Hey guys! Just a couple things before I get started: first, I also posted this over on the DJI forum. I decided to post it over here as well because I don't seem to get a whole lot of replies over there, and I thought it's never bad to get a second opinion. Also, I actually have a phantom 2, but all of my issues should also apply to the phantom 3, I just thought there is probably minimum traffic on the P2 forums these days. Alright, here goes! I haven't flown my phantom in a good solid 2 months, it's just sort of sat in its case. Anyhow, I needed to use it for something tonight, so I pulled it out. I started it, took it off as I nomally would, and the flight seemed to be fine. However, after about 30 seconds, the red lights started flashing rapidly on the drone, and I was like; "LOW BATTERY?!?! That battery said that it was full 30 seconds ago!" So I just assumed that it was the auto discharge feature built into the batteries, so I charged up the battery and tried again, and the same thing happened. I tried a different battery, and the same thing happened, then I tried a third, and that one seemed to be good, but after about 5 minutes of flying it did the same thing. I tried using my second charger, only to get the same results. I should also note that a couple hours after this flight, the batteries show that they have almost a full charge, even though I'd discharged them to what the had said was "16%" before, so it seems more that it thinks that the battery is draining faster than it actually is. I've talked to DJI service reps, and done a ton of research. I've tried a few things to attempt to fix the batteries. Here is what I've tried: -Depleting batteries to less than 8% then charging them all the way up to 100%. -Doing an advanced IMU cali. -I've tried batteries on both chargers, and seen no pattern there. I have 2 batteries that work well, and 4 that are terrible. It's extremely frustrating seeing that I can't seem to solve the issue. Is it possible that ALL FOUR batteries just quit? That's almost $500 in losses, suuuuuper frustrating. Also, do you guys think that the DJI service people could maybe repair the batteries somehow? Or maybe even me? The guys at DJI told me to reinstall the battery firmware. They said I could find a download and instructions online, but I don't think it's something that's possible. Is this something you guys have heard of? So in summary, I've tried everything that I can find to try online. I've called the DJI service reps, and they can't really seem to shine any light onto the situation. It seems to be more of a problem with the batteries than the craft also. So here's what I need you guys to tell me: -Should I try sending it in to DJI? If so, what are your experiences with the wait times there? -Have you ever heard of reinstalling the battery firmware? If this is possible could you please tell me how to do it? -Do you think that four of my six batteries are just simply dead? Thank you for all the help.