A 50/50 solution of hydrogen peroxide and white vinegar works great for leading and copper removal in firearm barrels. It melts that crap in seconds.
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I found this online:
Usually, both parallel and serial batteries drain almost equally. Parallel batteries have a better self-correction if they donāt drain equally than serial batteries.
Any differences caused in unequal drain is caused by a difference between the cells.
So the question really is, are your batteries of good quality, do you have this effect with different married packs? If the answer is yes, then this corrosion is very likely why they discharge at different rates.
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ok ive tried everthing and still this is
how it looks
im almost thinking its supposed to be so if snyone knows someone witb the same type please confirm i believe @JoJo may have one
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Iām thinking youāre missing a magnet at this point.
Perhaps it didnāt get drilled out deep enough, so they couldnāt put one in? 
/shrugs
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thats not a magnet , its flush as well but it is bugging me lol ( not completely flush )
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perhaps the pic? but looks as if u are missing a contact on left, not familiar w/ mod, not that it matters
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I looked it up, u can run it dual or single batt. Can u get it over 75 watts? if not u are missing a contact. Retrace your steps as u look on the ground 
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ill check that contact would have the be very then but ill test it
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i vacuum practically everyday so that would be very doubtful , but funny
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omg i just put batts in , crown top with a stock .25 coil and the ohms are reading .43 , i put watts up to 80 and its hitting hmmmmm, im going to try the single batt and see what that does , but the battery compartments dont dictate the ohm reading so i wonder if it a problem with circuit board
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not exactly sure when the board will say enuff is enuff
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Sounds like itās time to go mod shopping!
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ya i still have 3 aliens and a kbox120 i just opened a couple weeks ago so im ok , but yes you are right im also trying to hold off till black friday , i have a couple ive wanted for awhile , im always behind when it comes to hardware
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Iād have to agree with @Sprkslfly and @worm1, looks like a missing contact to me brother. Thatās unfortunate, but at least u have backups 
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i cant believe how thin that contact is and i think you guys are right i cant even scrape the black off , would the contact throw off the ohm readings as well ?
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vinegar or an eraser
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No brother, wut we r saying is that we donāt think itās a corroded contact but that the contact completely fell out. It appears to be gone IMO. Between all the cleaning methods we should be seeing some copper by now man, so I think it just fell out somewhere along the line.
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As for the ohm reading, no the contacts r just dealing with your batteries. The chip in the device handles the info it gets from the 510 pin and the contacts wouldnāt effect thatšš»
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No. Just affects the battery portion.
EDIT: WRONG! (to me: keep digging Sherlockā¦ Lol)
/edit
The impedance is read by the chipset, and goes through the ātop componentsā (to keep it simple)
Thatās a missing contact point. The material youāre seeing (trying to clean) is not oxidation. Itās the base material where the contact rests. =(
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Iām not sure what that is but I am pretty sure I donāt have one. I have evic VTC Minis, a WR, and a VT133. And an old Dovpo TC-50 that I donāt use. Looking at the first pic you posted, thereās definitely a piece missing and it looks like a chunk out of the metal/plastic on that side. Did it get dropped? Iām not an engineer by any stretch of the imagination, but it seems like itād make sense that itād cause some problems if it was broken.
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