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Yes 20 amps with them in parallel will give you 1c charge rate, at 10 they would be getting .5c charge rate

I'll pm a pic this weekend, It's just a DYS 3 axis w/8bit Basecam.

I purchased a pair of these. Super easy to modify, just have to float ground on one to use in series. http://www.ebay.com/itm/LOT-OF-2-Dell-PowerEdge-2950-750W-Power-Supply-Y8132-JU081-Z750P-00-N750P-S0-/271925732435

Have you tried charging the 4S at 1c without the parallel board directly to the charger? "So I'm going to need a 24V PS for the 6s aren't I?" Shouldn't be the case you will just be limited on max charge current. If you want to be able to charge at max output of that charger you will need at...

Are you parallel charging the packs?

18v should be plenty for the 4S, thought they were all 6S that you were having problems with.

18 volts ain't going to work. Maximum charge power capacity: 1000W (when >23V; 500W for 12V) Input voltage range: 4.5-38V DC

I can tell you that when I have only 8 sats compared to 12-14 sats, it's a big difference the way it holds position.:) Might try shielding the bottom of the gps puck, some seem to have had luck.

Only thing I see is your gps sat count is low on all your flights. Is this the way you have the gps now in the photo? If so I would raise it above the lipos and recalibrate the compass.

At least with my experience with the X, The rear motors will start tagging 99% in fast forward flight if your underpowered. @jwoike Try flying it in GPS mode at 100% forward flight. Mine holds perfect altitude in gps at 25kph. In atti mode when over 20kph, mine loses a little alt as forward...

Is it just me? I see 24 points of possible failure with those socket-ed bullet connectors in the arms.

Was referring to 3.3 volts per cell, you'd probably pulling more then the pack can handle if we are talking at the 80% mark. It's always good too, to have an IR thermometer close by to check pack temps after landing. Wouldn't want to see anything above 120 deg, but that's just my opinion.

This Lipo calculator gives cell and total voltage drop at different c ratings. http://www.soko-heli-tools.com/en/lipo-battery-calculator/lipo-battery-calculator.html

Maybe your not using a high enough c rated lipo.:):)

I fly 23.5 min to 5800 mah with my tattu 4S7000mah 600g , 24.5 min with rmrc 15 month old 4S8000mah at around 6600mah used, 730g. Multistar 10c 4S10000mah 27 min to 8000mah used, 801g. None of them below 3.65v. At about 3-4ms forward flight, i can get about a 1 amp increase in efficiency over...

Never lower then 3.6v per cell under load or 80% mah used which ever comes first. Correct way to know exactly is to use telemetry with current sensor w/radio or OSD. I have never hit 3.6v before the 80% mark.

From what i have seen others post, it's light years ahead. Never owned a dji fc.

I am using the small wire isolator with my Gopro gimbal. http://multirotorforums.com/threads/stratus-productions-wire-vibration-isolater.22388/ and replaced the compression dampener balls with 15x15x5mm silicone chips. http://www.vibrationmounts.com/Store.asp?Page=Products8.htm Here's a sample...

Can't tell from your photo, but you might try moving the receiver antenna's farther away from the gps. I have RC and VTX below the arms.