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"4.8V are pretty enough to have a stable operation of pixhawk. See here: 
http://ardupilot.org/copter/docs/common-powering-the-pixhawk.html?h...
i run one of my Copters with stable 4.6V without any issues (i.e. brownout).
powering the cheap China…"

"I fried also once a 4in1. Since then I use an additional capacitor on the power inlet pads 1000uF. Especiall if using 6S the voltage Spikes can destroy the esc. Never had issues afterwards. There are a lot of informations available in youtube i.e.…"

"Hello

I had also the accel health issue with 1 original Pixhawk and a clone as discribed in that threat.
Since I use an antispark plug on plus pole (waiting for about 5secs untill complete plugin) I haven't had this issue anymore with around 15…"