries, just plug it in to a USB port.
All you need is a 12v step up. You’re going to tap into the power coming off the miniusb on the main board. Positive will be the top pin that isn’t being used and it can be grounded with any of the joints to the main shell. 12v power will go into the charging port, the tabs are easy to solder to, positive voltage will go on the tab that connects to the white wire.
(Orange is positive and white is ground)