So I recently installed pretty much every module you can put on the F550, IOSD Mini, Can-Hub, Datalink and have been having absolute crap flight times . I literally get less that two minutes before the low voltage meter beeps at me but upon checking it shouldn't have hit that limit. I fly a 6400mah 3S nano-tech (506grams) battery at 100% and in two minutes it drops to something like 63%. Previously I was getting around 12 minutes flight time without these modules. Also I have the stock setup in terms of motors and am using 10inch props. I'm not to silly not to realise that obviously the modules would draw some power and the added weight would effect flight times but this is ridiculous. I'm assuming I have a faulty module? Also just plugged in the battery before and it was flashing red repeatedly from the naza, disconnected battery and tried again, no problem and startup sequence initialised but as soon as I was in the air I got the low voltage warning once again. You guys are awesome and would love your input. I literally have no idea what's going on... Voltage levels as shown below. They were working normally before the modules were added on and upon landing I'd have 25% left in my battery. UPDATE: F550 with GoPro, battery and all modules attached is 2.1kg's F550 with GoPro, without batteries and all modules attached is 1.6kg's.