Using a 10s6p battery 30q and I want the most accurate battery % I can get since I’ll be getting a puck remote soon and that doesn’t show battery percentage unfortunately
I’m using Xmatics
Cell capacity is 3000. It’s asking per cell. Set the cell charge voltage to 4.20.
Ahhh ok thank you, but for my charge voltage it always says 42.3V when my battery is full, is that correct?
42v is healthier for the cell and due to the voltage curve the amount of extra capacity it gives is negligible.
There’s a very good chance your battery meter is not 100% accurate, meaning that extra .3v you see is actually not there. Most chargers for 10s simply stop at 42v. The other reason I could think of for the extra .3v( if it is there), would be adjustable pots on your charger. These allow the user to manually dictate what the charger outputs, hopefully you didn’t fiddle with knobs not knowing what they did 
If you have the time and knowhow stick your battery with a multimeter when it’s done charging so you know for sure.
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That’s a little high, as evywan and Sn4pz said. Anything above 4.20 is beyond the cell’s manufacturer rating, and will negatively affect the lifespan of the cells. You should adjust your charger if possible, or if not, add a diode in series to drop it down a hair.
The higher you charge (and the lower you discharge) a cell, the more wear you put on it. For this reason, I set my chargers to 4.1 or 4.15 volts/cell rather than 4.2, since I can afford to leave a few percent of capacity on the table in exchange for more cycles overall.
This is why electric cars like Tesla don’t charge all the way to 100%, or warn you when they’re getting close - The battery pack is the single most expensive piece of the vehicle, so anything you can do to make it last longer, you should do.
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Hope I don’t sound like know it all, They also degenerate at lower voltage as well lithium cells would last much longer if used within 20 and 80 % of their voltage range.
The charging I’m using is a 5 amp fast charger that I got from build kit boards. It doesn’t have any settings like that or anything it’s just like a plug in type and that’s it. But since I’m using 2 10s3p in parallel and charging them from 1 charger, I’m guessing it’s charging the packs at 2.5 amps?
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I mentioned multimeters to check the voltage of the charger/battery, not necessarily to measure its current output, I dont know shit about how electricity works 
To clarify with an example, my DaVeGa always gave a measurement of -X.5v, and I think your battery meter is suffering from the same thing, just in the opposite direction. Like I said its probably nothing to sweat over but you should check to make sure.
Yeah, I already covered that.