Im charging my 3s 550mah lipos to 4.2v, flying them down to around 10.5v then when i put them back on to charge they are all reading 3.7/3.8v, varies across each cell, but pretty much the same for all six batteries. Am i not getting the full use out of them? Shouldnt they be reading around 3.5? Is it something to do with betaflight? Wasnt the easiest question to ask google 
The charger that im using is the hota D6. The quad i have is betafpv pavo 20 pro and im using the dji fpv rc3 and goggles 3. Also what is the appropriate discharge rate for rhis type of lipo? The hota defaults to 0.2a is this alright?
The offload voltage will be higher than when under load flying, so once you land the voltage tends to go back up a bit
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It’s the internal resistance of the cell effect, the more load the more the voltage sags, with no load the voltage comes back up.
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@Steviegeek has put it perfectly.
There is alot to learn about this hobby, even if just flying dji type camera drones. When you put selfbuild anf FPV into the equation it multiplys exponentially.
All my chargers discharge at around .5A - 1A as default. This is down to the perfect charge / discharge rate for a battery is 1C.
The reason for a low discharge rate is to not put too much strain on the batteries to help maintain good battery health.
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Ive read oscar liang article cheers Wayne. Im withought my computer for a few days now and i left the multimeter i bought recently back at mine. I know from other users reviews that they are only getting a handful of minutes from this quad/battery combo if that anyways. I might set a timer and see how long they last to 10.5 ish volts.
I understand theres a bit of bounce back in voltage but thought that was just while flying. 
And thanks about the discharge rates. I could probably come up a bit from 0.2 when discharging now.
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Ive been out flying again today and timed 3 runs out of 6 batteries. All around 4.5 mintues. Flown to exactly 10.5v after some bounce back from 10.3/10.4. Im not exactly pushing the quad but at the same time im not just floating about and hoovering. Got back and plug a few batteries into the charger and im getting readings from 3.78 to 3.84 across all batteries. Is this normal? As soon as im back at mine i can see how ive setup betaflight as that might be the solution. On side note, if i am getting readings like rhis after 4/5 mins of usage, are they at good storage voltage? So i dont really need to discharge them anyways. Woukd still like to get abit more flight time out of them though. Think ive been spoilt by the avata2!
Thats about standard. I get longer on the explorer, much less on my 5 inch with three bladed props, whoop can get about 2 mins… Depends upon how low you fly down the voltage.
See: Polls: All things LiPo ... Min/Warning Cell Voltage & Charging C & Parallel Charging
IMHO down to ~3.8v is good, no discharge needed. Especially if you not parallel charging.
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Nope no parallel chargeing, cheers brendan. Ill take a look
You’re actually far better measuring the mAhr used. I’m not sure if BF allows you to show this in the OSD ? @bmsleight ? (INAV does) and then you can fly as long as it takes to use the charge. Not totally, you want to land by 80% used so for a 1500mAhr battery have it on the ground by 1200
Your charger will confirm what you have used when you charge it back up
HOWEVER for this method to work you must have your current calibration good, worth it as it’s a much better method to manage your batteries
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It does - I normally have this on, useful reference.
But I dont take too much care of my batteries…
Sacha - lands when it starts to feel the sag (2.7v …)