Went for a quick flight around my house this evening. On power up, had constant flashing red, so I restarted the battery, and everything seemed okay. Shortly after departure, I got a Battery MCU failure (if memory serves) and then it cleared. BTW, I'm using DJI Ultimate Flight as the app. I got up to around 500' (my goal for this flight) and about 1500' out and noticed that my battery was dropping very quick. I went into emergency mode and got her back and hand-landed at exactly 1% indicated. At one point I hit -12.9 mph vertical speed at 22 mph in a sharp spiral over my house. Sustain: Any flight that lands safely is a good flight. Maintained LOS at all times. Improves: Don't discount errors. It's probably telling you something. When the DJI Ultimate Flight is updated, your settings (like tracks) are defaulted! (Grrrr, lost that data).